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Re: [Xen-users] 3.0.0 and gplpv

To: Pasi Kärkkäinen <pasik@xxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] 3.0.0 and gplpv
From: jim burns <jim_burn@xxxxxxxxxxxxx>
Date: Mon, 25 Jul 2011 15:48:18 -0400
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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'.

> > 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.

> [...]
> 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.


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