| Summary: | 945 XVideo uses 96% CPU time but old code use <30% when rotated | ||
|---|---|---|---|
| Product: | xorg | Reporter: | Barry Scott <barry.scott> |
| Component: | Driver/intel | Assignee: | Eric Anholt <eric> |
| Status: | VERIFIED FIXED | QA Contact: | Xorg Project Team <xorg-team> |
| Severity: | normal | ||
| Priority: | medium | CC: | hamish, zhenyu.z.wang |
| Version: | git | ||
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Bug Depends on: | 12243 | ||
| Bug Blocks: | |||
I am seeing this with MythTV when using the bob deinterlacer. When I modified the source to disabled the Textured Video xv adapter (leaving only the video overlay adapter) the problem went away. I updated to summary to make it clear that the problem I see if when rotated. Its interesting that Hamish sees a similar problem in the not rotated case. I have tested with xine using xv output on textured and using xshm. Both use the 96% CPU time. I've pushed some fixes for context switching in the driver, which included the removal of a bad sync wait that had been added to try to work around the context switching problems. Playing a random video on my disk with mplayer, rotated, I had <10% cpu usage total now. Eric, with your latest push, when I tried to play a VOB file from DVD movie, after running mplayer for some seconds, it would start to eat cpu to 99% as before. I think we're running into resource race here, that cpu produces more requests waiting space in ring buffer while graphics engine consumes slower than the request. So we wait (loop) too many times. I don't have a good idea on how to fix this now, I can think now is that if we start to wait for ring buffer space for new ring request, we should wait for whole or larger length of ring to dry. Or set some ratio value to detect if ring resource is low and need to wait for more space. With latest git I'm seeing no change in CPU load. normal rotation is low CPU and right rotation is very high. With the latest 2D driver and xserver source, after I rotate screen to right, I ran mplayer to play mpeg2 video by using xv driver, the cpu usage percent is <30%, so this bug should be gone. But because of bug #12243, I can not see any video image when using xv driver. After bug #12243 fixed, we can retest and close this bug. Now bug #11243 is fixed and the bug does not exist. |
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Use recent git I see Xorg using 96% CPU to show a basic MPEG2 720x576 that used to use <30% with the september 2006 modesetting branch driver code. The movie plays without dropping frames. This is an improvement of the git code from about a month ago that use 99% and the movie was playing slowly and dropping frames. The hardware is an HP7600U that has a Intel(R) Pentium(R) D CPU 2.80GHz running linux 2.6.21 in SMP. Here is the output of top when rotated: top - 11:38:00 up 19:34, 1 user, load average: 2.95, 1.81, 0.86 Tasks: 84 total, 4 running, 80 sleeping, 0 stopped, 0 zombie Cpu(s): 8.2% us, 1.3% sy, 0.0% ni, 90.1% id, 0.5% wa, 0.0% hi, 0.0% si Mem: 505924k total, 492204k used, 13720k free, 40596k buffers Swap: 2097144k total, 616k used, 2096528k free, 275072k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 20885 root 5 -20 283m 15m 12m R 99.2 3.2 3:12.70 Xorg 21031 root 10 -5 108m 23m 12m S 13.9 4.8 0:22.80 player_xine 21037 root 15 0 95240 20m 14m R 2.0 4.1 0:04.18 player_html_gtk 21041 root 5 -10 6484 3408 2672 S 2.0 0.7 0:00.71 player_text_scr 1 root 15 0 1748 604 520 S 0.0 0.1 0:00.85 init And here is the same work load when in normal: top - 11:39:50 up 19:36, 1 user, load average: 2.21, 1.93, 1.01 Tasks: 84 total, 3 running, 81 sleeping, 0 stopped, 0 zombie Cpu(s): 8.2% us, 1.3% sy, 0.0% ni, 90.1% id, 0.5% wa, 0.0% hi, 0.0% si Mem: 505924k total, 491948k used, 13976k free, 40784k buffers Swap: 2097144k total, 616k used, 2096528k free, 274972k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 21374 root 10 -5 108m 23m 12m S 11.9 4.8 0:01.67 player_xine 21242 root 0 -20 283m 15m 12m S 2.0 3.2 0:02.31 Xorg 1 root 15 0 1748 604 520 S 0.0 0.1 0:00.85 init