On Sat, Oct 08, 2005 at 05:32:10PM +0100, Chris Lightfoot wrote:
> Jeff Dike also has an AIO reimplementation of UBD in the
> works, but I haven't had a chance to look at it yet.
Why don't you look at UML with the AIO stuff applied? It's pretty certain
that the one-at-a-time pseudo-AIO gives you close to synchronous
performance when you have a lot of IO. The AIO work is intended to
fix that, and if it doesn't, I like to know why.
If you do want to play with the current stuff, I think you can wash
out the effects of the pseudo-AIO stuff by slowing down the host and
having it do symchronous I/O. If there is still a major difference
between UML and the host, it would be interesting to know why.
Jeff
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