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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