From: Thomas Ford <thomas.ford@balliol.ox.ac.uk>
To: linux-kernel@vger.kernel.org
Subject: PIO disk writes using 100% system time and performing poorly with VIA vt82c686b on kernels 2.2 & 2.4
Date: Tue, 24 Apr 2001 15:00:21 +0100 [thread overview]
Message-ID: <20010424150020.A712@ford.balliol.ox.ac.uk> (raw)
Heavy disc writes (eg. unzipping linux kernel source) cause the system
processor usage (as reported by top/xosview) to jump to 100%, making
the X mouse/audio freeze etc.
Such problems occur with the drives connected to VIA vt82c686b south
bridge: the same drives on a mvp3 show no such problems.
The behaviour is the same on kernels 2.2.17 & 2.4.3 (both hand
compiled & RedHat's 2.4.2-2 & 2.2.17-14 in case I was doing something
wrong).
The problem is easily demonstrated by hdparm -t. The CPU use jumps to
system 100% as above and all my drives report ~1.9 MB/sec in PIO mode
which is far lower than PIO on the mvp3 (~10MB/s).
DMA mode appears to work fine but I am not using it due to publicised
potential problems.
Regards,
Tom Ford
next reply other threads:[~2001-04-24 14:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-24 14:00 Thomas Ford [this message]
[not found] <fa.hn82icv.1i1uioa@ifi.uio.no>
2001-04-24 15:37 ` John Weber
2001-04-24 23:19 Ignacio Monge
2001-04-24 21:45 ` Francois Cami
2001-04-24 22:12 ` Vojtech Pavlik
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