Date: Thu, 27 Mar 2014 18:14:47 -0400 (EDT) From: Rick Macklem <rmacklem@uoguelph.ca> To: araujo@FreeBSD.org Cc: FreeBSD Filesystems <freebsd-fs@freebsd.org>, Alexander Motin <mav@freebsd.org>, FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: RFC: How to fix the NFS/iSCSI vs TSO problem Message-ID: <1882337939.1849245.1395958487066.JavaMail.root@uoguelph.ca> In-Reply-To: <CAOfEmZi-4nWUcwEG%2BSrO43K8xBJLNRD4whBPnjbSTMZHvF93Fg@mail.gmail.com>
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Marcelo Araujo wrote: > Hello All, > > > 2014-03-27 8:27 GMT+08:00 Rick Macklem <rmacklem@uoguelph.ca>: > > > > Well, bumping it from 32->35 is all it would take for NFS (can't > > comment > > w.r.t. iSCSI). ixgbe uses 100 for the 82598 chip and 32 for the > > 82599 > > (just so others aren't confused by the above comment). I understand > > your point was w.r.t. using 100 without blowing the kernel stack, > > but > > since the testers have been using "ix" with the 82599 chip which is > > limited to 32 transmit segments... > > > > However, please increase any you know can be safely done from > > 32->35, rick > > > > > I have plenty of machines using Intel X540 that is based on 82599 > chipset. > I have applied Rick's patch on ixgbe to check if the packet size is > bigger > than 65535 or cluster is bigger than 32. So far till now, on FreeBSD > 9.1-RELEASE this problem does not happens. > > Unfortunately all my environment here is based on 9.1-RELEASE, with > some > merges from 10-RELEASE such like: NFS and IXGBE. > > Also I have applied the patch that Rick sent in another email with > the > subject 'NFS patch to use pagesize mbuf clusters'. And we can see > some > performance boost over 10Gbps Intel. However here at the company, we > are > still doing benchmarks. If someone wants to have my benchmark result, > I can > send it later. > > I'm wondering, if this update on ixgbe from 32->35 could be applied > also > for versions < 9.2. I'm thinking, that this problem arise only on > 9-STABLE > and consequently on 9.2-RELEASE. And fortunately or not 9.1-RELEASE > doesn't > share it. > My understanding is that the 32 limitation is a hardware one for the 82599. It appears that other drivers than the ixgbe.c can be increased from 32->35, but not ixgbe.c (for the 82599 chips). rick > Best Regards, > -- > Marcelo Araujo > araujo@FreeBSD.org > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to > "freebsd-net-unsubscribe@freebsd.org" >
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