Date: Thu, 10 Sep 2015 13:27:40 -0700 From: hiren panchasara <hiren@strugglingcoder.info> To: Dmitry Sivachenko <trtrmitya@gmail.com> Cc: FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: netisr process eats 100% cpu Message-ID: <20150910202740.GG64965@strugglingcoder.info> In-Reply-To: <C4039E45-3DC7-4E1A-9E46-853FE812B906@gmail.com> References: <C4039E45-3DC7-4E1A-9E46-853FE812B906@gmail.com>
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On 09/10/15 at 07:45P, Dmitry Sivachenko wrote:
> Hello!
>=20
> I am using fresh FreeBSD-10/stable.
>=20
> I have a program which establish a TCP connection to server and sends a l=
ot of small requests over it.
> I put haproxy load balancer working in TCP mode in the middle, which list=
ens some port on localhost.
>=20
> Under the relatively low network load (20MB/sec, ~100 kpps), netisr proce=
ss starts to consume close to 100% CPU, and does not allow to utilize more =
network bandwidth:
>=20
> 11 root -72 - 0K 944K CPU27 27 0:34 98.06% intr{s=
wi1: netisr 0}
>=20
> If I do not pass traffic through haproxy but connect directly to remote s=
erver, netisr process consumes 0% CPU and everything works well.
>=20
> Is it rather expected or this can be fixed?
Unsure at the moment if loopback is causing the trouble for you or not.
See:
https://lists.freebsd.org/pipermail/freebsd-net/2015-February/041239.html
You may want to try:
1) pmcstat and see if you can catch something
2) disable checksum on localhost
3) look at netisr settings. sysctl net.isr o/p and how it looks under
netstat -Q. I am not sure if adding more threads to netisr via
net.isr.numthreads would help. (Note its a loader.conf variable)
As I said, I am not sure whats up. Just throwing some ideas here.
Cheers,
Hiren
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