From: Andrew Morton <akpm@digeo.com>
To: vda@port.imtp.ilyichevsk.odessa.ua
Cc: Paolo Ciarrocchi <ciarrocchi@linuxmail.org>,
linux-kernel@vger.kernel.org
Subject: Re: Poor performance with 2.5.52, load and process in D state
Date: Wed, 25 Dec 2002 00:41:05 -0800 [thread overview]
Message-ID: <3E096F21.DBD6BEF5@digeo.com> (raw)
In-Reply-To: 200212250824.gBP8Nus17429@Port.imtp.ilyichevsk.odessa.ua
Denis Vlasenko wrote:
>
> ...
> I wonder whether swappiness should be related to the speed
> ratio between storage types? How exactly?
It doesn't matter. Assuming the latency of the swap device is the
same as the filesystem device it cancels out. We're simply trying
to minimise the total amount of I/O.
> Having to play with tunables is not an ideal way to go,
> I hate to think that Andrew's (and others) work can go down
> the drain at the very next technology jump.
It's constant-access-time mass storage technology which will toss 20
years development down the gurgler. Top to bottom, everything is
designed to support the locality=bandwidth characteristics of spinning
disks.
next prev parent reply other threads:[~2002-12-25 8:33 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-22 11:37 Poor performance with 2.5.52, load and process in D state Paolo Ciarrocchi
2002-12-23 11:29 ` Andrew Morton
2002-12-25 13:12 ` Denis Vlasenko
2002-12-25 8:41 ` Andrew Morton [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-12-22 17:09 Paolo Ciarrocchi
2002-12-23 12:44 Paolo Ciarrocchi
2002-12-26 0:03 Paolo Ciarrocchi
2002-12-26 7:44 ` Andrew Morton
2002-12-26 9:26 Paolo Ciarrocchi
2002-12-26 9:34 ` Andrew Morton
2002-12-26 9:45 Paolo Ciarrocchi
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