07.08.2016 1:03, Eugene Grosbein пишет:
Hi!
Is there any high performance benchmark acting as http client for outer http
server
capable to receive 40Gbps without overwhelming CPU with insane number of
syscalls?
I've tried benchmarks/wrk version 4.0.2 and it works just fine upto 20Gbps
for my hardware: two 6-core (HT disabled) Intel(R) Xeon(R) CPU E5-2620 v3 @
2.40GHz
with two dual-port ix(4) 82599ES 10-Gigabit SFI/SFP+ Network Connection
combined to single lagg interface (lagghash l4).
But each worker pthread of wrk generates too many kqueue() system calls
polling for incoming data and eats 100% of its CPU core and cannot receive more.
Or, it may be some kqueue() kernel level lock contention, I do not know.
More worker threads, more overloaded CPU cores, no increase of transfer over
about 20Gbps.
Hmm, it seems that's not number of system calls that hurts me but some
kernel-level problem.
This is NUMA system running under 10.3-STABLE r303291. It has two NUMA domains
with first physical CPU (cores 0-7) and first dual-port ix adapter belonging to
one domain
and second CPU (cores 8-11) and second dual-port adatper belonging to another
domain:
http://www.grosbein.net/img/r4.svg
Just prepend of "cpuset -l 0-7" to wrk invocation boots transfer upto nearly
30Gbps
without any other changes. That's strange.
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