Subject: Re: Profile data from nbwww
To: Thor Lancelot Simon <>
From: Alfred Perlstein <>
List: tech-perform
Date: 12/11/2004 15:08:30
* Thor Lancelot Simon <> [041211 15:03] wrote:
> Profiling data from the kernel on, covering a period of
> a few days beginning just after the 2.0 release, can be found at
> There aren't really any major surprises.  The heaviest hitter turns out
> to be pvtree_SPLAY, called from the pmap code of course.  One thing I
> am wondering is if the splay routines could be optimized with MD code?

That makes sense.

Another possible optimization, I always wondered if not splaying when
the depth traversed is below some threshhold, say 2 or 3, that would
compromise a working set and reduce the write traffic to memory caused
by balancing the tree.

- Alfred Perlstein
- Research Engineering Development Inc.
- email: cell: 408-480-4684