On Mon, Feb 28, 2022 at 3:34 PM Ivan Babrou <ivan@xxxxxxxxxxxxxx> wrote:
> I scheduled some reboots for overnight, one machine in each group:
>
> 1. Control on 5.15.25
> 2. Your previous patch with delayed flush on top of 5.15.25
> 3. Your current patch with targeted flush on top of 5.15.25
>
> Either Daniel or I should have some numbers tomorrow.
Numbers for #2 (previous patch):
$ sudo /usr/share/bcc/tools/funclatency -d 60 workingset_refault
Tracing 1 functions for "workingset_refault"... Hit Ctrl-C to end.
nsecs : count distribution
0 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 0 | |
8 -> 15 : 0 | |
16 -> 31 : 0 | |
32 -> 63 : 0 | |
64 -> 127 : 0 | |
128 -> 255 : 0 | |
256 -> 511 : 27313 |****************************************|
512 -> 1023 : 11887 |***************** |
1024 -> 2047 : 3718 |***** |
2048 -> 4095 : 7095 |********** |
4096 -> 8191 : 11860 |***************** |
8192 -> 16383 : 4193 |****** |
16384 -> 32767 : 470 | |
32768 -> 65535 : 320 | |
65536 -> 131071 : 107 | |
131072 -> 262143 : 20 | |
262144 -> 524287 : 2 | |
avg = 2929 nsecs, total: 196247510 nsecs, count: 66985
Numbers for #3 (the latest patch):
$ sudo /usr/share/bcc/tools/funclatency -d 60 workingset_refault
Tracing 1 functions for "workingset_refault"... Hit Ctrl-C to end.
nsecs : count distribution
0 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 0 | |
8 -> 15 : 0 | |
16 -> 31 : 0 | |
32 -> 63 : 0 | |
64 -> 127 : 0 | |
128 -> 255 : 0 | |
256 -> 511 : 6520 |****************************************|
512 -> 1023 : 3502 |********************* |
1024 -> 2047 : 726 |**** |
2048 -> 4095 : 2206 |************* |
4096 -> 8191 : 1078 |****** |
8192 -> 16383 : 70 | |
16384 -> 32767 : 39 | |
32768 -> 65535 : 28 | |
65536 -> 131071 : 8 | |
131072 -> 262143 : 1 | |
262144 -> 524287 : 11 | |
524288 -> 1048575 : 118 | |
1048576 -> 2097151 : 3722 |********************** |
2097152 -> 4194303 : 5854 |*********************************** |
4194304 -> 8388607 : 570 |*** |
8388608 -> 16777215 : 122 | |
avg = 1100789 nsecs, total: 27051906434 nsecs, count: 24575
Looks like you were right that targeted flush is not going to be as good.
