Messages in this thread | | | Date | Wed, 5 Dec 2001 21:01:54 -0600 | From | "Florin Iucha" <> | Subject | Adaptec-2920 eats too much cpu time when reading from the CD-ROM |
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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."
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