Anthony Liguori wrote:
> Rusty Russell wrote:
>> On Mon, 2006-06-19 at 09:19 -0700, Andrew Warfield wrote:
>>
>>> Attached to this email is a patch containing the (new and improved)
>>> blktap Linux driver and associated userspace tools for Xen. In
>>> addition to being more flavourful, containing half the fat, and
>>> removing stains twice as well as the old driver, this stuff adds a
>>> userspace block backend and let you use raw (without loopback), qcow,
>>> and vmdk-based image files for your domUs. There's also a fun little
>>> driver that provides a shared-memory block device which, in
>>> combination with OCFS2, represents a cheap-and-cheerful fast shared
>>> filesystem between multiple domUs.
>>>
>>
>> Hi Andrew,
>>
>> I like the idea of block servers in userspace, but I'm curious.
>> When I
>> wrote the simple share block server I couldn't see an obvious
>> justification for multiple outstanding requests (with AIO/threads and
>> all that entails),
>
> Are you thinking of posix-aio? posix-aio is "emulated" with threads and
> normal read/select calls. The performance isn't that great.
Hi,
We develop another implementation of posix I/O for linux with better
performance, based on linux kernel AIO, have a look at:
http://www.bullopensource.org/posix/index.html
Laurent
--
Laurent Vivier
Bull, Architect of an Open World (TM)
http://www.bullopensource.org/ext4
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