Ingo Molnar wrote:
* Dave Sperry <dave_sperry@xxxxxxxx> wrote:
I have a dual core Opteron machine that exhibits poor UDP performance
(RT consumes more than 2X cpu) with the 2.6.21-rc5-rt5 as compared to
2.6.21-rc5. Top shows the IRQ handler consuming a lot of CPU.
update: even with acpi_pm clocksource on vanilla i can reproduce similar
overhead using netperf.
Ingo
Hi Ingo
I checked the clock source and in both the vanilla and rt cases and they
were both acpi_pm
Here's the oprofile for my vanilla case:
CPU: AMD64 processors, speed 2211.37 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Cycles outside of halt state) with a
unit mask of 0x00 (No unit mask) count 100000
samples % image name app name
symbol name
36264 18.2763 forcedeth.ko forcedeth
nv_nic_irq_optimized
25602 12.9029 vmlinux vmlinux
spurious_interrupt
10067 5.0736 forcedeth.ko forcedeth
nv_start_xmit_optimized
8671 4.3700 vmlinux vmlinux
unregister_kprobe
8270 4.1679 vmlinux vmlinux
ctrl_dumpfamily
8042 4.0530 vmlinux vmlinux
expand_files
5064 2.5521 vmlinux vmlinux kfree
4365 2.1999 libc-2.5.so libc-2.5.so
__sendto_nocancel
4067 2.0497 vmlinux vmlinux
unix_bind
4010 2.0210 vmlinux vmlinux bad_gs
3929 1.9801 vmlinux vmlinux
__alloc_skb
3859 1.9449 vmlinux vmlinux
stack_segment
3107 1.5659 vmlinux vmlinux
__find_get_block
2816 1.4192 vmlinux vmlinux
vfs_create
2611 1.3159 vmlinux vmlinux
ide_end_drive_cmd
2604 1.3124 vmlinux vmlinux
ide_end_request
2560 1.2902 vmlinux vmlinux
find_get_page
2458 1.2388 vmlinux vmlinux
hrtimer_run_queues
2456 1.2378 vmlinux vmlinux
get_wchan
2403 1.2111 forcedeth.ko forcedeth
nv_tx_done_optimized
2231 1.1244 vmlinux vmlinux
do_sys_poll
Any thoughts?
Thanks
Dave
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