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From: Mostyn/Annabella <mrl@teleport.com>
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Subject: Kernels - cache - fast,slow,fast,slow
To: current@freebsd.org
Date: Sun, 1 Dec 1996 15:14:58 -0800 (PST)
Cc: mrl@teleport.com
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I've been seeing a frustrating speed difference between different current
kernels. We have a server - 133Mhz Pentium - running an old 2.2 current
from abount May which usually seemed a lot faster than succeeding ones.
So I did some investigation. Using the kernel routine, nfs_serv.c as
a benchmark and 4 kernels on a 133Mhz Pentium we got

Kernel from May - ~19 secs compile
Kernel from Oct 1 - ~31 secs
2.2-961014-SNAP kernel - ~19 secs
Yesterday's kernel (3.0) - ~31 secs

After much ***ting around I found that switching off the 512Kb Pipeline
cache left all of them at ~31 seconds!

So it seems that we are missing the hardware cache on some systems and not
on others. This shows as a significant difference.

Can anybody nail this one down?

Mostyn