On Tue, Apr 20, 2004 at 10:38:37AM +0300, Rumen Telbizov wrote: > Hello, > > On Mon, Apr 19, 2004 at 02:35:23AM -0700, Kris Kennaway wrote: > > On Mon, Apr 19, 2004 at 11:20:52AM +0200, Morten A. Middelthon wrote: > > > sysctl -w machdep.hlt_logical_cpus=0 > > > > > > that did the trick. I added it to loader.conf as well. > > > > > > regards, > > > > Note that HTT causes worse performance in many workloads, which is why > > that sysctl defaults to off. > > Would you please point out some cases when HTT with machdep.hlt_logical_cpus=0 > causes worse performance than machdep.hlt_logical_cpus=1? > I am using an HTT Xeon since recently and in my tests it showed that > machdep.hlt_logical_cpus=0 is better! > A simple ubench (spawning 2 processes) gives better results in 0 mode!
My parallel package builds are slower on build machines with HTT. It's not a magic bullet. Kris
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