From: Andrea Arcangeli <andrea@suse.de>
To: James Pearson <james-p@moving-picture.com>
Cc: Andrew Morton <akpm@osdl.org>,
marcelo.tosatti@cyclades.com, linux-kernel@vger.kernel.org
Subject: Re: Reducing inode cache usage on 2.4?
Date: Tue, 21 Dec 2004 14:22:55 +0100 [thread overview]
Message-ID: <20041221132255.GI2143@dualathlon.random> (raw)
In-Reply-To: <41C80A04.9070504@moving-picture.com>
On Tue, Dec 21, 2004 at 11:33:24AM +0000, James Pearson wrote:
> Setting vm_mapped_ratio to 20 seems to give a 'better' memory usage
> using my very contrived test - running a find will result in about 900Mb
> of dcache/icache, but then running a cat to /dev/null will shrink the
> dcache/icache down to between 100-300Mb - running the find and cat at
> the same time results in about the same dcache/icache usage.
>
> I'll give this a go on the production NFS server and I'll see if it
> improves things.
Ok great. If 20 isn't enough just set it to 40, just be careful that if
you set it too high the system may swap a bit too early.
Overall this is still a workaround, real fix would be a background
scanning of the icache/dcache collisions in the hash buckets but that's
not for 2.4 ;).
next prev parent reply other threads:[~2004-12-21 13:23 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-17 17:26 Reducing inode cache usage on 2.4? James Pearson
2004-12-17 15:12 ` Marcelo Tosatti
2004-12-17 21:52 ` Willy Tarreau
2004-12-18 0:32 ` James Pearson
2004-12-18 1:21 ` Andrew Morton
2004-12-18 11:02 ` Marcelo Tosatti
2004-12-20 13:47 ` James Pearson
2004-12-20 12:46 ` Marcelo Tosatti
2004-12-20 15:10 ` Andrea Arcangeli
2004-12-20 15:06 ` Marcelo Tosatti
2004-12-20 17:54 ` Andrea Arcangeli
2004-12-20 15:43 ` Marcelo Tosatti
2004-12-20 19:20 ` Andrea Arcangeli
2004-12-21 11:33 ` James Pearson
2004-12-21 13:22 ` Andrea Arcangeli [this message]
2004-12-21 13:59 ` James Pearson
2004-12-21 14:39 ` Andrea Arcangeli
2004-12-18 15:02 ` Marcelo Tosatti
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