Re: KVM got slow after adding more physical memory to host

Avi Kivity
2011-09-06T17:29:41Z

On 09/06/2011 07:30 PM, Nikola Ciprich wrote:
> OK, seems like Avi's right, at least the windows guest is not using DMA
> though the question is, why did it got disabled

It can happen due to a timeout, perhaps a temporary load spike.

> and how can I reenable it,

Google knows.

> I'm not experienced that much with XP :(
>
>
> > It is rep/in-out. But why it became noticeable only after adding more
> > physical memory to the host is a mystery.
>
> now that I'm thinking about it, we had similar problem in the past, the windows guest
> was unusably slow, and the whole host was slow as well... upgrading to 0.14.1 seemingly
> solved this issue, but maybe the DMA just got randomly enabled, and now after adding
> the memory (and restarting of course), it just got disabled again?
> but why could this be??
>

I don't think it's related to the memory.

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