linux-kernel - Re: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio block device

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Message-ID: <4E3673E3.6020100@redhat.com>
Date:	Mon, 01 Aug 2011 12:37:39 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Liu Yuan <namei.unix@...il.com>
CC:	Sasha Levin <levinsasha928@...il.com>,
	Stefan Hajnoczi <stefanha@...il.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Khoa Huynh <khoa@...ibm.com>,
	Badari Pulavarty <pbadari@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio block
 device

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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