Re: [Xen-devel] Status of "Out of SW-IOMMU space" problem?

[Philippe Vanhaesendonck <xen@xxxxxxxxxxx>]

Well, I have to add 2 eurocents on this issue ;)

I am struggling with this since months, but I could not do too much, 
having all servers in production. I eventually managed to setup a test 
server, so I hope I can progress on this.
As you say, latest firmware update does not help (to be correct, i have 
the *feeling* it took me more time to reproduce, but it crashed anyway).
So far, I have the following observations:
- Xen 3.1.0 and the associated kernel (2.6.18) works (this is what we 
have on all our production servers)
- Any newer version starting from Xen 3.1.1 (again each time with the 
matching kernel) show the "Out of SW-IOMMU space" problem
In all cases, I am using the same 3ware 3w-9xxx driver from 3ware, as 
the 9650SE is not supported in the stock kernel. So the issue is coming 
from 'elsewhere'.
I had a look in what happened between 3.1.0 and 3.1.1, and we have a 
handful of changes in linux-2.6-xen-sparse/arch/i386/kernel/swiotlb.c (5 
changesets to be precise)
I'll try to spend some time in reverting these changes to see if it helps...

--
Philippe

Stephan Seitz wrote:
> No, firmware updates doesn't solve this issue.
> At least not for us. I updated different 7000 and 8000 series controller
> without any success.
> But I'm also interested if there's some patch around for this 'out of 
> sw-iommu'
> error ;)
>
> Stephan
>
>
> Keir Fraser schrieb:
> > I'd be interested to know if it does. Unfortunately I have my doubts 
> > since
> > the patch fixes a page-boundary straddling issue, and if that were 
> > the root
> > problem it's unlikely to be affected by controller firmware updates.
> >
> >  -- Keir
> >
> > On 31/3/08 18:23, "Christopher S. Aker" <caker@xxxxxxxxxxxx> wrote:
> >
> > > Is the "dma: avoid unnecessarily SWIOTLB bounce buffering" patch likely
> > > to fix the "Out of SW-IOMMU space" issue with 3ware cards and Xen, or
> > > any other patches for that matter?
> > >
> > > I know some people have had success updating their 3ware card's 
> > > firmware
> > > to latest, but that's not easily achievable for our situation.  So,
> > > we're stuck on 2.6.16.x for dom0 :(

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