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

[Jaya Dhanesh <jaya.dhanesh@xxxxxxxxxxxx>]

I am sending packets for size of 1500 bytes. For 1500, shouldn't it work 
fine?
On 01/13/2014 04:46 PM, Ian Campbell wrote:
> 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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