From: Avi Kivity <avi@argo.co.il>
To: 7eggert@gmx.de
Cc: Badari Pulavarty <pbadari@gmail.com>,
Guido Fiala <gfiala@s.netic.de>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: large files unnecessary trashing filesystem cache?
Date: Wed, 19 Oct 2005 15:43:43 +0200 [thread overview]
Message-ID: <43564D8F.3000809@argo.co.il> (raw)
In-Reply-To: <E1ERzTq-0001IA-Ba@be1.lrz>
Bodo Eggert wrote:
>I guess the solution would be using random cache eviction rather than
>a FIFO. I never took a look the cache mechanism, so I may very well be
>wrong here.
>
>
Instead of random cache eviction, you can make pages that were read in
contiguously age faster than pages that were read in singly.
The motivation is that the cost of reading 64K vs 4K is almost the same
(most of the cost is the seek), while the benefit for evicting 64K is 16
times that of evicting 4K. Over time, the kernel would favor expensive
random-access pages over cheap streaming pages.
In a way, this is already implemented for inodes, which are aged more
slowly than data pages.
next prev parent reply other threads:[~2005-10-19 13:43 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4Z5WG-1iM-19@gated-at.bofh.it>
[not found] ` <4Z6zs-27l-39@gated-at.bofh.it>
2005-10-18 21:58 ` large files unnecessary trashing filesystem cache? Bodo Eggert
2005-10-18 23:05 ` Badari Pulavarty
2005-10-19 0:20 ` David Lang
2005-10-19 0:33 ` Fawad Lateef
2005-10-19 1:42 ` Bernd Eckenfels
2005-10-19 7:23 ` Bodo Eggert
2005-10-19 11:06 ` gfiala
2005-10-19 13:43 ` Avi Kivity [this message]
2005-10-18 20:01 Guido Fiala
2005-10-18 20:48 ` Badari Pulavarty
2005-10-20 15:23 ` Guido Fiala
2005-10-19 3:02 ` Andrew James Wade
2005-10-19 4:37 ` Andrew Morton
2005-10-19 5:45 ` Andrew James Wade
2005-10-19 11:01 ` gfiala
2005-10-19 11:10 ` gfiala
2005-10-19 15:54 ` Ingo Oeser
2005-10-19 19:49 ` Andrew Morton
2005-10-19 22:26 ` Paul Jackson
2005-10-20 6:28 ` Ingo Oeser
2005-10-19 4:10 ` Lee Revell
2005-10-19 15:43 ` Badari Pulavarty
2005-10-19 17:58 ` Guido Fiala
2005-10-19 18:43 ` Kyle Moffett
2005-10-19 18:52 ` Guido Fiala
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