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

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!



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
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
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


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