linux-kernel - Re: read-ahead in NFS server

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Message-ID: <47730F2F.3080900@garzik.org>
Date:	Wed, 26 Dec 2007 21:34:23 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	saeed bishara <saeed.bishara@...il.com>
CC:	linux-kernel@...r.kernel.org, NFS list <linux-nfs@...r.kernel.org>
Subject: Re: read-ahead in NFS server

saeed bishara wrote:
> Hi,
> my NFS server seems not to utilize the read-ahead feature, my exported
> dir is located on ext3 fs over sata disk. the sata controller can
> issue commands up to 1MB, also I modified the read ahead under the sys
> to 1MB. but when the client do reads in 32KB chunks (rsize), I can see
> in the server side that all IOs are ~32KB. my kernel version is
> 2.6.22.7.
> according to the nfsd code, the NFS server should utilize the
> read-ahead feature, but what should I do
> to make it work?

(linux-nfs added to cc)

I cannot speak for the NFS server code specifically, but 32kb sounds 
like a network read (or write) data size limit.

Are you using TCP?  Are you using NFSv4, or an older version?

	Jeff


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