[Xen-devel] Re: [kvm-devel] [PATCH RFC 3/3] virtio infrastructure: example block driver

[Avi Kivity <avi@xxxxxxxxxxxx>]

Carsten Otte wrote:
> Troy Benjegerdes wrote:
>   
>> This kind of a claim needs some benchmark data to document it.
>>     
> We've implemented both for our vdisk driver on 390. At least on our 
> platform, merging in the host is preferable because vmenter/vmexit is 
> very fast and we would merge twice because we submit the result via 
> io_submit() system call from host userland.
>   


If a single hypercall can submit multiple requests, then this may work
well for the newcomer archs too.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to 
panic.


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