[GLLUG] KVM Performance
kens at kensnet.org
Wed Jun 10 14:37:02 UTC 2020
Mike Brodbelt via GLLUG wrote:
> On 09/06/2020 22:52, Ken Smith via GLLUG wrote:
>> I can' t help thinking that there must be something more behind a
>> drop from 60MB/s to 15MB/s in write performance
> Can't speak to your exact bottleneck here, but I think I'd try and
> eliminate your disk hardware from the game for a start, to see what
> happens there.
> Try creating a null block device
> (https://www.kernel.org/doc/html/latest/block/null_blk.html), and then
> benchmark writes to that on the host and the guest. See what that does
> as a baseline....
Interesting - thanks for the tip. I measured 16.3 MB/s write to a null
block device on one of the guests.
Conclusion - that's as fast as that hardware can manage.
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