[lkml]   [2003]   [Mar]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Subject2.4: high system load with SG_IO on IDE-SCSI: PIO?

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
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:33    [W:0.020 / U:0.072 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site