Re: [Xen-users] 3.0.0 and gplpv

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Jul 25, 2011 at 03:48:18PM -0400, jim burns wrote:
> On Mon July 25 2011 3:31:22 PM Pasi wrote:
> > On Sat, Jul 23, 2011 at 02:26:56PM -0400, jim burns wrote:
> > > Pls cc: me, as I am not subscribed.
> > 
> > Hello,
> 
> Hi, Pasi! Long time no 'see'.
> 

indeed! If you're going to XenSummit next week we can see for real! :)


> > > I've noticed that 3.0.0 as a backend is very slow, which is to be
> > > expected since the drivers were stated as being unoptimized,
> > > particularly xen-netback. I'm getting speeds between 10-20 Mb/s with
> > > iperf and gplpv.
> > 
> > Something is definitely broken - even with the "unoptimized" xen-netback
> > in upstream Linux 3.0.0 you should get at least a gigabit per second (on a
> > current hardware).
> 
> I'm not even close to being on 'current' hardware. On 2.6.32, I get about 
> 120Mb/s recv rate to the domu, which is fine with me. We had this discussion 
> a 
> couple of years ago, when I was subscribed. Same hardware as then.
> 

Just to verify.. you mean 120 Mbit/sec? (which is pretty slow..)


> > [...]
> > Did you check/verify eth stats? errors/drops? anything in kernel logs?
> > 
> > Keep in mind there are *many* non-xen related changes aswell between 2.6.32
> > and 3.0.0.
> 
> I don't remember anything jumping out at me in 'ifconfig', but I'll look at 
> it 
> more closely when I provide James the tcpdump he asked for, in a few days. 
> Definitely nothing in the dom0 kernel or qemu-dm logs.
> 

Ok.

-- Pasi


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