Re: [Xen-devel] PCI passthrough issue

[Jean Baptiste Favre <xen-devel@xxxxxxxxxxx>]

Hello,


Le 25/02/2011 15:40, Konrad Rzeszutek Wilk a écrit :
> On Fri, Feb 18, 2011 at 10:14:13PM +0100, Jean Baptiste Favre wrote:
>> Hello,
>> Back online after my exams :)
>>
>> Had some time to perform tests with my Debian Squeeze 32bits domU and
>> 2.6.37 kernel from experimental.
> 
> I am bit lost now.. Can you refresh my memory whether the 'copy_break'
> parameter worked or not?
> 
> Experimental is the stock kernel or was that a new proposed kernel?
> Where are the sources for the experimental kernel?
> 
>> DomU config is:
>> *****************************************************************
>> kernel       = '/cluster/kernels/vmlinuz-2.6.37-trunk-686-bigmem'
>> ramdisk      = '/cluster/kernels/initrd.img-2.6.37-trunk-686-bigmem'
>> #kernel       = '/cluster/kernels/vmlinuz-2.6.37-trunk-686-bigmem-sky2'
>> #ramdisk      = '/cluster/kernels/initrd.img-2.6.37-trunk-686-bigmem-sky2'
>> builder      = 'linux'
>> memory=268
>> vcpus        = '1'
>> cpus         = '2'
>> localtime    = 0
>> serial       = 'pty'
>> boot         = 'cdn'
>> disk         = [ 'drbd:xps-106,xvda,w' ]
>> on_poweroff  = 'destroy'
>> on_reboot    = 'restart'
>> on_crash     = 'restart'
>> name         = 'xps-106'
>> hostname     = 'xps-106.clichy.jbfavre.org'
> 
> I had a box with a sky2 adapter that looked to have a similar issue but
> found the culprit to be the switch. So at this point I am having no luck
> reproducing this. Would it be possible for you to stick the kernel + dist
> image somewhere so I can try it out on my box?
> 
>>
>> extra = "root=/dev/mapper/xps--106-root ro iommu=soft swiotlb=force
>> console=hvc0 xencons=tty"
> 
> Try without 'swiotlb=force' on any kernel that is PVOPS. Only the older
> ones (lenny) required that. And you don't need 'xencons=tty' either with
> PVOPS kernels.
Thought I already tried without 'swiotlb=force', but seems not...

Just tried it on my Debian domU, and everything works now, whatever
copybreak value can be.

But trying the same with OpenWRT gives following results:
- With 'swiotlb=force': fails for size equal or greater than 128 bytes
(or ping -s86)
- Without 'swiotlb=force': always fails

I can provide OpenWRT disk img and kernel. For Debian domU, I can
provide a dd from LVM and kernel. Let me know which ones you want.

Regards,
JB

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