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Re: [Xen-users] Re: About swiotlb and " ...PCI-DMA: Out of SW-IOMMU..."error

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: Frank Abel Cancio Bello <frankabel@xxxxxxxxxxxxxxxxxx>
  • Date: Sat, 08 Dec 2007 22:21:57 -0500
  • Delivery-date: Sat, 08 Dec 2007 19:29:10 -0800
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>

But I haven't a 3ware on my server and I have the same problem.

Frank Abel

On Sun, 2007-12-09 at 03:31 +0100, Markus Schuster wrote:
> Shaun R. wrote:
> > [..]
> >  The only solution i've found to stopping this from happening is
> > to force dom0 to use less than 2GB of ram.  In my case i forced my dom0 to
> > use 1024MB of ram leaving the rest (around 15GB) on vacation.  
> > 
> > I'm running 3ware 9560 controllers btw too if it matters.
> I've had a discussion (subject: "Massive problems with 'PCI-DMA: Out of
> SW-IOMMU space for XXX bytes [..]' with 3Ware controller") with Keir Fraser
> on xen-devel this days because of this problem and for /me dom0 memory size
> does not matter (I've tried to not restrict dom0 (so it can use almost all
> of my 2GB) and to set it to only 128MB - no difference). 
> btw: I own a 3ware 9500 - so we use the same driver - 3w_9xxx - maybe here
> the problem starts...
> Here is a quote from an e-mail Keir sent me off-list:
> > Sounds like the 2.6.18 kernel is screwed then. Perhaps the
> > 2.6.18 driver leaks swiotlb space... I haven't got many spare cycles right
> > now to look into this. Probably the next step though might be to dump the
> > swiotlb state when this bug-out happens, and see if the state looks like a
> > leak has been happening. A leak makes sense given that you seem to run out
> > of space eventually regardless of swiotlb size.
> For what I can say for now is that it does not happen on my old 2.6.16
> kernel patched for Xen 3.0.4. With a 2.6.18 patched for Xen 3.1.2 it
> happens. Will do some additional tests this days (if time permits). 
> Regards, 
> Markus
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Participe en Universidad 2008.
11 al 15 de febrero del 2008.
Palacio de las Convenciones, Ciudad de la Habana, Cuba

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