Re: [Xen-users] link mode on pv sles9

[jeroen groenewegen van der weyden <groen692@xxxxxxxxx>]

Fajar A. Nugraha wrote:
> On Fri, Jan 30, 2009 at 1:22 PM, jeroen groenewegen van der weyden
> <groen692@xxxxxxxxx> wrote:
>   
> > Hello,
> >
> > I have to install a SLES9 sp4 as domU. This distribution comes with kernel
> > 2.6.5-7-308 which I cannot compile with the para_virt_guest options.
> >     
> If you want to compile a kernel anyway, why not use new xen kernel from xen.org?
>
>   
Well this distribution comes with this kernel, the application running 
on check the kernel version!? and won't install unless it is this kernel 
version.
> > However the dom0 has a 1G nic but the link speed in the the domU with the
> > xennet module say the link mode is only 100mb and 1G is not even available
> > in domU.
> >
> >     
> It's not really related what link speed you have on dom0 and what you
> have on domU.
> For instance, even if dom0 has 10 Mbps link, domU can still have a
> link that says 100 Mbps speed. In this case domU <-> dom0 traffic can
> probably reach 100 Mbps, but domU <-> outside world will be capped at
> 10 Mbps max.
>
>   
> > Anybody knows why I do not see the 1G link mode available in domU?
> >     
> I haven't used PV driver on Linux HVM before, so I can't comment much about it.
> Perhaps it's simply because the domU network driver you use don't support 1Gbps.
>
>   
I guess this is the case.
> There's also another possibility: the link speed displayed on domU is
> meaningless.
>   
it seems to be the reality, with iperf i get a 100mb throughput. anyway 
it is more throughput then the hvm realtek.
> For example, when using Windows HVM domU with GPLPV driver, link speed
> is displayed as 1 Gbps. However, using iperf domU <-> dom0 can easily
> provide over 1 Gpbs speed (James said he got over 2Gbps. I only got
> 1.4). You should try using iperf to test your domU <-> dom0
> performance.
>
>   

> Regards,
>
> Fajar
>
>
> Regards,
>
> Fajar
>
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