From: Suresh Jayaraman <sjayaraman@novell.com>
Subject: Re: Differences between 2.6.5 und 2.6.16: getattr with
 actimeo=0 and O_DIRECT
Date: Tue, 13 Nov 2007 16:19:08 +0530
Message-ID: <47398124.6070708@novell.com>
References: <4739686E.8080501@googlemail.com>
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Cc: nfs@lists.sourceforge.net
To: Gerd Bavendiek <gerd.bavendiek@googlemail.com>
In-Reply-To: <4739686E.8080501@googlemail.com>
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Gerd Bavendiek wrote:

> 
> analyzing performance issues with Oracle databases on an NFS client
> running on SLES9 SP3 and NetApp as NFS server, I found that in SLES9
> SP3 each write call is followed by an getattr. This is not the case
> with SLES10 SP1.

The changes between 2.6.5 and 2.6.16 are too many that it is not easy to
track down.

> I do
> 
> dd if=/dev/zero of=/mnt/qqq oflag=direct bs=8k count=100000
> 
> and using tcpdump (BTW, is there an easier way ?) I see with SLES9 SP3
> (i.e. 2.6.5-7.244) each single 8k write followed by an getattr (which
> comes at some cost).

I Would suggest trying the latest kernel update from Novell/SUSE.

If the issue is seen in the latest kernels, create a bug report in
Novell/SUSE bugzilla - https://bugzilla.novell.com

Thanks,
-- 
Suresh Jayaraman

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