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Subject: Re: large files unnecessary trashing filesystem cache?
From: Badari Pulavarty <pbadari@gmail.com>
To: Lee Revell <rlrevell@joe-job.com>
Cc: Guido Fiala <gfiala@s.netic.de>, lkml <linux-kernel@vger.kernel.org>,
       andrew@osdl.org
In-Reply-To: <1129695001.8910.57.camel@mindpipe>
References: <200510182201.11241.gfiala@s.netic.de>
	 <1129695001.8910.57.camel@mindpipe>
Content-Type: text/plain
Date: Wed, 19 Oct 2005 08:43:01 -0700
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On Wed, 2005-10-19 at 00:10 -0400, Lee Revell wrote:
> On Tue, 2005-10-18 at 22:01 +0200, Guido Fiala wrote:
> > Of course one could always implement f_advise-calls in all
> > applications
> 
> Um, this seems like the obvious answer.  The application doing the read
> KNOWS it's a streaming read, while the best the kernel can do is guess.
> 
> You don't really make much of a case that fadvise can't do the job.

The issue is, how will "other/random" programs/applications affect 
performance of my application.

Complain I hear most is from our database folks, they tune stuff
and they are happy with their performance. And then, some one does 
a tar/cp/cpio/ftp/backup/compile on some random files on the system.
Suddenly, database performance drops. They want to see a system wide/
per-filesystem tunable on how much pagecache it takes up.

Andrew, does this make sense at all ?


Thanks,
Badari

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