Date: Thu, 29 Dec 2005 10:48:16 -0500 From: Martin Cracauer <cracauer@cons.org> To: Kiffin Gish <kiffin.gish@planet.nl> Cc: freebsd-questions@freebsd.org Subject: Re: Using SCHED_ULE vs. SCHED_4BSD ... Message-ID: <20051229104816.B581@cons.org> In-Reply-To: <1135855260.1034.5.camel@localhost>; from kiffin.gish@planet.nl on Thu, Dec 29, 2005 at 12:21:00PM %2B0100 References: <1135855260.1034.5.camel@localhost>
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Kiffin Gish wrote on Thu, Dec 29, 2005 at 12:21:00PM +0100: > I recently upgraded from 5.4 to 6.0 and noticed the introduction of > option SCHED_ULE for supporting multi-processor environments. > > However, I understood that using SCHED_ULE with only one CPU can also > improve performance significantly. > > Is this true, and if so, what are the risks involved dropping good old > SCHED_4BSD for the new-and-improved scheduler? I have not even noticed an increase in performance from ULE when running my benchmark suite on a two-processor system. Some people say ULE has problems, but mostly on high CPU counts. So it probably doesn't matter either way. Martin -- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Martin Cracauer <cracauer@cons.org> http://www.cons.org/cracauer/ FreeBSD - where you want to go, today. http://www.freebsd.org/
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