Re: [Xen-users] Fwd: Re: dom0 speed issues

[Niki Vasilev <nikolay.vasilev@xxxxxxxxxxx>]

Hi Roger,

I played around with this server few days now .... I downgraded to xen 
4.2.1 version, the balloon error is gone and the speed is not decreasing 
any more ...looks like this was the problem
Thank you for your help!

Cheers,

Niki


On 27/05/15 11:10, Roger Pau Monné wrote:
> El 26/05/15 a les 17.29, Niki Vasilev ha escrit:
> > Hi Roger,
> >
> > I logged everything you asked. I am attaching the results, they are in
> > tar.gz
> Some of the requested info is missing, like the output of xl info and xl
> dmesg, can you please send those also?
>
> You seem to have quite a lot of errors related to the balloon driver:
>
> System RAM resource [mem 0x148000000-0x14fffffff] cannot be added
> xen_balloon: reserve_additional_memory: add_memory() failed: -17
>
> It seems like the balloon driver is trying to hot-add a memory region
> that's already present. AFAICT you are using the 3.10 version of the
> Linux kernel, which seems to b missing this two commits to the balloon
> driver that prevents it from iterating when the error is found:
>
> fd8b79 xen/balloon: Don't continue ballooning when BP_ECANCELED is
> encountered
> 3dcf63 xen/balloon: cancel ballooning if adding new memory failed
>
> Can you try to figure out if those messages are related to the IO
> throughput issue (ie: they appear at the same time as IO throughput
> degrades)?
>
> Roger.

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