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Re: [Qemu-discuss] VM tuning

From: Peter Kieser
Subject: Re: [Qemu-discuss] VM tuning
Date: Fri, 04 Oct 2013 09:09:53 -0700
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1. Make sure that the cache is disabled in the guest (cache=none)
2. Look at the Redhat profiles ('tuned') for virtual-host which specifies the following sysctl knobs:


Having a higher dirty_ratio will cause larger amounts of I/O to be cached in memory - but it will also cause the I/O to hit the disk all at once and have un-even I/O patterns which could be causing the issues you are seeing.


On 2013-10-04 9:07 AM, Stephan von Krawczynski wrote:
Hi Peter,

I know the deadline stuff, this is already in. But the problem arises
nevertheless. My idea is that mv.dirty_ratio should be a lot higher to prevent
the lagging, probably around 80.

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