Date: Thu, 7 Jun 2007 18:15:13 +1000 (EST) From: Bruce Evans <brde@optusnet.com.au> To: Bruce Evans <brde@optusnet.com.au> 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 Message-ID: <20070607180257.P7767@besplex.bde.org> In-Reply-To: <20070607163724.M7517@besplex.bde.org> References: <200706051420.l55EKEih018925@repoman.freebsd.org> <3bbf2fe10706050829o2d756a4cu22f98cf11c01f5e4@mail.gmail.com> <3bbf2fe10706050843x5aaafaafy284e339791bcfe42@mail.gmail.com> <200706051230.21242.jhb@freebsd.org> <20070606094354.E51708@delplex.bde.org> <20070605195839.I606@10.0.0.1> <20070606154548.F3105@besplex.bde.org> <20070607133524.S7002@besplex.bde.org> <b1fa29170706062324p793ac8e2ga8dc5bf8ba151a60@mail.gmail.com> <20070607163724.M7517@besplex.bde.org>
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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
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