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SubjectRe: AMD 760MPX DMA lockup (partly solved) 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.


| Jan "Yenya" Kasprzak <kas at { - work | - private}> |
| GPG: ID 1024/D3498839 Fingerprint 0D99A7FB206605D7 8B35FCDE05B18A5E |
| Czech Linux Homepage: |
|----------- If you want the holes in your knowledge showing up -----------|
|----------- try teaching someone. -- Alan Cox -----------|
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