RE: [Linux-ia64] Basic Advice Needed

From: Van Maren, Kevin <kevin.vanmaren_at_unisys.com>
Date: 2002-04-03 01:14:10
> As someone pointed out, the network and SCSI adapters may be causing
> problems. It has an Adaptec Ultra160 dual channel SCSI card for
> example, which definitely seems nonstandard.

Yes, that card works well -- if you have the right driver.

Use the latest Adaptec driver from Justin Gibbs.  There was a bug in the
early 39-bit DMA support that caused the kernel to crash periodically
[if the address just happened to overlab the swiotlb in the low 32 bits].

He incorporated my fix in Change 420:
http://people.freebsd.org/~gibbs/linux/

If you want to see if that affects you, look at the call to
pci_unmap_single();
if the second parameter is:
   ahc_le32toh(scb->sg_list[0].addr),
you have the broken version.  Note that the 2.4.9 kernel has the broken
version,
and IA64 kernels before that didn't support 39-bit DMA (which leads to
problems
under load, unless you greatly increase swiotlb size).  Not sure what
version
is in the newer IA64 kernels.

Kevin
Received on Tue Apr 02 07:14:39 2002

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