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Date: Sun, 2 Mar 2003 12:24:51 -0800
From: William Lee Irwin III <wli@holomorphy.com>
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: percpu-2.5.63-bk5-1 (properly generated)
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At some point in the past, I wrote:
>>> Tested, boots, and runs on NUMA-Q. Trims 6s of 41s off kernel compiles.

On Sun, Mar 02, 2003 at 10:24:37AM -0800, Martin J. Bligh wrote:
> Odd. I get nothing like that difference.
> Kernbench-2: (make -j N vmlinux, where N = 2 x num_cpus)
>                               Elapsed        User      System         CPU
>               2.5.63-mjb2       44.43      557.16       95.31     1467.83
>       2.5.63-mjb2-pernode       44.21      556.92       95.16     1474.33
> Kernbench-16: (make -j N vmlinux, where N = 16 x num_cpus)
>                               Elapsed        User      System         CPU
>               2.5.63-mjb2       45.39      560.26      117.25     1492.33
>       2.5.63-mjb2-pernode       44.78      560.24      112.20     1501.17
> No difference for make -j32, definite improvement in the systime for -j256.

Maybe your machine's running slow?
AFAIK the machines we're using are identical, and mine sees:

make -j bzImage > /dev/null  317.70s user 148.43s system 1295% cpu 35.984 total
(yes, this is 5 off of 41s, apparently 1s measurement variations are typical)

make -j36 bzImage > /dev/null  302.33s user 115.02s system 1284% cpu 32.492 total
make -j38 bzImage > /dev/null  302.52s user 117.06s system 1300% cpu 32.258 total
make -j40 bzImage > /dev/null  303.53s user 117.42s system 1305% cpu 32.251 total
make -j44 bzImage > /dev/null  304.02s user 122.14s system 1299% cpu 32.792 total

Check MTRR's etc.?


-- wli