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

[Vasily Averin]

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.

> 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
>>
>