DragonFly kernel List (threaded) for 2013-03
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Re: Google Summer of Code
On Tue, Mar 05, 2013 at 03:15:12PM +0530, Mohit Dhingra wrote:
>*Hi Venkatesh,*
>
>Thanks a lot for a nice explanatory mail!
>
>I found the second project quite interesting, just to repeat --
>** virtio-blk currently 'kicks' the host VMM directly from its
> strategy() routine; it may make sense to defer this to a taskqueue. This
> is a tiny change, but understanding the performance implications may
> take a bit longer.
>
>As per my understanding, the notification to host through kick() involves
>the exit of the guest (as per attached paper). Hence, the aim for this
>project would also be to minimize the exits, or rather instantaneous exits.
>Deferring it to the task queue should definitely help. Other things that
>can be done in this project is batching of the buffers before kick() and
>dynamically deciding how many buffers can be batched together.
>
>Also, not all of the times deferring the 'kick' to taskqueue might not be a
>good idea. Finding those scenarios would be interesting where it helps, and
>where it is merely an overhead.
Yep, your understanding is correct.
QEMU and friends generally try to handle batches of requests per-VMexit,
so sometimes (often) there are wins to deferred 'kicks'.
On Mon, Mar 11, 2013 at 09:42:08PM +0530, Mohit Dhingra wrote:
> Hi Venkatesh,
> Will you be able to mentor this project? I actually wanted to get
> some
> more info and hands on before applying for GSoC project. Please also
> check
> the previous mail and my proposal.
I'd be happy to mentor a project to work on performance of DFly under
virtualization (KVM or w/e), but this alone would be too small for a
full GSoC project, I think. Working on a few of the aspects I mentioned
earlier (or anything you come up with! very strongly encouraged!) would
be a better fit for a full project.
Take care,
-- vs;
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