Re: [Xen-devel] [PATCH] Blktap: Userspace file-based image support. (RFC)

[Rusty Russell <rusty@xxxxxxxxxxxxxxx>]

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), so I went for the trivial single request approach.
It seems to me that the backend doesn't have much information the front
end doesn't have.

Just wondered if you'd tried a naive approach first...

Thanks!
Rusty.
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