Date: Thu, 28 Nov 2002 12:06:28 +0100
From: KELEMEN Peter <fuji@elte.hu>
To: linux-kernel@vger.kernel.org
Subject: Re: NFS performance ...
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* Marc-Christian Petersen (m.c.p@wolk-project.de) [20021124 15:23]:

Marc, Andrea,

> I think Andrea and me have something in our kernels that may
> cause it. For me I don't know what that can be. I even have no
> idea what it can be :(

The culprit turned out to be an inherited CONFIG_NFS_DIRECTIO
setting.  Having the client kernel (2.4.20rc2aa1) this option
turned off, performance is stable 4 MB/sec (server hasn't
changed).  This is almost twice as good as with 2.4.19-rmap14b.

I understand the CONFIG_NFS_DIRECTIO warning in Configure.help,
but why does it affect 1) client performance and 2) shouldn't it
only matter for files opened with open(..., O_DIRECT)?

> Peter, have you also tested v3 over tcp?

No, for various administrative reasons.

Peter

-- 
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