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Date: Wed, 27 Feb 2008 16:47:40 -0800 (PST)
From: Kenneth Crudup <kenny/panix.com>
Subject: [TuxOnIce-devel] "How to Slow Down Your Computer Needlessly", a guide :)
For some reason, I thought the Intel 760 processor ("Dothan" technology,
2.0GHz speed, 533MHz FSB) was a Pentium 4 architecture, so when building
my kernels, would select CONFIG_MPENTIUM4. Performance, esp. on multi-
threaded applications, seemed sluggish.
Turns out that this chip's merely a Pentium M (CONFIG_MPENTIUMM),
so the calculations to determine the cache-line size in the memory-management
routines (and other places) was off by a factor of two larger so I was no doubt
getting cacheline misses some 50% of the time- not to mention the kernel
was using P4 optimizations (and maybe even instructions but I never
got BUG()s/OOPSes) on a P3-arch CPU.
The machine is visibly more responsive now. I'd been running that
way for probably over a year.
Kenneth R. Crudup Sr. SW Engineer, Scott County Consulting, Los Angeles
O: 3630 S. Sepulveda Blvd. #138, L.A., CA 90034–6809 (888) 454–8181
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