Date: Wed, 3 Sep 1997 11:49:52 +0000 (GMT) From: Alfred Perlstein <perlsta@fang.cs.sunyit.edu> To: Antti-Pekka Liedes <apl@mail.cs.hut.fi> Cc: Steve Passe <smp@csn.net>, freebsd-smp@FreeBSD.ORG Subject: Re: SMP performance on P5 systems? Message-ID: <Pine.BSF.3.95.970903114840.17682A-100000@fang.cs.sunyit.edu> In-Reply-To: <19970903102141.63694@hutcs.cs.hut.fi>
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What kind of drive technology are you using? non-busmastering IDE will kill your perforance won't it? > > > The current SMP performance on my Tyan Tomcat IIID dual pentium 200MMX > > > system is not quite what I had expected, as a simple benchmark, this is > > > what it takes for me to compile kernel, with UP kernel: > > > make -j3 283.19s user 32.56s system 94% cpu 5:32.83 total > > > and with SMP: > > > make -j3 341.23s user 134.72s system 183% cpu 4:18.80 total > > > > try -j16, using just 3 processes are leaving you diskbound. > > > > -j12 or -j16 didn't give any practical differences: > text data bss dec hex > 1142784 98304 347076 1588164 183bc4 > make -j16 349.22s user 129.98s system 189% cpu 4:12.77 total > > I guess it's just so heavily disk bound operation that SMP doesn't give > much edge compared to UP.
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