Hi,
Now, I meet some performance problem when test 4 cores SMP benchmark of
seL4bench on our platform.
Out platform is XXX, But I get the test data of IMX8MM_EVK_64 and TX2
platform from seL4 website, I think they are official statistics.
My test results below:
ARM
platform
Test item XXX IMX8MM_EVK_64
TX2
mean(Stddev)
500 cycles, 1 core 636545(46) 625605(29)
598142(365)
500 cycles, 2 cores 897900(2327) 1154209(44)
994298(94)
500 cycles, 3 cores 1301679(2036) 1726043(65)
1497740(127)
500 cycles, 4 cores 1387678(549) 2172109(12674) 1545872(109)
1000 cycles, 1 core 636529(42) 625599(22)
597627(161)
1000 cycles, 2 cores 899212(3384) 1134110(34)
994437(541)
1000 cycles, 3 cores 1297322(5028) 1695385(45)
1497547(714)
1000 cycles, 4 cores 1387149(456) 2174605(81)
1545716(614)
From these compare data:
1. When test smp bench on one core, the performance of several platform is
similar
2. When test smp bench on muti core, the result of IMX8MM_EVK_64 is beauty,
the result of 4 cores is 3.47 times as good as 1 core, I think it’s good
3. But the platform of TX2 has some different performance, the result of 2
cores is 1.66 times as good as 1 core, I still think is good, But the result of
3 cores almost have the same ping-pong count with 4 cores, why add one core,
the count result not add as our expected ?
4. The performance of our platform is badly, on our platform, the result of
3 cores almost also have the same ping-pong count with 4 cores, and our count
result of 4 cores just 2 times as good as one core, I think it is very bad
5. I want to know what are the possible causes of the badly performance
about our platform XXX and TX2 ?
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