VM in Xen 4.1; poor packet forwarding performance on xn0

[seanrees at gmail.com]

Hi Roger,

This is what they provided me:
- The Xen 4.x node is running a custom 3.1.1 kernel.
- The Xen 3.x node is running a 2.6.18 kernel.

They didn't elaborate on the customisations. :(

Sean



On Sat, Apr 26, 2014 at 1:06 PM, Roger Pau Monné <roger.pau at citrix.com>wrote:

> On 26/04/14 13:57, seanrees at gmail.com wrote:
> > Hi Roger,
> >
> > Thanks for the patch -- sadly, it didn't work. No change.
>
> Hello,
>
> >
> > I did have to modify a bit for releng/10.0; for some reason patch
> > refused to apply it cleanly. It looked fairly straightforward but I
> > attached inline the patch I ultimately applied below just in case I got
> > it wrong.
>
> Patch looks fine.
>
> > Are there any other potential differences between Xen 3.4 and 4.1? (my
> > provider migrated my problem VPS to a 3.4 host and the problem
> > evaporated; I am trying this on a new 4.1 VPS that I was able to
> > reproduce the problem on).
>
> I'm quite sure this is not related to the underlying Xen version, but to
> the Linux Dom0 kernel version your provider is using, could you ask them
> the Linux versions they are using on the 4.1 and 3.4 hosts?
>
> Roger.
>