Linux/PROCESSOR-SDK-AM335X: Weston performance issue

You will need to check if CPU is bottleneck or 3D graphics hardware accelerator. To check load on 3D graphics accelerator, please use the PVR tools.

To see CPU load, you can always use "top" cmd.

To check CPU frequency -

1. Change the governor to "performance". By default it is "ondemand" so when the CPU is doing nothing, you’ll see 300MHz. When you have a lot of activity, you’ll see max cpu speed.

#echo performance /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

2. Verify the governor mode

#root@am335x-evm:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_governor

performance

#cat/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq

Thanks your reply !

To Run Top,I got this :

top - 15:28:28 up 6 min, 1 user, load average: 0.00, 0.16, 0.11
Tasks: 98 total, 1 running, 97 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.5 us, 0.5 sy, 0.0 ni, 99.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 508100 total, 396292 free, 37680 used, 74128 buff/cache
KiB Swap: 20476 total, 20476 free, 0 used. 447224 avail Mem

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
723 root 20 0 3152 1820 1388 R 0.7 0.4 0:00.30 top
17 root 20 0 0 0 0 S 0.2 0.0 0:00.39 kworker/0:1
1 root 20 0 5204 3884 2720 S 0.0 0.8 0:03.87 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/0
4 root -2 0 0 0 0 S 0.0 0.0 0:00.16 ktimersoftd/0
6 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H
8 root -2 0 0 0 0 S 0.0 0.0 0:00.07 rcu_preempt
9 root -2 0 0 0 0 S 0.0 0.0 0:00.00 rcu_sched
10 root -2 0 0 0 0 S 0.0 0.0 0:00.00 rcub/0
11 root -2 0 0 0 0 S 0.0 0.0 0:00.17 rcuc/0
12 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kswork
13 root rt 0 0 0 0 S 0.0 0.0 0:00.00 posixcputmr/0
14 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kdevtmpfs
15 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 netns
16 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/26-44e07000
18 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/59-4804c000
19 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/92-481ac000
20 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/125-481ae00
21 root 20 0 0 0 0 S 0.0 0.0 0:00.00 oom_reaper
22 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 writeback
23 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kcompactd0
24 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 crypto
25 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 bioset
26 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kblockd
27 root -51 0 0 0 0 S 0.0 0.0 0:00.13 irq/20-49000000
28 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/22-49000000
29 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 edac-poller
30 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 watchdogd
31 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 rpciod
32 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 xprtiod
33 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kswapd0
34 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 nfsiod
43 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kpcitest
44 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/180-4831000
45 root -51 0 0 0 0 S 0.0 0.0 0:00.25 irq/176-tilcdc
46 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/175-4808000
47 root 20 0 0 0 0 S 0.0 0.0 0:00.04 kworker/u2:1
49 root -51 0 0 0 0 S 0.0 0.0 0:00.03 irq/172-4a10000
50 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/173-4a10000
51 root -51 0 0 0 0 S 0.0 0.0 0:00.24 irq/161-mmc0
52 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/140-4806000
53 root 20 0 0 0 0 S 0.0 0.0 0:00.09 kworker/0:2
54 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 ipv6_addrconf
55 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/177-gpmc
56 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/159-44e0b00
57 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/160-4802a00
59 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 bioset
60 root 20 0 0 0 0 S 0.0 0.0 0:00.89 mmcqd/0
62 root 0 -20 0 0 0 S 0.0 0.0 0:00.12 kworker/0:1H
63 root 20 0 0 0 0 S 0.0 0.0 0:00.03 jbd2/mmcblk0p2-
64 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 ext4-rsv-conver
85 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 cryptodev_queue
92 root 20 0 10556 2608 2392 S 0.0 0.5 0:01.26 systemd-journal
95 root 20 0 10972 2624 2028 S 0.0 0.5 0:01.11 systemd-udevd
100 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kworker/u2:2
145 systemd+ 20 0 12408 1660 1416 S 0.0 0.3 0:00.11 systemd-timesyn
173 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/187-4740000
182 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/169-rtc0
188 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/170-rtc0
202 root 20 0 1952 1144 1088 S 0.0 0.2 0:00.12 syslogd
206 root 20 0 2324 1444 960 S 0.0 0.3 0:00.02 crond



I check this path"/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor" but I am not found this file.


ls /sys/devices/system/cpu/cpu0/
crash_notes crash_notes_size of_node power subsystem topology uevent

Did I missed some configuration in kernel?

In this afternoon :
I switch to ti-processor-sdk-linux-am335x-evm-04.03.00.05-Linux-x86-Install.bin,not before rt version.
I found the cpufreq path and file /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor.
I got CPU freq throuth cmd "cat/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq".
The result is 1000000,Its ok.this is not a issue.

by the way ,
I switch LCD to it's default 800x480.
run cmd:"weston-simple-egl ",still got 31 fps,not 60 fps I hoped.
Why ? In your nomal machine, how much you get to run command "weston-simple-egl ". this is realy a problem ?

root@am335x-evm:~# weston-simple-egl
wlpvr: PVR Services Initialised
156 frames in 5 seconds: 31.200001 fps
155 frames in 5 seconds: 31.000000 fps
155 frames in 5 seconds: 31.000000 fps
155 frames in 5 seconds: 31.000000 fps

Thanks very much !
I down PVRTune and checked. but do not find any thring wrong. the max fps is about 20 ;
But when I try run my app in -platform eglfs .Use PVRTune I got about 60 fps . I think mybe in weston enviroment some thing is not right.

so i decision run my app in use "-platform eglfs".if you have any suggest,please tell me !
thanks again!

Hi Lin,

lin yang39 said:

I down PVRTune and checked. but do not find any thring wrong. the max fps is about 20 ;

Did you mean to say that using PVRTune tool, you do not find SGX as bottleneck?

Does your application need to use weston manager or can work in full screen mode?

Is this your own application running at full 60 fps when using eglfs vs 20 fps when using Weston?  

Yes, I do not find SGX as bottleneck. Maybe I'm not good at using it.
my application running at full 60 fps,but 20 fps when using weston.
my application use full screen mode.
to me , weston is not neccessary.

ok,thanks very much