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smg	2008-03-05 , 22:51
Posts: 1 \| Thanked: 1 time \| Joined on Mar 2008	#63

Reminder of the importance of CPU clockspeed for the test...

As mentionned above, CPU clockspeed affect the tests. By default, the N810 is in the "ondemand" mode, so clock speed varies between the following frequencies as needed: 165000 266000 330000 400000. So depending on what is running on your n810 during the test, you may have different result.

Notice below the different results depending on the governor and whether the CPU is idle or not...

card used : /media/mmc1 1GB Sandisk 86%full (has one 800MB Godfather-II movie on it... which plays great by the way... no dropped frames at 400x224@800kbps... no dropped frames either @1500kbps... but not enough space... hence why I am reading this thread...)

Anyway, I did three runs and average is shown

Read (real time in s for 100M file)

Code:

[1] cpufreq=performance (400MHz) :    11.3s  (11.32 11.32 11.20)
[2] cpufreq=ondemand (CPU not idle) : 13.7s  (14.14 11.41 15.41)
[3] cpufreq=ondemand (CPU idle) :     21.4s  (21.88 21.35 21.05)
[4] cpufreq=powersave (165MHz) :      22.0s  (21.88 22.16 22.08)

Write (real time in s for 100M file)

Code:

[1] cpufreq=performance (400MHz) :    17.9s  (19.53 15.31 18.97)
[2] cpufreq=ondemand (CPU not idle) : 25.6s  (26.04 23.39 27.42)
[3] cpufreq=ondemand (CPU idle) :     25.5s  (30.33 19.26 26.80)
[4] cpufreq=powersave (165MHz) :      29.1s  (28.30 31.28 27.75)

[1] echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
[2] with DateBk5/GarnetVM running and using ~25% CPU... so CPU scales up once in a while
[3] mostly idle, CPU seems to stay at 165MHz during read test
[4] echo powersave > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

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