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From: John Baldwin <jhb@freebsd.org>
To: freebsd-stable@freebsd.org
Subject: Re: nfs slowdown (RELENG_8) (solved)
Date: Mon, 30 Jun 2014 13:49:16 -0400
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 (bigwig.baldwin.cx); Mon, 30 Jun 2014 13:51:16 -0400 (EDT)
Cc: Rick Macklem <rmacklem@uoguelph.ca>
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On Thursday, June 26, 2014 9:54:42 pm Mike Tancsa wrote:
> On 6/25/2014 9:34 AM, Mike Tancsa wrote:
> > On 6/25/2014 9:12 AM, Eugene Grosbein wrote:
> >> ktrace  cat /dev/zero > /nfsbackup/test
> 
> Adding
> 
> hw.igb.enable_msix=0 to /boot/loader.conf
> 
> fixes it.  cat /dev/zero is now ~ 600Mb/s.  Not the same speed as dd, 
> but a lot better compared to 25Mb

What if you do 'hw.igb.num_queues=1' instead?

-- 
John Baldwin