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

[Matthieu Patou <mat+Informatique.xen@xxxxxxxxx>]

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.
> > > 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.
Matthieu.

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