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

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 

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