Date: Thu, 23 Jul 2009 13:22:00 +0100 From: RW <rwmaillists@googlemail.com> To: freebsd-questions@freebsd.org Subject: Re: ULE and Prescott question Message-ID: <20090723132200.4cf4002e@gumby.homeunix.com> In-Reply-To: <h47t3h$a69$1@ger.gmane.org> References: <200907221157.n6MBvpKf028533@mp.cs.niu.edu> <h47t3h$a69$1@ger.gmane.org>
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On Wed, 22 Jul 2009 22:33:46 +0200 Ivan Voras <ivoras@freebsd.org> wrote: > Scott Bennett wrote: > > This is a curiousity question. I'm running 7.2-STABLE at > > present on an old Inspiron XPS, which has a 3.4 GHz P4 Prescott > > CPU. I have hyperthreading enabled in the kernel. The question > > is: is there any appreciable performance difference to be expected > > with this hardware setup between the ULE scheduler and the 4BSD > > scheduler? Or does the fact that there is only one core eliminate > > any difference in performance characteristics? > > I'd guess the second thing. It's not like there's cache to be shared > between cores, etc. But with hyperthreading enabled, don't you have virtual CPUs sharing L1 cache rather that cores sharing L2 cache, making the case for ULE even stronger?
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