Date: Sun, 1 Dec 1996 15:14:58 -0800 (PST) From: Mostyn/Annabella <mrl@teleport.com> To: current@freebsd.org Cc: mrl@teleport.com Subject: Kernels - cache - fast,slow,fast,slow Message-ID: <199612012314.PAA08974@linda.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
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