[Sheepdog] Sheepdog performance

[Haven]

I'm seeing higher results with cache=writeback.

A few comparison runs show thats there's a decent bit of variation per run:
writeback: 41.1, 41.2, 39.3, 39.7, 39.1
none: 42.2, 33.3, 35.2, 30.4, 30.6

I know these tests are not very conclusive but I'm not seeing a huge
difference between the two cache modes.

> On 05/04/11 18:55, Chris Webb wrote:
>>    -drive file=sheepdog:test,if=ide,index=0
>>
>> I'm only getting around 5MB/s with the same write test.
>
> Try cache=none in your drive declaration, I noticed similar I/O
> performance even with LVM backed volumes in recent KVM, until I disabled
> the cache.
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