Re: CVS commit: src/sys/kern

[Masao Uebayashi <uebayasi%tombi.co.jp@localhost>]

On Wed, Nov 10, 2010 at 10:27:50AM -0600, David Young wrote:
> On Tue, Nov 09, 2010 at 12:36:16PM +0900, Masao Uebayashi wrote:
> > The root cause of such a problem is, we don't do I/O scheduling at all.
> > 
> > I think that pool(9) (and pool_cache(9)) is a great tool to manage
> > limited resources.  The way to go would be to extend it to manage
> > bandwidth in I/O subsystems.  (We already use pool_cache(9) for
> > KVA.)
> > 
> > Resources are shared, and have dependencies.  I/O resources would
> > look like some hierachical structure chained with pool backend
> > callbacks.  Probably combined with device tree too.
> 
> FWIW, I'm working on managing PCI I/O resources in this way, but I'm
> probably going to use vmem(9), not pool(9).

That is PCI I/O *space*, right?  I agree vmem(9) is suitable for that.

What I meant is I/O descriptors like mbuf or struct buf.  Something like
altq generalized for I/O queues.

> 
> Dave
> 
> -- 
> David Young             OJC Technologies
> dyoung%ojctech.com@localhost      Urbana, IL * (217) 278-3933

-- 
Masao Uebayashi / Tombi Inc. / Tel: +81-90-9141-4635