[Xen-bugs] [Bug 1227] New: Out of SW-IOMMU space, 3ware Raid controller/3w-xxxx module

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1227

           Summary: Out of SW-IOMMU space, 3ware Raid controller/3w-xxxx
                    module
           Product: Xen
           Version: unspecified
          Platform: Other
        OS/Version: Linux-2.6
            Status: NEW
          Severity: major
          Priority: P2
         Component: Hardware Support
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: t.rother@xxxxxxxxxxxxx


After copying some larger files (e.g. adding RPMs), the Dom0 spits out error
msgs (var/log/messages):

Apr 25 22:38:44 paikea kernel: PCI-DMA: Out of SW-IOMMU space for 8192 bytes at
device 0000:03:03.0
Apr 25 22:38:44 paikea kernel: 3w-xxxx: tw_map_scsi_sg_data(): pci_map_sg()
failed.
Apr 25 22:38:44 paikea kernel: sd 0:0:0:0: [sda] Result: hostbyte=DID_ERROR
driverbyte=DRIVER_OK,SUGGEST_OK
Apr 25 22:38:44 paikea kernel: end_request: I/O error, dev sda, sector 6553286

In parallel, the partition is re-mounted read-only and no file writing
operation is possible any more. Hardware used is an AMD 64 CPU, 3ware RAID
controller and 4 GB RAM memory.

---------------

Xen Version (drawn from the stock RPM of opensuse 10.3):

Name        : xen                          Relocations: (not relocatable)
Version     : 3.1.0_15042                       Vendor: SUSE LINUX Products
GmbH, Nuernberg, Germany
Release     : 51.3                          Build Date: Do 20 Dez 2007 21:02:18
CET
Install Date: So 02 Mär 2008 16:05:20 CET      Build Host: anonymi.suse.de
Group       : System/Kernel                 Source RPM:
xen-3.1.0_15042-51.3.src.rpm
Size        : 10984408                         License: GPL v2 only
Signature   : DSA/SHA1, Do 20 Dez 2007 21:06:44 CET, Key ID a84edae89c800aca
Packager    : http://bugs.opensuse.org
URL         : http://www.cl.cam.ac.uk/Research/SRG/netos/xen/

Kernel data: 
2.6.22.17-0.1-xen, 1 SMP 2008/02/10 20:01:04 UTC

grub menu.lst boot settings:
-------
title XEN -- openSUSE 10.3 - 2.6.22.17-0.1
    root (hd0,1)
    kernel /boot/xen.gz dom0_mem=512M
    module /boot/vmlinuz-2.6.22.17-0.1-xen root=/dev/sda2 keymap=de
    resolution=800x600 -- resume=/dev/sda1 splash=silent iommu=soft showopts
    module /boot/initrd-2.6.22.17-0.1-xen
-------

I have the same behavior with dom0_mem=256M and also without the iommu=soft
option.The error has also been reported on various sites and for other distros,
but not listed in the bug list yet. References:

1) xen-devel list, thread "Re: [Xen-devel] Massive problems with 'PCI-DMA: Out
of SW-IOMMU space for XXX bytes [..]' with 3Ware controller"
2)
http://forums.novell.com/novell-product-support-forums/suse-linux-enterprise-server-sles/sles-virtualization/310206-sles10sp1-xen-out-sw-iommu-kernel-problems-post1458810.html#post1458810


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