JPG decoding latency

[bakwc]

Hi! I have a huge JPG decoding latency. When decoding 150 KB, 2560x1440 jpeg file I get 63ms latency. For 1MB jpeg file I get 150ms latency. Is normal? I expect 1-10ms latency from hardware accelerated decoder, is it possible?

./mpi_dec_test -i img.jpg -t 8 -w 2560 -h 1440 -o result.bin
vpu_api: dlopen vpu lib failed
[info] jpg file loaded, size: 127406
mpi_dec_test start
mpp_rt: NOT found ion allocator
mpp_rt: found drm allocator
mpi_dec_test decoder test start w 2560 h 1440 type 8
mpi: mpp version: 1ffa5af1 author: JMCC Fix CPU detection
jpg cpy: 1ms
jpg enqueue: 1ms
mpp_dec: mpp_dec_advanced_thread slot size 7372800 is not equal to buffer size 14745600
mpp_dec: Assertion slot_size == buffer_size failed at mpp_dec_advanced_thread:834
jpg poll: 63ms
jpg dequeue: 63ms
jpg task: 63ms
Decode time: 63ms

BTW, libjpeg-turbo on the same image takes only 37ms.

[HermanChen]

The hardware has performance limit on huffman decoding. So when stream is larger then the decoding time is longer. You can check the hardware timing: echo 0x100 > /sys/modules/rk_vcodec/parameters/mpp_dev_debug

[bakwc]

I run it: echo 0x100 > /sys/module/mpp_dev_common/parameters/mpp_dev_debug Nothing in logs or dmesg. (I'm using old mpp version).

[HermanChen]

the directory under /sys/modules may be vpu_service or rk_vcodec, please ls and try