Re: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio blockdevice

[Avi Kivity]

On 08/01/2011 12:18 PM, Liu Yuan wrote:
> > Agree.  vhost-net works around the lack of async zero copy networking 
> > interface.  Block I/O on the other hand does have such an interface, 
> > and in addition transaction rates are usually lower.  All we're 
> > saving is the syscall overhead.
>
> Personally I too agree with Sasha Levin. But vhost-blk is the first 
> fast prototype that is supposed to act as a code base to do further 
> optimisation, which I plan to utilize  kernel's internal stuff like 
> BIO layer,  that can not be accessed from user space, to maximize the 
> performance for raw disk based block IO.

Is there anything in the bio layer which is not exposed by linux-aio?  
Or is linux-aio slow in translating from vfs ops to bio ops?

--
error compiling committee.c: too many arguments to function

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