Re: [Xen-users] DomU to DomU throughput issue

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Sep 16, 2009 at 02:29:35PM +0530, Fasiha Ashraf wrote:
> Hi
> Is there anyone who has successfully resolved the low throughput problem in 
> Guest communication.
> I am using Xen3.4.1 with PV os kernel 2.6.30-rc6-tip On fedora11. While 
> running netperf benchmark on guests throughput results are very low 
> DomU to DomU    0.29 Mbps
> 
> Why is it so? What would be the problem. Is there any issue with fc11 
> platform?

- Is domU <-> dom0 slow aswell? 
- Is domU <-> internet slow? 

- Do you have errors on domU ethX interfaces?
- Do you have errors no dom0 interfaces (pethx, all bridges, all vifs).

- Does domU or dom0 have high CPU-usage? What does "top" show in dom0,
  and in domU?

- What does "xm top" say about CPU usage? 

- Do you have errors in the logs? Please check
        - dom0 dmesg
        - dom0 /var/log/messages
        - Xen log: "xm log"
        - Xen dmesg: "xm dmesg"
        - domU dmesg
        - domU /var/log/messaegs

Please try all of the above.

-- Pasi


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