PROCESSOR-SDK-AM57X: Context switch latency

Part Number: PROCESSOR-SDK-AM57X

Hello,

Software: PROCESSOR-SDK-LINUX-RT-AM57X V04.03

Hardware: AM574X-IDK

I m measuring the overhead of context switch by lat_ctx which is mentioned on this page. The result show that it spends around 10~15us on context switch each time which is more than I expected. Is the number reasonable? If it is, do we have any ways to optimize the overhead? Like increasing CPU clock, or upgrade Linux version? Thanks for any comment.

root@am57xx-evm:~# uname -a
Linux am57xx-evm 4.9.65-rt23-g7069a470d5 #2 SMP PREEMPT RT Mon Mar 26 12:04:24 EDT 2018 armv7l GNU/Linux

root@am57xx-evm:~# ./lat_ctx -s 0 processes 2 4 8 16 20

"size=0k ovr=6.05
2 10.13
4 13.85
8 14.26
16 14.16
20 13.68
root@am57xx-evm:~# ./lat_ctx -s 0 processes 2 4 8 16 20

"size=0k ovr=6.14
2 10.25
4 13.12
8 14.34
16 14.65
20 14.32
root@am57xx-evm:~# ./lat_ctx -s 0 processes 2 4 8 16 20

"size=0k ovr=6.24
2 10.08
4 12.83
8 13.90
16 14.02
20 13.94