Re: virtio net regression

[Antoine Martin <antoine@devloop.org.uk>]

Hi,

The bug report below does indeed match everything I have experienced.
Upon further inspection, 2.6.28.9 is also affected, just less so.

Unfortunately I have applied this patch to 2.6.29.1:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=2f181855a0
And if anything, it made things worse... (speed was down to just 6KB/s
because of the number of broken packets)
Any ideas?

Cheers
Antoine



Mark McLoughlin wrote:
> On Sun, 2009-04-19 at 14:48 +0300, Avi Kivity wrote:
>> Antoine Martin wrote:
>>> -----BEGIN PGP SIGNED MESSAGE-----
>>> Hash: SHA512
>>>
>>> Wireshark was showing a huge amount of invalid packets (wrong checksum)
>>> - - that was the cause of the slowdown.
>>> Simply rebooting the host into 2.6.28.9 fixed *everything*, regardless
>>> of whether the guests use virtio or ne2k_pci/etc.
>>> The guests are still running 2.6.29.1, but I am not likely to try that
>>> release again on the host anytime soon! Ouch!
>>>   
>>
>> Strange, no significant tun changes between .28 and .29.
> 
> Sounds to me like it's this:
> 
>   http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=2f181855a0
> 
> davem said he was queueing up for stable, but it's not in yet:
> 
>   http://kerneltrap.org/mailarchive/linux-netdev/2009/3/30/5337934
> 
> I'll check that it's in the queue.
> 
> Cheers,
> Mark.
>