Date: Sat, 3 Jun 1995 01:53:04 -0400 From: Temptation <temp@temptation.interlog.com> To: Charles Henrich <henrich@crh.cl.msu.edu> Cc: Robert Shady <rls@kilroy.id.net>, henrich@crh.cl.msu.edu, rgrimes@gndrsh.aac.dev.com, freebsd-hackers@freebsd.org Subject: Re: A performance mystery Message-ID: <Pine.3.89.9506030146.A17050-0100000@temptation.interlog.com> In-Reply-To: <199506030536.WAA29882@freefall.cdrom.com>
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Question, are the scsi controllers the same??? also what are the chipsets, are they the same? and by chance is anything being run on machine and not other? (eg. I have onboard NCR pci and Adaptec 2940 on one motherboard, and when I do a test under dos, with the same harddrive, the Adaptec 2940 blows the NCR out of the water) On Sat, 3 Jun 1995, Charles Henrich wrote: > > I missed the original message, but I'm guessing this is to an MFS mounted > > files system? Or what.. > > Here's the situation, I have a Compaq Prolinea 575 (75mhz Pentium) w/ 24mb ram, > and a 3gig Seagate ST3400N (number may be a tad off) drive. I also have a > Micron P90 Powerstation w/ 64mb ram, and a brand new connor drive. The Compaq > will compile a kernel in 8:30 that takes the Micron 9:30. My question was, did > anyone have any idea why this is? I just re-ran all the tests and here is the > results (slightly different kernel config) > > Compaq Proliant 575 Micron P90 Powerstation > > time make 8:55 9:39 > ram-speed 10.85 Mb/S, 7.08 Mb/S 10.61 Mb/S, 20.66 Mb/S > iozone 200 2486434/4150208 2446772/4203499 > iozone 16 8192 3360694/2677660 2711469/13256071 > > The make time is wall time, ram-speed tests the raw memory bandwidth, defeating > cache almost 100%. iozone 200 tests raw read/write performance to disk, as it > far exceeds ram size, memory cache effect is insignificant. iozone 16 8192 > tests the memory speed with cache involved, because the test size is so small, > (as Rod pointed out) its essentially just a bunch of bcopy's. > > As you can see by the ram-speed and iozone tests (and the fact that its a > Pentium-75!) the Compaq should be sorely beaten in build time over the Micron, > but yet its not. Hence the mystery. > > -Crh > > Charles Henrich Michigan State University henrich@crh.cl.msu.edu > > http://rs560.msu.edu/~henrich/ >
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