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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

What happens if you run the old kernel (32-bit 2.6.16) on new Xen? What
happens if you run a new (2.6.18) 32-bit kernel on new Xen? Do these tests
without inflating the swiotlb size on the command line. Or what about new
2.6.18 kernel on old Xen?

(You can run 32-bit kernel on 64-bit Xen in 3.1.x, but not in 3.0.x, by the
way.)

 -- Keir

On 25/11/07 16:03, "Markus Schuster" <ma.schuster@xxxxxx> wrote:

> Hi list, 
> 
> this days I've tried to update a 32bit XEN 3.0.4 system (kernel 2.6.16) to
> XEN 3.1.2 on AMD64 (kernel 2.6.18). The system has 2GB RAM and a 3ware
> 9500-12 SATA raid controller.
> 
> The old system worked fine for about half a year now.
> The new system boots fine so far but when doing some "bigger" changes to the
> filesystem I get a lot of this errors:
>> PCI-DMA: Out of SW-IOMMU space for 40960 bytes at device 0000:03:00.0
>> 3w-9xxx: scsi0: ERROR: (0x06:0x001C): Failed to map scatter gather list.
> (03:00.0 is the 3Ware Controller)
> 
> I've increased the 'swiotlb' kernel parameter in steps from 32, 64, 128, 256
> up to 512MB. The only effect is, that with 512MB my dom0 uses over 600MB of
> RAM (compared to ~50MB with XEN 3.0.4 on 32bit) and more fs-activity can be
> done before the error arises.
> I's very easy to reproduce, just do a 'dd if=/dev/zero of=/root/testfile'.
> After a short while (some seconds) the error arises.
> 
> The funny thing is: I've tried this dom0 on my workstation before installing
> it on a production server. My workstation has an nForce SATA controller and
> here I don't have any problems - even without setting the 'swiotlb' kernel
> paramter. 
> 
> It looks like there are some problems in conjunction with the 3Ware
> controller that have not been there on XEN 3.0.4 on 2.6.16 (32bit).
> 
> The complete piece of the logfile can be found here:
> http://nopaste.biz/21780
> And this is just from writing a 5MB initramfs to an ext2 filesytem (which
> had some corruption afterwards).
> 
> Thank's for your help!
> 
> Regards, 
> Markus Schuster
> 
> 
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