Date: Tue, 23 Dec 2008 11:22:02 +0100 From: Pieter de Goeje <pieter@degoeje.nl> To: freebsd-performance@freebsd.org Cc: Ivan Voras <ivoras@freebsd.org> Subject: Re: intel i7 and Hyperthreading Message-ID: <200812231122.02892.pieter@degoeje.nl> In-Reply-To: <giqce6$69o$1@ger.gmane.org> References: <200812192214.mBJMEj2Q009511@lava.sentex.ca> <giqce6$69o$1@ger.gmane.org>
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On Tuesday 23 December 2008, Ivan Voras wrote: > Mike Tancsa wrote: > > Just got our first board to play around with and unlike in the past, > > having hyperthreading enabled seems to help performance.... At least in > > buildworld tests. > > > > doing a make -j4 vs -j6 make -j8 vs -j10 gives > > > > -j buildworld time % improvement over -j4 > > 4 13:57 > > 6 12:11 13% > > 8 11:32 18% > > 10 11:43 17% > > Thanks for posting this! What's missing is build times with hyperthreading disabled. make buildworld -j10 could easily be faster than -j4 even when hyperthreading is disabled, because of increased disk I/O concurrency. 11:43 to build world is very fast indeed :-) -- Pieter de Goeje
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