linux-kernel - READDIRPLUS max mount option

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Message-ID: <47D1995E.6060501@krose.org>
Date:	Fri, 07 Mar 2008 14:37:02 -0500
From:	Kyle Rose <krose@...se.org>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: READDIRPLUS max mount option

I have a very specific use for an NFS mount over a WAN, and allowing for 
much larger expected READDIRPLUS requests actually improves performance 
by at least a factor of 10 by eliminating the round-trip latency that 
results from the application's single-threaded 
readdir/stat/stat/stat/... behavior.  Rather than maintain a hacked 
kernel on my end, I'd rather the READDIRPLUS limit be a mount option.  
Hence, the following patch.  It defaults to the old behavior 
(8*PAGE_SIZE), but with a properly-prepared mount binary will allow the 
client to specify a limit.

I'm not subscribed to the list, so please CC me in any relevant discussion.

Kyle

View attachment "readdirplusmax.patch" of type "text/x-patch" (10064 bytes)