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



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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