I tried all of this :/ still, 256/512 descriptors seem to work the best.
Happy to let you log into the machine and fiddle around if you want :)
Paul
Ingo Flaschberger wrote:
Dear Paul,
what could cause this?
*) kern.polling.idle_poll enabled?
*) kern.polling.user_frac ?
*) kern.polling.reg_frac ?
*) kern.polling.burst_max ?
*) kern.polling.each_burst ?
I tried tons of different values for these and nothing made any
significant difference.
Idle polling makes a difference, allows more pps, but still errors.
Without idle polling it seems PPS is limited to HZ * descriptors, or
1000 * 256 or 512
but 1000 * 1024 is the same as 512.. 4000 * 256 or 2000 * 512 works
but starts erroring 600kpps (SMP right now but it happens in UP too)
I have patched src/sys/kern/kern_poll.c to support higher burst_max
values:
#define MAX_POLL_BURST_MAX 10000
When setting kern.polling.burst_max to higher values, the server reach
a point, where cpu-usage goes up without load, so try to keep below
this values. I also have set the network card to 4096 rx-"ram", to
have more room for late polls.
Kind regards,
Ingo Flaschberger
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