[pve-devel] [PATCH pve-qemu-kvm] vma: set cache unsafe for performance

Eneko Lacunza elacunza at binovo.es
Wed Jul 27 12:55:52 CEST 2016


El 27/07/16 a las 09:45, elacunza at binovo.es escribió:
> This patch is a follow-up to Alexandre's rbd patch, so that we set cache
> unsafe during restore for performance. This is the same done in qemu-img
> convert, which defaults to unsafe cache.
>
> In our fixed ceph cluster this has given us a x4 boost (from 15MB/s to
> 94MB/s) with a 44% sparse 10GB backup (network is 1gbit, gains could be
> higher)
>
Also note that I miscalculated performance boost, it is x6  :)


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