[LAU] SCSI controller (aic7xxx) and xruns on 2.6 rt9 kernel

Hi,

I have many xruns when I read/write files on my SCSI
disks. The suspected module is aic7xxx. I read a thread
on LAU ('xrun madness') about this, but it dates back
to 2004 and gives no solution. This problem does not
occur with my other SATA drives. Could someone give me
advices to troubleshoot this?

Details:

I have an Adaptec 39160 controller and 2 disks
in a RAID1 (software) array. The module is aic7xxx.
My filesystem is ext3. I use debian/unstable with a 2.6.22
RT kernel and RTirq. I tweaked my PCI latencies to 0
for the Adaptec PCI bus using setpci.

Jackd being launched RT, I have no xruns with
journalling operations or updatedb. But moderately
intense operations on this array do cause many many xruns:
for instance loading files into memory (launching
firefox, or apt-get update, or copying files).
Of course, recording music with Ardour causes
many xruns too.

Quite surprisingly (for me), I have no xruns when
using my other SATA RAID5 (software) array, even
very intensively.

Thank you for your help!

Romain

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Received on Sun Sep 30 20:15:02 2007