Date: Tue, 28 Apr 2015 23:27:28 -0700 From: John-Mark Gurney <jmg@funkthat.com> To: Garrett Wollman <wollman@bimajority.org>, Rick Macklem <rmacklem@uoguelph.ca>, freebsd-net@FreeBSD.org, Mark Schouten <mark@tuxis.nl> Subject: Re: Frequent hickups on the networking layer Message-ID: <20150429062728.GI37063@funkthat.com> In-Reply-To: <20150429051659.GA2180@nparhar-pc> References: <4281350517-9417@kerio.tuxis.nl> <137094161.27589033.1430255162390.JavaMail.root@uoguelph.ca> <21824.26416.855441.21454@hergotha.csail.mit.edu> <20150429051659.GA2180@nparhar-pc>
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Navdeep Parhar wrote this message on Tue, Apr 28, 2015 at 22:16 -0700:
> On Wed, Apr 29, 2015 at 01:08:00AM -0400, Garrett Wollman wrote:
> > <<On Tue, 28 Apr 2015 17:06:02 -0400 (EDT), Rick Macklem <rmacklem@uoguelph.ca> said:
> ...
> > > As far as I know (just from email discussion, never used them myself),
> > > you can either stop using jumbo packets or switch to a different net
> > > interface that doesn't allocate 9K jumbo mbufs (doing the receives of
> > > jumbo packets into a list of smaller mbuf clusters).
> >
> > Or just hack the driver to not use them. For the Intel drivers this
> > is easy, and at least for the hardware I have there's no benefit to
> > using 9k clusters over 4k; for Chelsio it's quite a bit harder.
>
> Quite a bit harder, and entirely unnecessary these days. Recent
> versions of the Chelsio driver will fall back to 4K clusters
> automatically (and on the fly) if the system is short of 9K clusters.
> There are even tunables that will let you set 4K as the only cluster
> size that the driver should allocate.
Can we get this to be the default? and included in more drivers too?
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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