Xen devel - Mar 2008 - Re: Massive problems with ''PCI-DMA: Out of SW-IOMMU space for XXX bytes [..]'' with 3Ware controller

Keir Fraser wrote:
>>> Have you tried a vendor Xen kernel for your distro?
>> 
>> That''s the last thing I wanted to try but couldn''t
find time to
reboot
>> the affected server to test it out. My intention was not to use a
distro
>> kernel, as Debians 2.6.18 is patched for XEN 3.0.3. I could stay with
my
>> current 3.0.4 system and I would be more recent.
> 
> Can you try our more up-to-date Linux kernel at:
>  http://xenbits.xensource.com/linux-2.6.18-xen.hg
> 
> Yes, you have to pull it from mercurial and configure and build it
> yourself, I''m afraid. But it would be useful to know whether this
is
> something we have fixed (knowingly or not) and simply not yet
backported
> to 3.1 branch.
Hi Keir,

I Have the same problem as Markus describes
My system:
- dual quad xeon
- 8 GB RAM
- 3ware 9650se with 2 disks in raid 1
- ubuntu 7.10 server
- xen 3.2 and 2.6.18.8 kernel compiled from (xen) source

I tried using the kernel compiled from the mercurial repository. The
build was successful, but the problem stil exists. To support my "new"
controller I had to replace the source files (3w-9xxx.c/h) in the kernel
with the ones downloaded from the 3ware site. I don''t think
that''s
causing the errors, but I just want to mention it as well.
After some tests (running: dd if=/dev/zero of=/tmp/test) the following
messages (still) appear in the syslog:

...
Mar  1 16:47:15 grs-psr35 kernel: [ 1822.161742] PCI-DMA: Out of
SW-IOMMU space for 16384 bytes at device 0000:06:00.0
Mar  1 16:47:15 grs-psr35 kernel: [ 1822.161802] 3w-9xxx: scsi0: ERROR:
(0x06:0x001C): Failed to map scatter gather list.
Mar  1 16:47:15 grs-psr35 kernel: [ 1822.161814] sd 0:0:0:0: SCSI error:
return code = 0x00070000
Mar  1 16:47:15 grs-psr35 kernel: [ 1822.161818] end_request: I/O error,
dev sda, sector 18365314
...

If you need more information, or would like me to test something, I''ll
be happy to help.
Please respond to hugo@linuxbak.nl as well, since I''m not a member of
the mailing list.

Thanks for any help.

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