Re: [Xen-users] Bandwidth between VMs on Xen

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-01-13 at 16:39 +0530, Jaya Dhanesh wrote:
> Hi,
> 
> I created 2 vm and connected them using a bridge. The bridge was
> created using brctl command.
> I set the mtu of the interface in the vm and the bridge to 4096. When
> I tried to copy an image from one vm to another it was very slow and
> the rate was 30 kbps. But when the mtu was reduced to 1500, the rate
> increased to 3 mbps.  How does an decrease in the mtu increases the
> transfer speed?

Once you add the Ethernet headers every frame is taking just over 1
page, wasting most of the second one. It perhaps also depends on the
size of packets your test is generating.

4096 is an unusual MTU I think, typical values are 1500 and 9000.

Ian.


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