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Date:      Wed, 27 Oct 2004 10:22:10 -0700
From:      Kris Kennaway <kris@obsecurity.org>
To:        Ben Mesander <ben@timing.com>
Cc:        current@freebsd.org
Subject:   Re: -current NFSv2 and NFSv3 issues
Message-ID:  <20041027172210.GA59514@xor.obsecurity.org>
In-Reply-To: <16767.52483.986921.670394@piglet.timing.com>
References:  <16767.52483.986921.670394@piglet.timing.com>

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On Wed, Oct 27, 2004 at 10:29:55AM -0600, Ben Mesander wrote:
> Hi all,
>=20
>   We're seeing some data corruption and performance problems here with
> NFSv3/TCP on a machine running -current NFS client against a 4.8 NFS
> server.
>=20
>   The problems can be reproduced by doing a 'make buildworld' over
> NFS.  With NFSv2 & UDP we could buildworld with -j8 and the build
> would usually - but not always - complete successfully. The times when
> it did not appeared to possibly be a result of the mtime.tv_usec not
> being checked for files over NFS (ie, one build step creates a .depend
> file, and another step tries to use it before it "appears" over NFS).

Is this a vfs.nfs.access_cache_timeout issue?  I don't remember if
that does negative caching as well.

Kris

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