Re: [Xen-devel] PCI passthrough issue

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

Hello,
Sorry for long silent period.

I'm taking night classes to get an engineering degree and am in the
midst of exams this whole week.

I'll be back available next week to perform required tests and will
provide you an update as soon as possible.

Regards,
JB

Le 04/02/2011 15:01, Jean Baptiste Favre a Ãcrit :
> Le 04/02/2011 14:50, Ian Campbell a Ãcrit :
>> On Fri, 2011-02-04 at 13:15 +0000, Jean Baptiste Favre wrote:
>>
>>>
>>>>> What is a bit strange here is that I don't any more the KERN_CRIT printk
>>>>> message.
>>>>> Could be a false positive ?
>>>>
>>>> Worth bearing in mind, lets see what the next test run produces.
>>> Seems that I got this messge only with copybreak=0.
>>> With default value (128), no such message
>>>
>>> More, with copybreak=0, all packets are dropped (even a ping with
>>> default packet size is dropped. Same with ping -s1)
>>
>> Hang on, I thought you previously said copybreak=0 made everything work
>> ok. If that isn't definitely the case then we may be following a red
>> herring.
> That's something I'm investigating.
> Under Debian, copybreak=0 solve the problem
> Under OpenWRT, copybreak=0 + patch breaks. Will try without patch.
> 
>> Are you saying that copybreak=0 + this patch breaks? That would be very
>> surprising since the patch doesn't cause any flow control differences.
>>
>> Perhaps there is some difference between your self-built kernels and the
>> Debian kernels you started with? Perhaps you should try the self built
>> kernel with no patches, just to confirm it behaves the same as the
>> Debian kernels?
> Under Debian, I use 2.6.37 from experimental
> Under OpenWRT, use legacy 2.6.37, build env applies patches for OpenWRT
> and compile.
> 
> OpenWRT provides complete build env, as I still have problem compiling
> Debian 32bits kernel from 64bits env. That's why I switched back to
> openWRT for testing.
> 
> 
>>>> Thanks.
>>>>
>>>> Please gather the tcpdump's too.
>>> Both tcpdump from GW and domU are Attached.
>>
>> Were these collected with or without patches? With or without ethtool -K
>> options? With or without copybreak?
>>
>> Please try and be explicit about everything you post, there are lots of
>> variables in the air.
> OK, sorry. Will redo all tests
> 
> Regards,
> JB
> 
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