Date: Wed, 27 Apr 2005 19:15:23 +0200 From: Marc Olzheim <marcolz@stack.nl> To: Brian Fundakowski Feldman <green@freebsd.org> Cc: freebsd-stable@freebsd.org Subject: Re: NFS client/buffer cache deadlock Message-ID: <20050427171523.GB5984@stack.nl> In-Reply-To: <20050427160857.GF5789@green.homeunix.org> References: <20050420173859.GA99695@stack.nl> <20050426140701.GB5789@green.homeunix.org> <20050426151751.GB68038@stack.nl> <20050426155043.GC5789@green.homeunix.org> <20050426160609.GA68511@stack.nl> <20050426162549.GD5789@green.homeunix.org> <20050426164346.GA68763@stack.nl> <20050426193602.GE5789@green.homeunix.org> <20050427081746.GA66441@stack.nl> <20050427160857.GF5789@green.homeunix.org>
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--9zSXsLTf0vkW971A Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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 --9zSXsLTf0vkW971A Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD) iD8DBQFCb8irezjnobFOgrERAjj4AJ4vD+GytxecSZSwHOqfiaHVJVKGhwCZAQ6u p/p88ZFKAaHcD9YFpZFejSs= =cRNQ -----END PGP SIGNATURE----- --9zSXsLTf0vkW971A--
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