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Date: Sun, 6 Jul 2014 21:15:29 -0400 (EDT)
From: Rick Macklem <rmacklem@uoguelph.ca>
To: "Russell L. Carter" <rcarter@pinyon.org>
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Subject: Re: NFS client READ performance on -current
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Russell L. Carter wrote:
> 
> 
> On 07/03/14 17:51, Rick Macklem wrote:
> 
> > Well, I took a quick look at the driver and it does use m_defrag(),
> > but
> > I think that the "retry:" label it does a goto after doing so might
> > be in
> > the wrong place.
> > 
> > The attached untested patch might fix this.
> > 
> > Is it convenient to build a kernel with this patch applied and then
> > try
> > it with TSO enabled?
> 
> Patch applied to both client and server (both nics use if_em),
> net.inet.tcp.tso=1
> 
> With a cold 5GB transfer, I see a fairly steady mid 60s MB/s reading
> on the client.  I'm happy BTW.  The throughput is now sufficient for
> my application.
> 
Thanks for testing this. I've emailed some guys that I think might be
able to review and/or test/commit this. (I don't mind doing the commit,
but I don't have hardware to test it on.)

rick

> HTH,
> Russell
> 
> > 
> > rick
> > ps: It does have the transmit segment limit set to 32. I have no
> > idea if
> >     this is a hardware limitation.
> > 
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