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Date: Sat, 3 Jun 1995 01:53:04 -0400
From: Temptation <temp@temptation.interlog.com>
Subject: Re: A performance mystery
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
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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/
>