Re: [Xen-devel] Re: pci passthrough xhci host controller

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Sep 30, 2010 at 09:24:48PM +0200, Sander Eikelenboom wrote:
> Hello Konrad,
> 
> I have done some more tests, the results:
> 
> - boot xen with mem=4G, > 2 days uptime with passthrough and videograbbing
> - boot xen without mem=4G, < 1 day freeze with passthrough and videograbbing
> - on both no problems as long as you don't grab video (so the controller 
> doesn't do much)
> - on both no problems when grabbing video with usb2, so it's xhci specific
> 
> I haven't changed anything else, same number of VM's running etc. etc., 
> videograbbing is working on both (until the freeze or until i ended the test)
> I'm reading some messages about msi(-x) interrupt problems with xen on 
> xen-devel, and suggestions to try noirqbalance with xen, so on both i use 
> noirqbalance.
> 
> So it seems to be related to the amount of mem available.
> I do see one difference on the domU, with mem=4G i see some occasional 
> warnings in syslog:
> Sep 28 17:55:02 security kernel: [81744.078288] xhci_hcd 0000:07:00.0: WARN: 
> transfer error on endpoint
> Sep 28 17:55:02 security kernel: [81744.092653] xhci_hcd 0000:07:00.0: WARN: 
> transfer error on endpoint
> Sep 28 17:55:02 security kernel: [81744.093647] xhci_hcd 0000:07:00.0: WARN: 
> transfer error on endpoint
> Sep 28 17:55:02 security kernel: [81744.093647] xhci_hcd 0000:07:00.0: WARN: 
> transfer error on endpoint
> Sep 28 17:55:02 security kernel: [81744.093647] xhci_hcd 0000:07:00.0: WARN: 
> transfer error on endpoint
> 
> I don't see these warnings in the syslog when no mem=4G is used, so a hunch 
> would be it goes wrong there while the xhci code tries to clean something up.
> It could do something "strange" that seems to work on bare metal and on xen 
> with mem=4G, but freezes everything with mem > 4G and gives no time to write 
> the warning to the syslog / disk in time.
> 
> in the syslog of dom0 i do see some occasional memleaks going by, but one set 
> could be related:
> Sep 28 17:55:19 localhost kernel: [81962.053321] kmemleak: 22 new suspected 
> memory leaks (see /sys/kernel/debug/kmemleak)
> 
> I will add a script that cat's the content of /sys/kernel/debug/kmemleak to 
> syslog when kmemleak reports new suspected leaks.
> 
> Any suggestions to try to debug this further ?

<shakes his head>
Do you have the name of the grabber + USB3 device? If it is not too much I might
as well get it and see what happens on my boxes.

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