From: Matthias Andree <matthias.andree@gmx.de>
To: Linux-Kernel mailing list <linux-kernel@vger.kernel.org>
Subject: 2.4: high system load with SG_IO on IDE-SCSI: PIO?
Date: Sun, 9 Mar 2003 15:49:09 +0100 [thread overview]
Message-ID: <20030309144909.GA6475@merlin.emma.line.org> (raw)
Hi,
I have seen readcd ("sg driver 3.2.0") use 96% system time for a readcd
-c2scan on IDE-SCSI (ATAPI CD-ROM, Plextor PX-4824TA 1.04, UDMA/33),
Linux 2.4.19+SuSE patches (k_athlon-2.4.19-167).
...
ioctl(3, 0x2285, 0xbfffec20) = 0
...
The same application on a real SCSI-device with SCSI host adaptor
(aic7xxx FWIW) is way below 5% system CPU time.
Might SG_IO use PIO on ATAPI CD-ROMs? If so, are there patches to enable
DMA? Is this at all possible with SG_IO?
I find 96% system load is way too high for modern hardware. (Duron/700
that is, VIA 82C686a).
Thanks in advance,
--
Matthias Andree
next reply other threads:[~2003-03-09 14:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-09 14:49 Matthias Andree [this message]
2003-03-10 5:35 Douglas Gilbert
2003-03-10 11:31 ` Matthias Andree
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