From: Pavel Machek <pavel@suse.cz>
To: SodaPop <soda@xirr.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Oscillations in disk write compaction, poor interactive performance
Date: Mon, 16 Apr 2001 15:29:29 +0000 [thread overview]
Message-ID: <20010416152928.B40@(none)> (raw)
In-Reply-To: <200104122134.QAA24106@xirr.com>
In-Reply-To: <200104122134.QAA24106@xirr.com>; from soda@xirr.com on Thu, Apr 12, 2001 at 04:34:32PM -0500
Hi!
> It also seems that in the 2.4 kernels, we can get into a sort of
> oscillation mode, where we can have long periods of disk activity
> where nothing can get done - the low points, where only 2-3 writes
> per second can occur, so completely screw up the interactive
> performance that you simply have to take your hands off the
> keyboard and go get coffee until the disk writes complete. I know
> we get better performance overall this way, but it can be
> frustrating when this occurs in the middle of video capture.
I see oscilation even in 2.2.X case....
Can you try running while true; do sync; sleep 1; done? It should help.
If it helps, try playing with bdflush/kupdate or how is it called/ parameters.
--
Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.
next prev parent reply other threads:[~2001-04-16 21:17 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-12 21:34 Oscillations in disk write compaction, poor interactive performance SodaPop
2001-04-16 15:29 ` Pavel Machek [this message]
2001-04-17 14:55 ` SodaPop
2001-04-18 18:40 ` Giuliano Pochini
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