Re: pipe structure and KVM caching patch

[Hiten Pandya <hmp@xxxxxxxxxxxxx>]

Matthew Dillon wrote:

>     I've done a first pass at improving pipe creation and teardown latencies
>     and reducing kmem operations (which are nasty on SMP systems).  I added
>     a per-cpu cache of pipe structures and I retain VM object and kmem
>     mappings in the cached pipe structures.  Everything can be monitored
>     and some params modified via the kern.pipe sysctl.  It is untuned but
>     still represents a good first-order solution.  The cache eats around 1MB
>     of KVM (virtual, not real memory) per cpu under heavy load.
>
>     I haven't had any problems testing it so far but more testing can't
>     hurt.  The patch can be retrieved at:
>
> 	fetch http://apollo.backplane.com/DFlyMisc/pipe01.patch

	The change to sys/pipe.h seems cosmetic, right?  Shouldn't those
	be made separately?

		-- Hiten