[Devel] atl1 (Attansic L1 Gigabit Ethernet) driver & TCP weirdness

[Vasily Averin]

On 01/31/2011 01:05 PM, Vasily Averin wrote:
> On 01/31/2011 11:29 AM, Vasily Averin wrote:
>> just FYI: I've found this hardware locally, node is free for investigation.
>> I'm reinstalling Centos to this node right now and then I will try to reproduce
>> reported issue.
>
> I can confirm this issue,
> upload to this node is normal, but download is slow.

FYI:
I've recompiled driver from sources (atl1-1.2.40.3) and it works well on 
2.6.18-028stab083.1 kernel.

>> On 01/30/2011 11:28 AM, Solar Designer wrote:
>>>> On 01/30/2011 11:08 AM, Vasily Averin wrote:
>>>>> could you please check 2.1.3 driver version?
>>>>> ftp://ftp.hogchain.net/pub/linux/attansic/atl1/centos5.2/
>>>
>>> For certain reasons, this is a bit time-consuming for me to test, but
>>> I'll leave your message flagged as needing further work in case I find
>>> time for it.
>>>
>>> On Sun, Jan 30, 2011 at 11:18:15AM +0300, Vasily Averin wrote:
>>>> btw. could you please try to decrease MTU to 1492?
>>>
>>> I've already tried lowering the MTU (1400, etc.) - this did not help.
>>>
>>>> 5. If you see this message (or lots of them) in your system log:
>>>>
>>>> atl1 0000:02:00.0: hw csum wrong, pkt_flag:1600, err_flag:80
>>>
>>> No, I am not seeing any messages like this. No complaints from the
>>> driver at all.
>>>
>>> I think I need to emphasize that things work just fine from OpenVZ
>>> containers on the same system! No problems at all. The problem only
>>> shows up when transferring something from the "host system" (CT0).
>>> So it looks OpenVZ-related, not just driver-related.
>>>
>>> Thanks,
>>>
>>> Alexander
>>>
>>
>