freebsd stable - Aug 2015 - dev.ix.0.queueX.interrupt_rate

On Tue, Aug 25, 2015 at 04:04:41PM +0200, Gerrit K"uhn wrote:
> On Tue, 25 Aug 2015 07:55:49 -0400 (EDT) Rick Macklem
> <rmacklem at uoguelph.ca> wrote about Re:
dev.ix.0.queueX.interrupt_rate:
> 
> 
> RM> If you have tso enabled, you could try this patch:
> RM>   https://reviews.freebsd.org/D3477
> RM> 
> RM> If TSO is disabled, then we don't have an explanation for poor
NFS
> RM> performance yet. 
> 
> I tried both with or without TSO, and it does not appear to make any
> difference for me. I get about 50MB/s net write speed and about 200MB/s
> read. Even my 1GBE interface perform better in terms of writing.
> 
> RM> If you haven't seen it, you might want to keep an eye
> RM> on this thread: http://docs.FreeBSD.org/cgi/mid.cgi?55DC1B5A.8010109
> 
> Yes, I am watching this. Thanks for the pointer.
For discover poor network performance you need:

1. check cables
2. capture interface statisctics from all ports on paths on network
switchs
3. capture NIC statisctics on hosts (netstat -nbeI)
4. ifconfig -a
5. netstat -rn
6. /var/log/dmesg.boot

On Tue, 25 Aug 2015 19:45:08 +0300 Slawa Olhovchenkov <slw at zxy.spb.ru>
wrote about Re: dev.ix.0.queueX.interrupt_rate:

SO> For discover poor network performance you need:

[...]

I am already through this, see
<https://lists.freebsd.org/pipermail/freebsd-net/2015-June/042536.html>

I just wanted to let /you/ know that my interrupt rates look similar (you
asked for that).
I think there are a couple of people on the mailing lists reporting
performance issues with ix interfaces and (especially?) NFS lately. Would
be great if we could find and fix the root cause(s)...


cu
  Gerrit