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Date: Wed, 27 Apr 2005 19:15:23 +0200
From: Marc Olzheim <marcolz@stack.nl>
To: Brian Fundakowski Feldman <green@freebsd.org>
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cc: Marc Olzheim <marcolz@stack.nl>
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Subject: Re: NFS client/buffer cache deadlock
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On Wed, Apr 27, 2005 at 12:08:57PM -0400, Brian Fundakowski Feldman wrote:
> > Yes, a single writev(). Just like in the kern/79207 PR.
> >=20
> > It doesn't have to be superfast (why would I use NFS otherwise), just as
> > long as it's threadsafe / atomic.
>=20
> Alright, this will do synchronous, instead of short, writes (also,
> of course, not deadlock the system) if you are trying to use an
> excessively large buffer size.
>=20
> <http://green.homeunix.org/~green/nfs_client.deadlock.patch>
> <http://green.homeunix.org/~green/nfs_client.deadlock.HEAD.patch>

Great! This seems to do the trick and isn't that slow (about 2.8 MB/sec
over 100 MBit, writing 600 * 1MB, 4.x gets about 5.5 MB/sec on the same
system); it's fast enough for me and more importantly, it doesn't lock
the system down anymore. ;-)

Thanks a lot!

Marc

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