[5.3Rp6] UFS buffer cache deadlock (was: NFS client/buffer cache deadlock)

[Marc Olzheim]

On Wed, Apr 27, 2005 at 10:17:46AM +0200, Marc Olzheim wrote:
> > > Btw. running the writev program with 20 * 100 MB on UFS on a 512MB
> > > FreeBSD 6-CURRENT system practicly locks the filesystem down _and_
> > > causes all processes to be swapped out in favor of the buffer cache.
> > > 'top' however, doesnt' show a rise in BUF usage.
> > > 
> > > On FreeBSD 4.x, the system performance as usual during the writev to
> > > UFS.
> > 
> > That's certainly not very optimal.  I don't know anything about it, sorry.
> 
> No problem. I just thought that they might be related (this is with a
> single writev() as well).

Hmm, doing the 20 * 100MB on a 5.3-RELEASE-p6 system with 256 MB memory
and 512MB swap (on UFS) hangs the machine. Luckily, I cannot reproduce
it on 5.4-STABLE :-/

Marc
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