Re: bogomips discrepancy on Intel Core2 Quad CPU

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On Mon, 3 Sep 2007, Bill Davidsen wrote:

Bauke Jan Douma wrote:
$> uname -a
Linux skyscraper 2.6.22.5 #7 SMP PREEMPT Sun Sep 2 12:12:25 CEST 2007 i686 GNU/Linux

$> cat /proc/cpuinfo | grep bogomips
bogomips    : 4813.46
bogomips    : 4810.91
bogomips    : 4810.91
bogomips    : 10583.94

The latter seems way off base.
Prod me for more info.

I see this occasionally on a dual, speedstep (or similar) finds a way to throttle down the cores under light load. I suspect that if you load the system:

 for n in 1 2 3 4; do
   nice -19 bash -c 'while true; do a=$RANDOM; done' &
 done

Then you should see your bogomips rise on all cores.


bjd

	[... copy of output snipped, see the O.P. ...]

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Bill Davidsen <[email protected]>
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$ uname -a
Linux p34.internal.lan 2.6.22 #2 SMP Mon Jul 16 18:40:31 EDT 2007 x86_64 GNU/Linux

$ cat /proc/cpuinfo | grep bogomips
bogomips        : 4797.72
bogomips        : 4795.16
bogomips        : 4795.21
bogomips        : 4795.19

Mine is fine, not using any speedstep here.

Justin.
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