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Re: [Xen-devel] compound skb frag pages appearing in start_xmit

Thursday, November 15, 2012, 3:31:42 AM, you wrote:

> On 2012-10-11 18:14, Ian Campbell wrote:
>> On Thu, 2012-10-11 at 11:05 +0100, Eric Dumazet wrote:
>>> On Thu, 2012-10-11 at 12:00 +0200, Sander Eikelenboom wrote:
>>>> Probably due to the BUG_ON from the patch below, i changed it into a 
>>>> WARN_ON.
>>>> And i seem to hit it, but only in one of the guests at the moment and it 
>>>> triggers quite irregularly.
>>> xennet_make_frags() is able to split the skb->head in multiple page-size
>>> chunks.
>>> It should do the same for fragments
>> Right, I just want to be reproduce the issue so I can know I've fixed it
>> properly ;-)
> Hi Ian,

> I can reproduce this BUG_ON when running netperf/netserver test between 
> two domus running on the same dom0. The domu and dom0 all use v3.7-rc1.

> When I tried to rebase my persistent grant netfront/netback patch on 
> latest kernel, netperf/netserver test never succeeded. I did some test 
> to find out that v3.6-rc7 works fine, but v3.7-rc1, v3.7-rc2 and 
> v3.7-rc4 does not succeed in netperf/netserver test. So I keep my 
> persistent grant patch only based on v3.4-rc3 now.

> Konrad thought about commit 6a8ed462f16b8455eec5ae00eb6014159a6721f0 in 
> v3.7-rc1, and suggested me to test your debug patch in netfront. This 
> BUG_ON happens soon after running the netperf/netserver test case.

> Thanks
> Annie

Is there any progression with this bug (rc6 is out the door, so the release of 
3.7-final seems to be eminent and this bug completely cripples any networking 
with guests) ?


>> Ian.
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