Frequent hickups on the networking layer

[John-Mark Gurney]

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 at 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."