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    SubjectRe: AMD 760MPX DMA lockup (partly solved)
    kernel@street-vision.com wrote:
    : Well I have run this several times on my MPX, and it is fine.
    :
    : This is 2.4.20-pre1, dual AMD 2000MP, only difference is it is the Tyan
    : version of the MPX, not the MSI.
    :
    : Justin

    Justin, thanks for this! I've tried 2.4.20-pre1 with your
    .config (and then with my .config), and it works!

    Further investigation showed that the problem first appeared
    somewhere between 2.4.20-pre2 (works for me) and 2.4.20-pre5 (has the
    lock-up problem I've described). I was not able to test -pre3 and -pre4,
    because these kernel died on me during boot after the
    "Initializing RT netlink socket" message.

    I the bug got merged from the -ac kernels, because it is
    present bot in the kernel 2.4.19-11 from RedHat "null" beta
    and in 2.4.20-pre2-ac1 (altough the later crashes instead of lock-up).

    Denis Vlasenko wrote:
    :
    : 8 GB... Can you make it loop over much lesser size?
    :
    with 2GB it still fails. I didn't try less, because with 1GB of RAM
    it would not have any effect.

    : I assume removing read+lseek eliminates lockup?

    Partly. I've tried

    dd if=/dev/hda3 of=/dev/null bs=1024k, and it still causes filesystem
    corruption (altough no lockup).

    : Is it IDE related or not?
    : If you can test it over SCSI/NFS/ramdisk/???...

    I think it is IDE or DMA related.

    : > When I switch off the DMA (hdparm -d0 /dev/hda), the problem goes away
    : > (however, the disk is very slow, as expected).
    :
    : At which DMA/UDMA mode it starts to fail?

    -d1 -X33 fails.

    -Y.

    --
    | Jan "Yenya" Kasprzak <kas at {fi.muni.cz - work | yenya.net - private}> |
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