From: Bruce Fields <bfields@fieldses.org>
To: Chuck Lever <chuck.lever@oracle.com>
Cc: Trond Myklebust <trond.myklebust@hammerspace.com>,
Kevin Vasko <kvasko@gmail.com>,
Linux NFS Mailing List <linux-nfs@vger.kernel.org>
Subject: Re: NFSv4 client locks up on larger writes with Kerberos enabled
Date: Thu, 26 Sep 2019 12:05:56 -0400 [thread overview]
Message-ID: <20190926160556.GC29192@fieldses.org> (raw)
In-Reply-To: <1BC54D7A-073E-40FD-9AA3-552F1E1BD214@oracle.com>
On Thu, Sep 26, 2019 at 08:55:17AM -0700, Chuck Lever wrote:
> > On Sep 25, 2019, at 1:07 PM, Bruce Fields <bfields@fieldses.org> wrote:
> >
> > On Wed, Sep 25, 2019 at 11:49:14AM -0700, Chuck Lever wrote:
> >> Sounds like the NFS server is dropping the connection. With
> >> GSS enabled, that's usually a sign that the GSS window has
> >> overflowed.
> >
> > Would that show up in the rpc statistics on the client somehow?
>
> More likely on the server. The client just sees a disconnect
> without any explanation attached.
So watching a count of disconnects might at least tell us something?
> gss_verify_header is where the checking is done on the server.
> Disappointingly, I see some dprintk's in there, but no static
> trace events.
Kevin, was this a Linux server?
--b.
> > In that case--I seem to remember there's a way to configure the size of
> > the client's slot table, maybe lowering that (decreasing the number of
> > rpc's allowed to be outstanding at a time) would work around the
> > problem.
>
> > Should the client be doing something different to avoid or recover from
> > overflows of the gss window?
>
> The client attempts to meter the request stream so that it stays
> within the bounds of the GSS sequence number window. The stream
> of requests is typically unordered coming out of the transmit
> queue.
>
> There is some new code (since maybe v5.0?) that handles the
> metering: gss_xmit_need_reencode().
next prev parent reply other threads:[~2019-09-26 16:05 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-18 23:36 NFSv4 client locks up on larger writes with Kerberos enabled Kevin Vasko
[not found] ` <E172CA50-EC89-4072-9C1D-1B825DC3FE8B@lysator.liu.se>
2019-09-19 14:19 ` Kevin Vasko
[not found] ` <72E82F62-C743-4783-B81E-98E6A8E35738@lysator.liu.se>
2019-09-19 14:58 ` Kevin Vasko
2019-09-25 16:48 ` J. Bruce Fields
2019-09-25 17:06 ` Chuck Lever
2019-09-25 18:44 ` Kevin Vasko
2019-09-25 18:49 ` Chuck Lever
2019-09-25 19:10 ` Kevin Vasko
2019-09-25 20:07 ` Bruce Fields
2019-09-26 15:55 ` Chuck Lever
2019-09-26 16:05 ` Bruce Fields [this message]
2019-09-26 19:55 ` Bruce Fields
2019-09-30 14:51 ` Kevin Vasko
2019-09-30 16:19 ` Bruce Fields
2019-09-26 7:30 ` Daniel Kobras
2019-09-26 16:25 Kevin Vasko
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