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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Feb 10, 2010 at 11:52:17AM +0300, Matthieu Patou wrote:
> On 09/02/2010 21:12, Pasi Kärkkäinen wrote:
>> 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
>>    
> Unfortunately for driver reason it's not a possibility.
>

Too bad..

>>>> 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
> I'll try to give a try to testing version of xen to see if it brings  
> anything good.
>

I don't think it's related to Xen hypervisor. It's more probable that it's
a problem in dom0 linux (kernel).

-- Pasi


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