linux-kernel - Re: [PATCH v3 00/17] vfs: add the ability to retry on ESTALE to several syscalls

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Message-ID: <1342032143.2190.22.camel@iscandar.digidescorp.com>
Date:	Wed, 11 Jul 2012 13:42:23 -0500
From:	"Steven J. Magnani" <steve@...idescorp.com>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	viro@...IV.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	michael.brantley@...haw.com, hch@...radead.org, miklos@...redi.hu,
	pstaubach@...grid.com
Subject: Re: [PATCH v3 00/17] vfs: add the ability to retry on ESTALE to
 several syscalls

Jeff -

On Fri, 2012-06-29 at 14:57 -0400, Jeff Layton wrote: 
> This patchset is the third version of the patchset to add ESTALE
> handling to several syscalls. The basic idea is to allow the client to
> gracefully retry the lookup and call when a NFS server returns ESTALE.

I exercised this using 3.5-rc5 against a memory-starved server that
exports a FAT-backed filesystem. Where normally I see lots of ESTALE
errors due to inode eviction, with this patchset I see none. And, the
performance is much better than the only other way I know to eliminate
the errors, which is to mount with 'lookupcache=none'.

It's not an exhaustive test by any means, just a data point for you. 
Thanks!

Lightly-tested-by: Steve Magnani <steve@...idescorp.com>
------------------------------------------------------------------------
Steven J. Magnani               "I claim this network for MARS!
www.digidescorp.com              Earthling, return my space modulator!"

#include <standard.disclaimer>


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