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Native Linux KVM tool v2Native Linux KVM tool v2Posted Jun 17, 2011 11:41 UTC (Fri) by Darkmere (subscriber, #53695)In reply to: Native Linux KVM tool v2 by aliguori Parent article: Native Linux KVM tool v2
Frankly, even when using virt-install I'm never certain if it's the right speed or not. Mostly _io_ tends to send systems into 20+ load "wait until world peace happens" even with (supposedly?) virtio enabled.
the current state of qemu-kvm is at times, a headache to deal with.
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Speeding up qemu-kvm Posted Jun 17, 2011 22:04 UTC (Fri) by jrn (subscriber, #64214) [Link]
Based on
> Some block drivers perform badly with cache=writethrough, most notably, qcow2. If performance is more important than correctness, cache=writeback should be used with qcow2.
I switched to cache=unsafe, and life became way better. The kind of tests I do in VMs let me recreate the image if there's a sudden crash, so safety is not such a worry. Not sure if virt-install does something like that.
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