From owner-cvs-src@FreeBSD.ORG  Thu Jun  7 08:15:23 2007
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Date: Thu, 7 Jun 2007 18:15:13 +1000 (EST)
From: Bruce Evans <brde@optusnet.com.au>
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Cc: src-committers@FreeBSD.org, John Baldwin <jhb@FreeBSD.org>,
	Kip Macy <kip.macy@gmail.com>, cvs-all@FreeBSD.org,
	Attilio Rao <attilio@FreeBSD.org>, cvs-src@FreeBSD.org,
	Kostik Belousov <kostikbel@gmail.com>,
	Jeff Roberson <jroberson@chesapeake.net>
Subject: Re: cvs commit: src/sys/kern kern_mutex.c
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On Thu, 7 Jun 2007, Bruce Evans wrote:

> (Cold client):
>      834.39 real      1300.21 user       192.19 sys
>   1323006  voluntary context switches
>   1526348  involuntary context switches
> ...
> This is with 4BSD, no PREEMPTION, and pagezero disabled.  With the
> ...
> The next run will have pagezero resetting its priority when this priority
> gets clobbered.

That gave only mainly more voluntary context switches (13.5+ million instead
of the best observed value of 1.3+ million or the value of 2.9+ million
without priority resetting.  It reduced the pagezero time from 30 seconds to
24.  It didn't change the real time significantly.

Bruce