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In-Reply-To: <162966962721.9892.5962616727949224286@noble.neil.brown.name>
From:   Mike Javorski <mike.javorski@gmail.com>
Date:   Thu, 26 Aug 2021 12:34:29 -0700
Message-ID: <CAOv1SKB6xqyduf5L5hcXOe-xMN-UJOfFeE5eXVga3TviKuH0PA@mail.gmail.com>
Subject: Re: NFS server regression in kernel 5.13 (tested w/ 5.13.9)
To:     NeilBrown <neilb@suse.de>
Cc:     Chuck Lever III <chuck.lever@oracle.com>,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>
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Precedence: bulk

I finally had the chance to test with the offloading disabled on the
server. Unfortunately, the issues remain, may even be more frequent,
but I can't rule out confirmation bias on that one.

Not sure where to go from here.

- mike

On Sun, Aug 22, 2021 at 3:00 PM NeilBrown <neilb@suse.de> wrote:
>
> On Sun, 22 Aug 2021, Mike Javorski wrote:
> > 5.12.15-arch1:
> > ===============
> > 14723 137 0.00921938
> >
> > 5.13.12-arch1: (no freezes)
> > ===============
> > 15333 206 0.013257
> >
> > 5.13.12-arch1: (with freezes)
> > ===============
> > 9230 299 0.0313779
> >
> > So a decent bump w/ 5.13, and even more with the freezes.
>
> Thanks.  9->13 isn't as much as I was hoping for, but it might still be
> significant.
>
> > This machine is an older Opteron server w/ nforce networking. Not sure
> > how much offloading it actually does.
>
> The tcpdump showed the server sending very large packets, which means
> that it is at least doing TCP segmentation offload and checksum offload.
> Those are very common these days.
>
> Thanks,
> NeilBrown