Messages in this thread |  | | Date | Sun, 16 Jun 1996 13:59:13 -0700 | From | Steve VanDevender <> | Subject | more DMA puzzlement |
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I've been doing some more tests on my system to try to get a better idea of what triggers the problems I'm having with my Gravis Ultrasound and my new Buslogic 545C SCSI card.
I was able to do this:
dd if=/dev/sda of=/dev/null bs=1024k count=1024
running ten concurrent invocations, staggered so they didn't all just read from each other's buffers, for over 40 minutes without triggering a reinitialization of my SCSI card.
However, if I did this:
dd if=/dev/zero of=foo bs=1024k count=128
it took only about three sequential invocations before I triggered the SCSI card reinitialization.
So it looks like there's something wrong with my system in terms of doing DMA reads, or in CPU-centric terms, device writes through DMA devices.
What I'm really interested in is if there is any way to kludge around this problem.
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