Re: [Xen-users] slow network with gplpv drivers in vlan setup

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Feb 09, 2010 at 04:38:24PM +0300, Matthieu Patou wrote:
> On 09/02/2010 11:19, Fajar A. Nugraha wrote:
>> On Tue, Feb 9, 2010 at 3:10 PM, Matthieu Patou
>> <mat+Informatique.xen@xxxxxxxxx>  wrote:
>>    
>>>> I faced quite a long time ago a problem on some of my servers:
>>>>        
>>    
>>>> This might not be directly related, but I used 0.11.0.188 yesterday
>>>> for an XP domU, RHEL's xen (3.1.2). While copying files, the
>>>> performance was dreadfully slow. MUCH slower than QEMU. A bit
>>>> puzzling, since on another system I have a similar setup, but with
>>>> Gitco's Xen 3.4.1.
>>>>
>>>> Uninstalled that GPLPV version, and install 0.10.0.142. What do you
>>>> know, they worked great :D Haven't got time to find out what exactly
>>>> is wrong though. So if you still have problems, you might want to try
>>>> that too.
>>>>
>>>>        
>>> The thing is that I remember having this problem since 0.9.xx so it's a
>>> constant problem.
>>>      
>> You didn't mention what hardware/Xen version you use.
>> As James mentioned, the problem might be related to network cards.
>> Turning off Large Send might solve your problem (at the cost of extra
>> settings effort, and possible higher CPU usage).
>>    
> Right, I am on a debian lenny which is shipped with xen 3.2.1 (a bit old  
> ... right).
> Hardware is Intel Gigabit 80003ES2LAN.
>
> But I also have this behavior on a test workstation with the same OS but  
> the following nic:  BCM5784M Gigabit Ethernet
>

Hmm.. the bug could be in the dom0 kernel. Lenny's 2.6.26-2-xen is known to 
have many issues.

Can you try linux-2.6.18-xen as dom0 kernel? Or centos5 kernel-xen?
Both of those are known to work as dom0 without problems.

http://wiki.xensource.com/xenwiki/XenDom0Kernels


>> However, from my experince with RHEL and tg3, sometimes driver and
>> firmware version matters as well. So if you have time, I suggest:
>> - check server manufacturer's website to see if they have a newer firmware
>> - update your OS, or change to known-good OS. On some systems I use
>> RHEL5 with Gitco's updated Xen RPM, which works great with vlans and
>> even bonding.
>>    
> I didn't find any update for the moment.
> I'm not very familiar with this gitco stuff, what is it exactly ?
>

gitco.de/repo/ is newer xen hypervisor rpms for rhel5/centos5,
but it seems you're using Debian so it doesn't help you.

-- Pasi


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