From: "Florin Iucha" <florin@iucha.net>
To: linux-kernel@vger.kernel.org
Cc: faith@acm.org
Subject: Adaptec-2920 eats too much cpu time when reading from the CD-ROM
Date: Wed, 5 Dec 2001 21:01:54 -0600 [thread overview]
Message-ID: <20011206030154.GA5979@iucha.net> (raw)
Hello,
I have recently purchased a Plextor 12x CD-RW and I have attached it to
and Adaptec-2920 SCSI card. The card uses the "Future Domain Corp. TMC-18C30
[36C70]" chip.
The problem I see: when reading from the CD-RW my system becomes very
unresponsive and top reveals 90-95% of the time is spent on "system".
My CPU is AMD K6-III/500MHz with 256 Mb RAM.
When reading the same CD using the IDE DVD-ROM the time spent in system
is 5%. Also when the CD-RW is connected to the Advansys SCSI controller
the CPU usage is also negligible. The Adaptec-2920 uses IRQ 10 and does
not share it with any other board.
I notice an unusual number of interrupts in /proc/interrupts: after the
machine has been up for a couple of hours and I have written three CDs,
the statistics are:
CPU0
0: 638458 XT-PIC timer
1: 15325 XT-PIC keyboard
2: 0 XT-PIC cascade
5: 0 XT-PIC es1371
8: 1 XT-PIC rtc
9: 17004 XT-PIC usb-uhci
10: 3032143 XT-PIC fdomain
11: 58021 XT-PIC advansys
12: 2995779 XT-PIC eth0
14: 107542 XT-PIC ide0
15: 6895 XT-PIC ide1
When loading the fdomain module I get:
scsi1: <fdomain> No BIOS; using scsi id 7
scsi1: <fdomain> TMC-36C70 (PCI bus) chip at 0xdc00 irq 10
Bad boy: fdomain (at 0xd08b7866) called us without a dev_id!
Is there anything I can try?
Thanks,
florin
--
"If it's not broken, let's fix it till it is."
41A9 2BDE 8E11 F1C5 87A6 03EE 34B3 E075 3B90 DFE4
next reply other threads:[~2001-12-06 3:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-06 3:01 Florin Iucha [this message]
2001-12-06 9:28 ` Adaptec-2920 eats too much cpu time when reading from the CD-ROM Alan Cox
2001-12-06 13:51 ` Florin Iucha
2001-12-06 14:11 ` Alan Cox
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