Beagleboard xM - Bogomips are very low
Hi,
On a Beagleboard xM rev. B, I noticed that vanilla kernel 3.4.6 have the folowing bogomips for 300MHz and 800 MHz operations: 262.08 and 700.57.
With kernel 3.7.10, I have : 175.65 and 467.41 bogompis.
Any idea why bogomips are so low now?
Guillaume
Quoted 7 lines · Guillaume Gardet
Hi,
On a Beagleboard xM rev. B, I noticed that vanilla kernel 3.4.6 have the folowing bogomips for 300MHz and 800 MHz operations: 262.08 and 700.57.
With kernel 3.7.10, I have : 175.65 and 467.41 bogompis.
Any idea why bogomips are so low now?
using my DTS cpufreq series (which I am about to post to linux-omap):
https://github.com/nmenon/linux-2.6-playground/commits/push/cpufreq-cpu0-omap-all-v2
and a test script:
http://pastebin.com/zrr8ptge
I See (3.9-rc3):
http://pastebin.com/4JCV3dnX
bogomips@ boot:
BogoMIPS : 395.67
Boot scaling frequency =600000
TESTING for 1 seconds at 300000 current scaling frequency(for 300000) =300000 bogomips@ frequency 300000:
BogoMIPS : 197.83
TESTING for 1 seconds at 600000 current scaling frequency(for 600000) =600000 bogomips@ frequency 600000:
BogoMIPS : 395.67
TESTING for 1 seconds at 800000 current scaling frequency(for 800000) =800000 bogomips@ frequency 800000:
BogoMIPS : 527.56
Signature · 2 lines
Regards, Nishanth Menon
Quoted 9 lines · Guillaume Gardet
Hi,
On a Beagleboard xM rev. B, I noticed that vanilla kernel 3.4.6 have the folowing bogomips for 300MHz and 800 MHz operations: 262.08 and 700.57.
With kernel 3.7.10, I have : 175.65 and 467.41 bogompis.
Any idea why bogomips are so low now?
I believe this is the reason for the BogoMIPS change:
http://www.spinics.net/lists/arm-kernel/msg221672.html
It looks like BogoMIPS reporting changed because of the delay routine patch introduced in 3.6. So the change in BogoMIPS is real, but should not be a concern.
frank agius
Quoted 7 lines
Guillaume
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Quoted 8 lines · Frank Agius
Quoted 7 lines · Guillaume Gardet
Hi,
On a Beagleboard xM rev. B, I noticed that vanilla kernel 3.4.6 have the folowing bogomips for 300MHz and 800 MHz operations: 262.08 and 700.57.
With kernel 3.7.10, I have : 175.65 and 467.41 bogompis.
Quoted 8 lines
Quoted 2 lines
Any idea why bogomips are so low now?
I believe this is the reason for the BogoMIPS change:
http://www.spinics.net/lists/arm-kernel/msg221672.html
It looks like BogoMIPS reporting changed because of the delay routine patch introduced in 3.6. So the change in BogoMIPS is real, but should not be a concern.
Thanks for the pointer. So, it should not affect performances. I will try to bench it, to be sure there is no hidden problem.
Thanks.
Guillaume
Quoted 12 lines
frank agius
Quoted 7 lines
Guillaume
Signature · 3 lines
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