Messages in this thread | ![/](/images/icornerl.gif) | | Date | Sun, 9 Mar 2003 15:49:09 +0100 | From | Matthias Andree <> | Subject | 2.4: high system load with SG_IO on IDE-SCSI: PIO? |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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