On 27/08/2019 22:59, Eugene Grosbein wrote:
28.08.2019 2:22, Victor Gamov wrote:
Also, you should monitor interrupt numbers shown by "systat -vm 3" for igb*
devices
at hours of most load. If they approach 8000 limit but not exceed it,
you may be suffering from this and should raise the limit with
/boot/loader.conf:
hw.igb.max_interrupt_rate=32000
It's about 5000-7000 per rxq
7000 is quite close considering it is average for quite long period (a second
or seconds).
It can hit 8000 for some ticks easily in your case.
Eugene, can you explain me what max_interrupt_rate means? Calomel
explain it as "# maximum number of interrupts per second generated by
single igb". So if I increase it then more irq per sec will be
generated and more context switch produced. Why I need to increase it?
You should raise the limit as soon as possible. I'd advise to double it upto
16000 first
but if you cannot afford extra reboot better use 32000 as it's just fine for
1Gbps link.
# sysctl hw.igb.max_interrupt_rate
sysctl: unknown oid 'hw.igb.max_interrupt_rate'
#
Is it possible to set it at boot time only?
--
CU,
Victor Gamov
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