Date: Tue, 02 Sep 1997 16:38:31 -0600 From: Steve Passe <smp@csn.net> To: Antti-Pekka Liedes <apl@mail.cs.hut.fi> Cc: freebsd-smp@FreeBSD.ORG Subject: Re: SMP performance on P5 systems? Message-ID: <199709022238.QAA01594@Ilsa.StevesCafe.com> In-Reply-To: Your message of "Wed, 03 Sep 1997 00:51:01 %2B0300." <19970903005101.00664@hutcs.cs.hut.fi>
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Hi, > > 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. --- > I was expecting the wall clock time to be less for the SMP kernel, also, > there seems to be quite a lot of system overhead :-/. Of course this > might be because of my relatively slow disks (I use striping on two > Quantum Fireballs, both on different channel of my AHA-3940U). The > benchmarks at www.freebsd.org SMP pages show a lot better performance. Is > it just that ppro beats pentium so much on SMP or what? I need to see the output from "mptable -dmesg > outfile" run shortly after boot. the 3940 is a bridged PCI card and many MP BIOS's fail to probe it properly. you might be missing INTs from one channel. -- Steve Passe | powered by smp@csn.net | Symmetric MultiProcessor FreeBSD
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