Date: Fri, 11 Sep 2015 12:12:41 +0300 From: Dmitry Sivachenko <trtrmitya@gmail.com> To: FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: netisr process eats 100% cpu Message-ID: <C2DA4FA5-0364-4811-BE75-49E858EE544E@gmail.com> In-Reply-To: <C4039E45-3DC7-4E1A-9E46-853FE812B906@gmail.com> References: <C4039E45-3DC7-4E1A-9E46-853FE812B906@gmail.com>
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> On 10 сент. 2015 г., at 19:45, Dmitry Sivachenko <trtrmitya@gmail.com> wrote:
>
> Hello!
>
> I am using fresh FreeBSD-10/stable.
>
> I have a program which establish a TCP connection to server and sends a lot of small requests over it.
> I put haproxy load balancer working in TCP mode in the middle, which listens some port on localhost.
>
> Under the relatively low network load (20MB/sec, ~100 kpps), netisr process starts to consume close to 100% CPU, and does not allow to utilize more network bandwidth:
>
> 11 root -72 - 0K 944K CPU27 27 0:34 98.06% intr{swi1: netisr 0}
>
> If I do not pass traffic through haproxy but connect directly to remote server, netisr process consumes 0% CPU and everything works well.
>
> Is it rather expected or this can be fixed?
>
> Thanks in advance.
Also I want to add that netisr process consume CPU only when TCP client and haproxy are running on the same host. If I move haproxy to a separate machine, netisr process does show in top(1) output at all.
So this looks weird at least.
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