Hello everyone,
I'm runnning 2.6.20.3 patched with -rt8 (and glibc 2.3.6).
http://people.redhat.com/mingo/realtime-preempt/older/patch-2.6.20-rt8
I've written a program to highlight a phenomenon I don't understand.
This system includes a PCI board that provides data at ~38 Mbit/s.
I request data in lumps of 1316 bytes.
In other words, a new request should complete every 277 µs.
However, if I time stamp each packet as soon as I receive it, I notice
that almost exactly every 2 seconds, the packet is received 30-100
microseconds late.
(The system is otherwise idle while I run my test.)
Now, I know that this is not a hard real-time system, so it's not the
delay per se that I find confusing. What I don't understand, is why the
delay happens periodically.
My application runs as a SCHED_RR task with priority 80. As far as I
understand, this is even higher priority than the softirq handlers.
Is there something with an even higher priority that could delay the
delivery of my data?
The other possibility is that the delivery of the data itself is
delayed. I don't understand PCI and DMA. Is it possible that the DMA
request is delayed by something?
I've provided my test case. cf strange_delays.cxx
I've also provided the output of a long run of the test case.
The driver source code is available here:
http://www.dektec.com/Products/LinuxSDK/Downloads/LinuxSDK.zip
AFAIU, they use DMA to transfer data from the board's SDRAM to my
system's RAM.
Regards.
#include <ctime>
#include <cstdio>
#include <sched.h> // sched_setscheduler
#include <asm/msr.h>
#include "DTAPI.h"
#define BUFFER_SIZE (188*7)
#define CPU_MHZ 1266.794
#define US_DELAY 40
double us_period = 0;
static void set_SCHED_RR()
{
struct sched_param param = { 0 };
param.sched_priority = 80;
if (sched_setscheduler(0, SCHED_RR, ¶m) != 0) perror("SCHED_RR");
}
static void init_hardware(DtDevice& Dev, TsInpChannel& TsIn)
{
int rate = 0;
DTAPI_RESULT res;
res = Dev.AttachToType(140);
if (res != DTAPI_OK) printf("AttachToType: %lu\n", res);
res = TsIn.Attach(&Dev);
if (res != DTAPI_OK) printf("Attach: %lu\n", res);
res = TsIn.GetTsRateBps(rate);
if (res != DTAPI_OK) printf("GetTsRateBps: %lu\n", res);
printf("INCOMING RATE = %d bit/s\n", rate);
us_period = 8e6*BUFFER_SIZE / rate;
printf("EXPECTED PERIOD = %f µs\n", us_period);
res = TsIn.SetRxMode(DTAPI_RXMODE_ST188);
if (res != DTAPI_OK) printf("SetRxMode: %lu\n", res);
res = TsIn.SetRxControl(DTAPI_RXCTRL_RCV);
if (res != DTAPI_OK) printf("SetRxControl: %lu\n", res);
}
int main(void)
{
char buf[BUFFER_SIZE];
DtDevice Dev;
TsInpChannel TsIn;
set_SCHED_RR();
init_hardware(Dev, TsIn);
unsigned prev_tsc, curr_tsc;
struct timespec prev_spec, curr_spec, last_spec;
for (int i=0; i< 20; ++i) clock_gettime(CLOCK_MONOTONIC, &prev_spec);
TsIn.Read(buf, sizeof buf);
rdtscl(prev_tsc);
clock_gettime(CLOCK_MONOTONIC, &prev_spec);
last_spec = prev_spec;
while ( 1 )
{
TsIn.Read(buf, sizeof buf);
rdtscl(curr_tsc);
clock_gettime(CLOCK_MONOTONIC, &curr_spec);
double tsc_usdiff = (curr_tsc - prev_tsc) / CPU_MHZ;
double spec_usdiff = (curr_spec.tv_sec-prev_spec.tv_sec)*1e6 + (curr_spec.tv_nsec-prev_spec.tv_nsec)/1e3;
if (spec_usdiff > us_period+US_DELAY)
{
printf("NOW=%ld.%09ld\n", curr_spec.tv_sec, curr_spec.tv_nsec);
double temp = (curr_spec.tv_sec-last_spec.tv_sec) + (curr_spec.tv_nsec-last_spec.tv_nsec)/1e9;
last_spec = curr_spec;
printf("LAST: %f s\n", temp);
printf("CLOCK: %f µs\n", spec_usdiff);
}
if (tsc_usdiff > us_period+US_DELAY)
{
printf("TSC: %f µs\n", tsc_usdiff);
puts("+++++");
}
prev_tsc = curr_tsc;
prev_spec = curr_spec;
}
return 0;
}
root@SEND:~# ./testDT
INCOMING RATE = 38014635 bit/s
EXPECTED PERIOD = 276.945971 µs
NOW=1666.120122929
LAST: 0.555567 s
CLOCK: 367.129000 µs
TSC: 367.082572 µs
+++++
NOW=1668.090123211
LAST: 1.970000 s
CLOCK: 334.835000 µs
TSC: 334.804238 µs
+++++
NOW=1670.160123151
LAST: 2.070000 s
CLOCK: 335.609000 µs
TSC: 335.535217 µs
+++++
NOW=1674.120122451
LAST: 3.959999 s
CLOCK: 334.091000 µs
TSC: 334.003003 µs
+++++
NOW=1678.090121455
LAST: 3.969999 s
CLOCK: 361.673000 µs
TSC: 361.624700 µs
+++++
NOW=1680.160122488
LAST: 2.070001 s
CLOCK: 363.477000 µs
TSC: 363.429255 µs
+++++
NOW=1684.120123378
LAST: 3.960001 s
CLOCK: 363.449000 µs
TSC: 363.394522 µs
+++++
NOW=1685.191517226
LAST: 1.071394 s
CLOCK: 340.397000 µs
TSC: 340.393150 µs
+++++
NOW=1685.192610458
LAST: 0.001093 s
CLOCK: 325.702000 µs
TSC: 325.719888 µs
+++++
NOW=1685.193446243
LAST: 0.000836 s
CLOCK: 330.233000 µs
TSC: 330.311006 µs
+++++
NOW=1685.195118349
LAST: 0.001672 s
CLOCK: 342.856000 µs
TSC: 342.837904 µs
+++++
NOW=1685.195948913
LAST: 0.000831 s
CLOCK: 340.441000 µs
TSC: 340.427094 µs
+++++
NOW=1685.201210116
LAST: 0.005261 s
CLOCK: 340.938000 µs
TSC: 340.928359 µs
+++++
NOW=1685.202303271
LAST: 0.001093 s
CLOCK: 327.605000 µs
TSC: 327.615224 µs
+++++
NOW=1685.205362027
LAST: 0.003059 s
CLOCK: 340.357000 µs
TSC: 340.345786 µs
+++++
NOW=1685.206455332
LAST: 0.001093 s
CLOCK: 324.288000 µs
TSC: 324.295031 µs
+++++
NOW=1685.212833345
LAST: 0.006378 s
CLOCK: 333.487000 µs
TSC: 333.492265 µs
+++++
NOW=1685.213926684
LAST: 0.001093 s
CLOCK: 318.932000 µs
TSC: 318.938201 µs
+++++
NOW=1685.214505746
LAST: 0.000579 s
CLOCK: 333.171000 µs
TSC: 333.258604 µs
+++++
NOW=1685.216433536
LAST: 0.001928 s
CLOCK: 333.743000 µs
TSC: 333.723557 µs
+++++
NOW=1685.220848453
LAST: 0.004415 s
CLOCK: 318.938000 µs
TSC: 318.891627 µs
+++++
NOW=1685.222813290
LAST: 0.001965 s
CLOCK: 345.159000 µs
TSC: 345.141357 µs
+++++
NOW=1685.223905947
LAST: 0.001093 s
CLOCK: 330.277000 µs
TSC: 330.273115 µs
+++++
NOW=1685.225833823
LAST: 0.001928 s
CLOCK: 318.322000 µs
TSC: 318.310633 µs
+++++
NOW=1685.231376727
LAST: 0.005543 s
CLOCK: 323.892000 µs
TSC: 323.894808 µs
+++++
NOW=1685.234142203
LAST: 0.002765 s
CLOCK: 319.118000 µs
TSC: 319.126077 µs
+++++
NOW=1686.090122357
LAST: 0.855980 s
CLOCK: 331.238000 µs
TSC: 331.177761 µs
+++++
NOW=1688.160123287
LAST: 2.070001 s
CLOCK: 331.995000 µs
TSC: 331.955314 µs
+++++
NOW=1692.120123368
LAST: 3.960000 s
CLOCK: 330.912000 µs
TSC: 330.865160 µs
+++++
NOW=1696.090121892
LAST: 3.969999 s
CLOCK: 359.348000 µs
TSC: 359.272305 µs
+++++
NOW=1698.160121646
LAST: 2.070000 s
CLOCK: 358.589000 µs
TSC: 358.531853 µs
+++++
NOW=1702.120122383
LAST: 3.960001 s
CLOCK: 358.541000 µs
TSC: 358.492383 µs
+++++
NOW=1704.090122974
LAST: 1.970001 s
CLOCK: 327.748000 µs
TSC: 327.659430 µs
+++++
NOW=1706.160122441
LAST: 2.069999 s
CLOCK: 326.747000 µs
TSC: 326.706631 µs
+++++
NOW=1710.120123557
LAST: 3.960001 s
CLOCK: 325.793000 µs
TSC: 325.757779 µs
+++++
NOW=1714.090122247
LAST: 3.969999 s
CLOCK: 355.158000 µs
TSC: 355.067201 µs
+++++
NOW=1715.191685988
LAST: 1.101564 s
CLOCK: 317.896000 µs
TSC: 317.830681 µs
+++++
NOW=1716.160122015
LAST: 0.968436 s
CLOCK: 355.047000 µs
TSC: 355.003260 µs
+++++
NOW=1720.120121988
LAST: 3.960000 s
CLOCK: 353.483000 µs
TSC: 353.449732 µs
+++++
NOW=1720.187956278
LAST: 0.067834 s
CLOCK: 342.370000 µs
TSC: 342.283749 µs
+++++
NOW=1720.189415938
LAST: 0.001460 s
CLOCK: 415.925000 µs
TSC: 415.806358 µs
+++++
NOW=1720.192956331
LAST: 0.003540 s
CLOCK: 356.406000 µs
TSC: 356.272606 µs
+++++
NOW=1720.197653223
LAST: 0.004697 s
CLOCK: 346.931000 µs
TSC: 346.874867 µs
+++++
NOW=1720.198317781
LAST: 0.000665 s
CLOCK: 456.076000 µs
TSC: 456.134147 µs
+++++
NOW=1720.218743715
LAST: 0.020426 s
CLOCK: 389.993000 µs
TSC: 389.881070 µs
+++++
NOW=1720.232527110
LAST: 0.013783 s
CLOCK: 327.039000 µs
TSC: 327.012127 µs
+++++
NOW=1720.235585559
LAST: 0.003058 s
CLOCK: 339.401000 µs
TSC: 339.382725 µs
+++++
NOW=1722.090122182
LAST: 1.854537 s
CLOCK: 321.382000 µs
TSC: 321.296912 µs
+++++
NOW=1724.160130560
LAST: 2.070008 s
CLOCK: 329.502000 µs
TSC: 329.440304 µs
+++++
NOW=1728.120122106
LAST: 3.959992 s
CLOCK: 321.359000 µs
TSC: 321.311121 µs
+++++
NOW=1730.120127010
LAST: 2.000005 s
CLOCK: 387.895000 µs
TSC: 387.853905 µs
+++++
NOW=1732.090122917
LAST: 1.969996 s
CLOCK: 352.475000 µs
TSC: 352.386418 µs
+++++
NOW=1734.160122358
LAST: 2.069999 s
CLOCK: 349.973000 µs
TSC: 349.884038 µs
+++++
NOW=1738.120122212
LAST: 3.960000 s
CLOCK: 350.231000 µs
TSC: 350.178482 µs
+++++
NOW=1740.090122859
LAST: 1.970001 s
CLOCK: 319.788000 µs
TSC: 319.739437 µs
+++++
NOW=1742.090126733
LAST: 2.000004 s
CLOCK: 383.387000 µs
TSC: 383.297521 µs
+++++
NOW=1742.160121976
LAST: 0.069995 s
CLOCK: 318.684000 µs
TSC: 318.596394 µs
+++++
NOW=1744.160127139
LAST: 2.000005 s
CLOCK: 384.691000 µs
TSC: 384.649754 µs
+++++
NOW=1746.120122445
LAST: 1.959995 s
CLOCK: 318.163000 µs
TSC: 318.114863 µs
+++++
NOW=1748.120127187
LAST: 2.000005 s
CLOCK: 383.782000 µs
TSC: 383.724583 µs
+++++
NOW=1750.090122127
LAST: 1.969995 s
CLOCK: 346.185000 µs
TSC: 346.137572 µs
+++++
NOW=1752.160122295
LAST: 2.070000 s
CLOCK: 345.982000 µs
TSC: 345.918121 µs
+++++
NOW=1756.120121978
LAST: 3.960000 s
CLOCK: 346.185000 µs
TSC: 346.128100 µs
+++++
NOW=1760.090127929
LAST: 3.970006 s
CLOCK: 381.758000 µs
TSC: 381.693472 µs
+++++
NOW=1762.160127932
LAST: 2.070000 s
CLOCK: 380.056000 µs
TSC: 380.002589 µs
+++++
NOW=1766.120127556
LAST: 3.960000 s
CLOCK: 380.118000 µs
TSC: 380.027850 µs
+++++
NOW=1768.090121866
LAST: 1.969994 s
CLOCK: 341.860000 µs
TSC: 341.819586 µs
+++++
NOW=1770.160121781
LAST: 2.070000 s
CLOCK: 341.433000 µs
TSC: 341.375156 µs
+++++
NOW=1774.120123841
LAST: 3.960002 s
CLOCK: 343.805000 µs
TSC: 343.716500 µs
+++++
NOW=1778.090127807
LAST: 3.970004 s
CLOCK: 377.467000 µs
TSC: 377.403114 µs
+++++
NOW=1780.160127605
LAST: 2.070000 s
CLOCK: 375.649000 µs
TSC: 375.582770 µs
+++++
NOW=1784.120128708
LAST: 3.960001 s
CLOCK: 376.853000 µs
TSC: 376.796069 µs
+++++
NOW=1786.090125978
LAST: 1.969997 s
CLOCK: 343.319000 µs
TSC: 343.227076 µs
+++++
NOW=1788.160125049
LAST: 2.069999 s
CLOCK: 340.543000 µs
TSC: 340.484720 µs
+++++
NOW=1792.120125960
LAST: 3.960001 s
CLOCK: 340.299000 µs
TSC: 340.254217 µs
+++++
NOW=1796.090123335
LAST: 3.969997 s
CLOCK: 369.100000 µs
TSC: 369.035534 µs
+++++
NOW=1798.160128083
LAST: 2.070005 s
CLOCK: 371.975000 µs
TSC: 371.927875 µs
+++++
NOW=1802.120121956
LAST: 3.959994 s
CLOCK: 366.443000 µs
TSC: 366.402114 µs
+++++
NOW=1804.090122577
LAST: 1.970001 s
CLOCK: 334.571000 µs
TSC: 334.474271 µs
+++++
NOW=1806.160121338
LAST: 2.069999 s
CLOCK: 332.673000 µs
TSC: 332.627089 µs
+++++
NOW=1810.120122596
LAST: 3.960001 s
CLOCK: 334.326000 µs
TSC: 334.297447 µs
+++++
NOW=1814.090122300
LAST: 3.970000 s
CLOCK: 362.736000 µs
TSC: 362.699855 µs
+++++
NOW=1816.160121711
LAST: 2.069999 s
CLOCK: 361.687000 µs
TSC: 361.634962 µs
+++++
NOW=1820.120122921
LAST: 3.960001 s
CLOCK: 361.910000 µs
TSC: 361.862308 µs
+++++
NOW=1822.090122871
LAST: 1.970000 s
CLOCK: 330.282000 µs
TSC: 330.193386 µs
+++++
NOW=1824.160122395
LAST: 2.070000 s
CLOCK: 329.787000 µs
TSC: 329.730801 µs
+++++
NOW=1828.120121649
LAST: 3.959999 s
CLOCK: 327.519000 µs
TSC: 327.483395 µs
+++++
NOW=1832.090122094
LAST: 3.970000 s
CLOCK: 358.341000 µs
TSC: 358.289509 µs
+++++
NOW=1834.160121416
LAST: 2.069999 s
CLOCK: 358.616000 µs
TSC: 358.572112 µs
+++++
NOW=1838.120121708
LAST: 3.960000 s
CLOCK: 357.956000 µs
TSC: 357.920072 µs
+++++
NOW=1840.090121749
LAST: 1.970000 s
CLOCK: 326.833000 µs
TSC: 326.760310 µs
+++++
NOW=1842.160122763
LAST: 2.070001 s
CLOCK: 327.312000 µs
TSC: 327.261575 µs
+++++
NOW=1846.120123922
LAST: 3.960001 s
CLOCK: 326.125000 µs
TSC: 326.093272 µs
+++++
NOW=1850.090123129
LAST: 3.969999 s
CLOCK: 356.491000 µs
TSC: 356.453378 µs
+++++
NOW=1852.160121498
LAST: 2.069998 s
CLOCK: 354.432000 µs
TSC: 354.395427 µs
+++++
NOW=1856.120121477
LAST: 3.960000 s
CLOCK: 352.402000 µs
TSC: 352.313004 µs
+++++
NOW=1858.090123534
LAST: 1.970002 s
CLOCK: 322.080000 µs
TSC: 321.997894 µs
+++++
NOW=1860.160123827
LAST: 2.070000 s
CLOCK: 323.990000 µs
TSC: 323.917701 µs
+++++
NOW=1864.120121735
LAST: 3.959998 s
CLOCK: 319.928000 µs
TSC: 319.871266 µs
+++++
NOW=1868.090122222
LAST: 3.970000 s
CLOCK: 351.742000 µs
TSC: 351.698066 µs
+++++
NOW=1870.160121758
LAST: 2.070000 s
CLOCK: 349.349000 µs
TSC: 349.322779 µs
+++++
NOW=1873.300127947
LAST: 3.140006 s
CLOCK: 324.076000 µs
TSC: 323.946908 µs
+++++
NOW=1874.120122758
LAST: 0.819995 s
CLOCK: 350.780000 µs
TSC: 350.720796 µs
+++++
NOW=1876.090121470
LAST: 1.969999 s
CLOCK: 318.294000 µs
TSC: 318.208801 µs
+++++
NOW=1878.090126176
LAST: 2.000005 s
CLOCK: 382.688000 µs
TSC: 382.630483 µs
+++++
NOW=1878.160122361
LAST: 0.069996 s
CLOCK: 318.850000 µs
TSC: 318.770850 µs
+++++
NOW=1880.160127058
LAST: 2.000005 s
CLOCK: 384.580000 µs
TSC: 384.521872 µs
+++++
NOW=1882.120122004
LAST: 1.959995 s
CLOCK: 317.635000 µs
TSC: 317.585180 µs
+++++
NOW=1884.120126690
LAST: 2.000005 s
CLOCK: 381.658000 µs
TSC: 381.613743 µs
+++++
NOW=1886.090122584
LAST: 1.969996 s
CLOCK: 347.806000 µs
TSC: 347.731360 µs
+++++
NOW=1888.160122190
LAST: 2.070000 s
CLOCK: 346.916000 µs
TSC: 346.851185 µs
+++++
NOW=1892.120122420
LAST: 3.960000 s
CLOCK: 345.036000 µs
TSC: 344.978742 µs
+++++
NOW=1896.090127276
LAST: 3.970005 s
CLOCK: 381.048000 µs
TSC: 380.973544 µs
+++++
NOW=1898.160126913
LAST: 2.070000 s
CLOCK: 380.192000 µs
TSC: 380.127314 µs
+++++
NOW=1902.120126914
LAST: 3.960000 s
CLOCK: 379.271000 µs
TSC: 379.193460 µs
+++++
NOW=1904.090122092
LAST: 1.969995 s
CLOCK: 343.269000 µs
TSC: 343.222339 µs
+++++
NOW=1906.160123954
LAST: 2.070002 s
CLOCK: 344.804000 µs
TSC: 344.761658 µs
+++++
NOW=1910.120122069
LAST: 3.959998 s
CLOCK: 340.510000 µs
TSC: 340.444461 µs
+++++
NOW=1914.090127781
LAST: 3.970006 s
CLOCK: 376.229000 µs
TSC: 376.162186 µs
+++++
NOW=1916.160128205
LAST: 2.070000 s
CLOCK: 376.150000 µs
TSC: 376.085615 µs
+++++
NOW=1920.120127752
LAST: 3.960000 s
CLOCK: 374.878000 µs
TSC: 374.825741 µs
+++++
NOW=1922.090126083
LAST: 1.969998 s
CLOCK: 342.914000 µs
TSC: 342.866322 µs
+++++
NOW=1924.160126442
LAST: 2.070000 s
CLOCK: 343.080000 µs
TSC: 343.027359 µs
+++++
NOW=1928.120127491
LAST: 3.960001 s
CLOCK: 342.900000 µs
TSC: 342.841851 µs
+++++
NOW=1932.090122549
LAST: 3.969995 s
CLOCK: 368.473000 µs
TSC: 368.400071 µs
+++++
NOW=1934.160128106
LAST: 2.070006 s
CLOCK: 371.852000 µs
TSC: 371.796046 µs
+++++
NOW=1938.120121962
LAST: 3.959994 s
CLOCK: 364.932000 µs
TSC: 364.884898 µs
+++++
NOW=1940.090122110
LAST: 1.970000 s
CLOCK: 335.255000 µs
TSC: 335.176043 µs
+++++
NOW=1942.160122610
LAST: 2.070000 s
CLOCK: 335.332000 µs
TSC: 335.283400 µs
+++++
NOW=1946.120122338
LAST: 3.960000 s
CLOCK: 332.694000 µs
TSC: 332.642087 µs
+++++
NOW=1950.090121848
LAST: 3.970000 s
CLOCK: 363.514000 µs
TSC: 363.486092 µs
+++++
NOW=1952.160122097
LAST: 2.070000 s
CLOCK: 361.869000 µs
TSC: 361.824417 µs
+++++
NOW=1956.120121762
LAST: 3.960000 s
CLOCK: 361.824000 µs
TSC: 361.772317 µs
+++++
NOW=1958.090121866
LAST: 1.970000 s
CLOCK: 330.843000 µs
TSC: 330.802798 µs
+++++
NOW=1960.160121967
LAST: 2.070000 s
CLOCK: 329.076000 µs
TSC: 329.040870 µs
+++++
NOW=1964.120122585
LAST: 3.960001 s
CLOCK: 328.850000 µs
TSC: 328.807209 µs
+++++
NOW=1968.090122545
LAST: 3.970000 s
CLOCK: 360.024000 µs
TSC: 359.948816 µs
+++++
NOW=1970.160122226
LAST: 2.070000 s
CLOCK: 357.739000 µs
TSC: 357.691937 µs
+++++
NOW=1974.120122583
LAST: 3.960000 s
CLOCK: 358.642000 µs
TSC: 358.595004 µs
+++++
NOW=1976.090122186
LAST: 1.970000 s
CLOCK: 327.077000 µs
TSC: 326.990024 µs
+++++
NOW=1978.160121775
LAST: 2.070000 s
CLOCK: 324.884000 µs
TSC: 324.843660 µs
+++++
NOW=1982.120122656
LAST: 3.960001 s
CLOCK: 324.800000 µs
TSC: 324.742618 µs
+++++
NOW=1986.090121501
LAST: 3.969999 s
CLOCK: 354.848000 µs
TSC: 354.795649 µs
+++++
NOW=1988.160122082
LAST: 2.070001 s
CLOCK: 354.940000 µs
TSC: 354.881693 µs
+++++
NOW=1992.120121909
LAST: 3.960000 s
CLOCK: 353.775000 µs
TSC: 353.703128 µs
+++++
NOW=1994.090122897
LAST: 1.970001 s
CLOCK: 323.582000 µs
TSC: 323.510373 µs
+++++
NOW=1996.160122903
LAST: 2.070000 s
CLOCK: 321.960000 µs
TSC: 321.907114 µs
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NOW=2000.120122840
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NOW=2004.090121920
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NOW=2006.160122180
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NOW=2010.120121540
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NOW=2012.090124280
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NOW=2014.090127024
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NOW=2016.160127610
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NOW=2018.120122519
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NOW=2020.120126831
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NOW=2100.120131481
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NOW=2150.090126482
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NOW=2152.160128192
LAST: 2.070002 s
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LAST: 3.959999 s
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NOW=2158.090121997
LAST: 1.969995 s
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NOW=2160.160122440
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NOW=2164.120122407
LAST: 3.960000 s
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NOW=2168.090126618
LAST: 3.970004 s
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LAST: 2.070000 s
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NOW=2174.120128092
LAST: 3.960001 s
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NOW=2176.090123009
LAST: 1.969995 s
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NOW=2178.160124020
LAST: 2.070001 s
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NOW=2182.120124435
LAST: 3.960000 s
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NOW=2186.090127466
LAST: 3.970003 s
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LAST: 2.070000 s
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NOW=2192.120127347
LAST: 3.960000 s
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NOW=2194.090126029
LAST: 1.969999 s
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NOW=2196.160126484
LAST: 2.070000 s
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NOW=2200.120122779
LAST: 3.959996 s
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NOW=2204.090122370
LAST: 3.970000 s
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LAST: 2.070000 s
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LAST: 3.960000 s
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NOW=2212.090122403
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NOW=2214.160121998
LAST: 2.070000 s
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LAST: 3.960001 s
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NOW=2222.090122671
LAST: 3.970000 s
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NOW=2224.160121632
LAST: 2.069999 s
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NOW=2228.120121316
LAST: 3.960000 s
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NOW=2230.090123030
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NOW=2232.160122704
LAST: 2.070000 s
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NOW=2236.120123044
LAST: 3.960000 s
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NOW=2240.090121969
LAST: 3.969999 s
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NOW=2242.160122453
LAST: 2.070000 s
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NOW=2246.120122246
LAST: 3.960000 s
CLOCK: 355.613000 µs
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NOW=2248.090122134
LAST: 1.970000 s
CLOCK: 324.386000 µs
TSC: 324.338448 µs
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NOW=2250.160121764
LAST: 2.070000 s
CLOCK: 325.146000 µs
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NOW=2254.120122227
LAST: 3.960000 s
CLOCK: 324.315000 µs
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NOW=2258.090123537
LAST: 3.970001 s
CLOCK: 355.347000 µs
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NOW=2260.160121923
LAST: 2.069998 s
CLOCK: 352.091000 µs
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LAST: 3.960001 s
CLOCK: 353.195000 µs
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NOW=2266.090122299
LAST: 1.970000 s
CLOCK: 321.688000 µs
TSC: 321.626879 µs
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NOW=2268.090126962
LAST: 2.000005 s
CLOCK: 387.459000 µs
TSC: 387.416581 µs
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NOW=2268.160122392
LAST: 0.069995 s
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NOW=2270.160127275
LAST: 2.000005 s
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NOW=2272.120121694
LAST: 1.959994 s
CLOCK: 318.380000 µs
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NOW=2274.120127225
LAST: 2.000006 s
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NOW=2276.090122482
LAST: 1.969995 s
CLOCK: 350.154000 µs
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NOW=2278.160121859
LAST: 2.069999 s
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LAST: 3.960000 s
CLOCK: 348.486000 µs
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NOW=2284.090121948
LAST: 1.970000 s
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NOW=2286.090127997
LAST: 2.000006 s
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LAST: 0.069994 s
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NOW=2288.160126679
LAST: 2.000004 s
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NOW=2292.120126736
LAST: 3.960000 s
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NOW=2294.090122821
LAST: 1.969996 s
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NOW=2296.160121637
LAST: 2.069999 s
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NOW=2300.120122198
LAST: 3.960001 s
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NOW=2304.090128313
LAST: 3.970006 s
CLOCK: 380.464000 µs
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NOW=2306.160127740
LAST: 2.069999 s
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NOW=2310.120127246
LAST: 3.960000 s
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NOW=2312.090122408
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NOW=2314.160123453
LAST: 2.070001 s
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NOW=2318.120123641
LAST: 3.960000 s
CLOCK: 340.593000 µs
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NOW=2322.090128388
LAST: 3.970005 s
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NOW=2324.160127541
LAST: 2.069999 s
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LAST: 3.959999 s
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NOW=2330.090127670
LAST: 1.970001 s
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NOW=2332.160128197
LAST: 2.070001 s
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LAST: 3.959994 s
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NOW=2340.090121624
LAST: 3.969999 s
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NOW=2342.160122022
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LAST: 3.960000 s
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NOW=2348.090122389
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LAST: 3.960000 s
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LAST: 1.970000 s
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LAST: 2.070001 s
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LAST: 3.959999 s
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LAST: 3.970000 s
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LAST: 2.069999 s
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NOW=2386.160121986
LAST: 2.069999 s
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NOW=2390.120123106
LAST: 3.960001 s
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LAST: 3.970000 s
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LAST: 3.960000 s
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NOW=2402.090122325
LAST: 1.970000 s
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LAST: 2.000004 s
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LAST: 0.069995 s
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NOW=2406.160127550
LAST: 2.000006 s
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LAST: 1.959995 s
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LAST: 2.000005 s
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NOW=2412.090122500
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LAST: 2.070000 s
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LAST: 3.960000 s
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LAST: 3.960000 s
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NOW=2430.090121976
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NOW=2432.160122139
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LAST: 3.970005 s
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NOW=2442.160127236
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NOW=2450.160125150
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NOW=2454.120126427
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NOW=2486.160122411
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