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High CPU usage of Xorg and Mythfontend
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Author:  gysmayo [ Sun Apr 08, 2007 7:55 pm ]
Post subject:  High CPU usage of Xorg and Mythfontend
Hello,

I'm a bit desperate at the moment about this issue. After I switched to R5E50 the xorg and the mythtv process is using alot of CPU time when playback a recording.

Code:
top - 03:30:07 up 57 min,  1 user,  load average: 0.87, 0.44, 0.55
Tasks: 100 total,   1 running,  98 sleeping,   0 stopped,   1 zombie
Cpu(s): 96.0%us,  3.3%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.3%hi,  0.3%si,  0.0%st
Mem:   1033072k total,  1015812k used,    17260k free,    48440k buffers
Swap:  1461904k total,        4k used,  1461900k free,   628232k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 6086 root       3   0  346m  78m  10m S 67.6  7.8   1:47.16 Xorg
 6131 mythtv     0   0  267m 127m  28m S 31.2 12.7   3:19.83 mythfrontend


so about all my CPU power goes to the playback of my video.

My System Specs:

CPU: Intel(R) Celeron(R) CPU 2.93GHz
Memory: 1024Mb
PVR: Hauppauge PVR-150
Hauppauge PVR-500 (x 2)
VideoCard: Gigabyte ATI X1600
Storage: Sata drives (LVM volumes)

I tried installing several different videocard still the same problem. I'm not playing HD just plain old PAL-B

Part of my xorg.conf

Code:
Section "Monitor"
        Identifier      "Monitor0"
        Option  "DPMS"  "true"
        Option  "TVStandard" "PAL-B"
        Option  "ConnectedMonitor" "TV"
        Option  "TVOutFormat" "SVIDEO"
        Option  "NoLogo" "1"
        Option  "TVOverScan" "0.8"
        Option "UseEdidDpi" "FALSE"
        Option "DPI" "100 x 100"
#       HorizSync    28.0 - 78.0 # Warning: This may fry very old Monitors
        HorizSync    30.0 - 50.0 # Warning: This may fry old Monitors
        VertRefresh  60.0 # Very conservative. May flicker.
#       VertRefresh  50.0 - 62.0 # Extreme conservative. Will flicker. TFT default.
        #  Default modes distilled from
        #      "VESA and Industry Standards and Guide for Computer Display Monitor
        #       Timing", version 1.0, revision 0.8, adopted September 17, 1998.
        #  $XFree86: xc/programs/Xserver/hw/xfree86/etc/vesamodes,v 1.4 1999/11/18 16:52:17 tsi Exp $
        # 640x350 @ 85Hz (VESA) hsync: 37.9kHz
        ModeLine "640x350"    31.5  640  672  736  832    350  382  385  445 +hsync -vsync
        # 640x400 @ 85Hz (VESA) hsync: 37.9kHz
        ModeLine "640x400"    31.5  640  672  736  832    400  401  404  445 -hsync +vsync
        # 720x400 @ 85Hz (VESA) hsync: 37.9kHz
        ModeLine "720x400"    35.5  720  756  828  936    400  401  404  446 -hsync +vsync
        # 640x480 @ 60Hz (Industry standard) hsync: 31.5kHz
        ModeLine "640x480"    25.2  640  656  752  800    480  490  492  525 -hsync -vsync
        # 640x480 @ 72Hz (VESA) hsync: 37.9kHz
        ModeLine "640x480"    31.5  640  664  704  832    480  489  491  520 -hsync -vsync
        # 640x480 @ 75Hz (VESA) hsync: 37.5kHz
        ModeLine "640x480"    31.5  640  656  720  840    480  481  484  500 -hsync -vsync
        # 640x480 @ 85Hz (VESA) hsync: 43.3kHz
        ModeLine "640x480"    36.0  640  696  752  832    480  481  484  509 -hsync -vsync
        # 800x600 @ 56Hz (VESA) hsync: 35.2kHz
        ModeLine "800x600"    36.0  800  824  896 1024    600  601  603  625 +hsync +vsync
        # 800x600 @ 60Hz (VESA) hsync: 37.9kHz
        ModeLine "800x600"    40.0  800  840  968 1056    600  601  605  628 +hsync +vsync
        # 800x600 @ 72Hz (VESA) hsync: 48.1kHz
        ModeLine "800x600"    50.0  800  856  976 1040    600  637  643  666 +hsync +vsync
        # 800x600 @ 75Hz (VESA) hsync: 46.9kHz
        ModeLine "800x600"    49.5  800  816  896 1056    600  601  604  625 +hsync +vsync
        # 800x600 @ 85Hz (VESA) hsync: 53.7kHz
        ModeLine "800x600"    56.3  800  832  896 1048    600  601  604  631 +hsync +vsync
        # 1024x768i @ 43Hz (industry standard) hsync: 35.5kHz
        ModeLine "1024x768"   44.9 1024 1032 1208 1264    768  768  776  817 +hsync +vsync Interlace
        # 1024x768 @ 60Hz (VESA) hsync: 48.4kHz
        ModeLine "1024x768"   65.0 1024 1048 1184 1344    768  771  777  806 -hsync -vsync
        # 1024x768 @ 70Hz (VESA) hsync: 56.5kHz
        ModeLine "1024x768"   75.0 1024 1048 1184 1328    768  771  777  806 -hsync -vsync
        # 1024x768 @ 75Hz (VESA) hsync: 60.0kHz
        ModeLine "1024x768"   78.8 1024 1040 1136 1312    768  769  772  800 +hsync +vsync
        # 1024x768 @ 85Hz (VESA) hsync: 68.7kHz
        ModeLine "1024x768"   94.5 1024 1072 1168 1376    768  769  772  808 +hsync +vsync
        # 1152x864 @ 75Hz (VESA) hsync: 67.5kHz
        ModeLine "1152x864"  108.0 1152 1216 1344 1600    864  865  868  900 +hsync +vsync
        # 1280x960 @ 60Hz (VESA) hsync: 60.0kHz
        ModeLine "1280x960"  108.0 1280 1376 1488 1800    960  961  964 1000 +hsync +vsync
        # 1280x960 @ 85Hz (VESA) hsync: 85.9kHz
        ModeLine "1280x960"  148.5 1280 1344 1504 1728    960  961  964 1011 +hsync +vsync
        # 1280x1024 @ 60Hz (VESA) hsync: 64.0kHz
        ModeLine "1280x1024" 108.0 1280 1328 1440 1688   1024 1025 1028 1066 +hsync +vsync
        # 1280x1024 @ 75Hz (VESA) hsync: 80.0kHz
        ModeLine "1280x1024" 135.0 1280 1296 1440 1688   1024 1025 1028 1066 +hsync +vsync
        # 1280x1024 @ 85Hz (VESA) hsync: 91.1kHz
        # ModeLine "1280x1024" 157.5 1280 1344 1504 1728   1024 1025 1028 1072 +hsync +vsync
        Modeline "1280x1024" 157.50 1280 1328 1488 1728  1024 1025 1028 1072 +hsync +vsync
        # 1600x1200 @ 60Hz (VESA) hsync: 75.0kHz
        ModeLine "1600x1200" 162.0 1600 1664 1856 2160   1200 1201 1204 1250 +hsync +vsync
        # 1600x1200 @ 65Hz (VESA) hsync: 81.3kHz
        ModeLine "1600x1200" 175.5 1600 1664 1856 2160   1200 1201 1204 1250 +hsync +vsync
        # 1600x1200 @ 70Hz (VESA) hsync: 87.5kHz
        ModeLine "1600x1200" 189.0 1600 1664 1856 2160   1200 1201 1204 1250 +hsync +vsync
        # 1600x1200 @ 75Hz (VESA) hsync: 93.8kHz
        ModeLine "1600x1200" 202.5 1600 1664 1856 2160   1200 1201 1204 1250 +hsync +vsync
        # 1600x1200 @ 85Hz (VESA) hsync: 106.3kHz
        ModeLine "1600x1200" 229.5 1600 1664 1856 2160   1200 1201 1204 1250 +hsync +vsync
        # 1792x1344 @ 60Hz (VESA) hsync: 83.6kHz
        ModeLine "1792x1344" 204.8 1792 1920 2120 2448   1344 1345 1348 1394 -hsync +vsync
        # 1792x1344 @ 75Hz (VESA) hsync: 106.3kHz
        ModeLine "1792x1344" 261.0 1792 1888 2104 2456   1344 1345 1348 1417 -hsync +vsync
        # 1856x1392 @ 60Hz (VESA) hsync: 86.3kHz
        ModeLine "1856x1392" 218.3 1856 1952 2176 2528   1392 1393 1396 1439 -hsync +vsync
        # 1856x1392 @ 75Hz (VESA) hsync: 112.5kHz
        ModeLine "1856x1392" 288.0 1856 1984 2208 2560   1392 1393 1396 1500 -hsync +vsync
        # 1920x1440 @ 60Hz (VESA) hsync: 90.0kHz
        ModeLine "1920x1440" 234.0 1920 2048 2256 2600   1440 1441 1444 1500 -hsync +vsync
        # 1920x1440 @ 75Hz (VESA) hsync: 112.5kHz
        ModeLine "1920x1440" 297.0 1920 2064 2288 2640   1440 1441 1444 1500 -hsync +vsync
        # Additional modelines
        ModeLine "1800x1440"  230    1800 1896 2088 2392  1440 1441 1444 1490 +HSync +VSync
        ModeLine "1800x1440"  250    1800 1896 2088 2392  1440 1441 1444 1490 +HSync +VSync
        # Extended modelines with GTF timings
        # 640x480 @ 100.00 Hz (GTF) hsync: 50.90 kHz; pclk: 43.16 MHz
        ModeLine "640x480"  43.16  640 680 744 848  480 481 484 509  -HSync +Vsync
        # 768x576 @ 60.00 Hz (GTF) hsync: 35.82 kHz; pclk: 34.96 MHz
        ModeLine "768x576"  34.96  768 792 872 976  576 577 580 597  -HSync +Vsync
        # 768x576 @ 72.00 Hz (GTF) hsync: 43.27 kHz; pclk: 42.93 MHz
        ModeLine "768x576"  42.93  768 800 880 992  576 577 580 601  -HSync +Vsync
        # 768x576 @ 75.00 Hz (GTF) hsync: 45.15 kHz; pclk: 45.51 MHz
        ModeLine "768x576"  45.51  768 808 888 1008  576 577 580 602  -HSync +Vsync
        # 768x576 @ 85.00 Hz (GTF) hsync: 51.42 kHz; pclk: 51.84 MHz
        ModeLine "768x576"  51.84  768 808 888 1008  576 577 580 605  -HSync +Vsync
        # 768x576 @ 100.00 Hz (GTF) hsync: 61.10 kHz; pclk: 62.57 MHz
        ModeLine "768x576"  62.57  768 816 896 1024  576 577 580 611  -HSync +Vsync
        # 800x600 @ 100.00 Hz (GTF) hsync: 63.60 kHz; pclk: 68.18 MHz
        ModeLine "800x600"  68.18  800 848 936 1072  600 601 604 636  -HSync +Vsync
        # 1024x768 @ 100.00 Hz (GTF) hsync: 81.40 kHz; pclk: 113.31 MHz
        ModeLine "1024x768"  113.31  1024 1096 1208 1392  768 769 772 814  -HSync +Vsync
        # 1152x864 @ 60.00 Hz (GTF) hsync: 53.70 kHz; pclk: 81.62 MHz
        ModeLine "1152x864"  81.62  1152 1216 1336 1520  864 865 868 895  -HSync +Vsync
        # 1152x864 @ 85.00 Hz (GTF) hsync: 77.10 kHz; pclk: 119.65 MHz
        ModeLine "1152x864"  119.65  1152 1224 1352 1552  864 865 868 907  -HSync +Vsync
        # 1152x864 @ 100.00 Hz (GTF) hsync: 91.50 kHz; pclk: 143.47 MHz
        ModeLine "1152x864"  143.47  1152 1232 1360 1568  864 865 868 915  -HSync +Vsync
EndSection

Section "Device"
        ### Available Driver options are:-
# sw_cursor is needed for some ati and radeon cards
        Option     "sw_cursor"
        #Option     "hw_cursor"
        #Option     "NoAccel"
        #Option     "ShowCache"
        #Option     "ShadowFB"
        #Option     "UseFBDev"
        #Option     "Rotate"
        Identifier  "Card0"
# The following line is auto-generated by KNOPPIX mkxf86config
        Driver      "fglrx"
        VendorName  "All"
        BoardName   "All"
#       BusID       "PCI:1:0:0"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Card0"
        Monitor    "Monitor0"
        DefaultColorDepth 24
        SubSection "Display"
                Depth     1
                Modes "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth     4
                Modes "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth     8
                Modes "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth     15
                Modes "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth     16
                Modes "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth     24
                Modes "720x576"
        EndSubSection
        SubSection "Display"
                Depth     32
                Modes "800x600" "640x480"
        EndSubSection
EndSection

Section "DRI"
        Mode 0666
EndSection


Played a bit with the modelines and mythtv settings. I can't get it less then 80% cpu. So if I record 5 recordings at the time, I can't playback a recording at the same time. Didn't had that problem in R5C7
Author:  srahrens [ Sun Aug 05, 2007 11:34 am ]
Post subject: 
Did you ever resolve this? I am experiencing something similar.

After upgrading from R5B7 to R5F1 I see mythfrontend usage of 55% while watching tv... FYI this is SDTV using a pvr-350 on an Athlon64, so it's not exactly as though I have an underpowered system...

xorg also seems to spike pretty good whenever a UI update occurs (up to 95%).

Any thoughts?

Things I have tried:
- Default VBI -> None (did helped tv to be less choppy)
- Upgrade to ivtv 0.10.5
- Upgrade kernel to 2.6.21.6 (for other reasons)
- Ensured DMA usage of HD
- Ensured usage of PVR-350 Decoder chip

System Details:
Athlon64 3800+
NVidia GeForce 6100 chipset
512 MB RAM
200 Gb Seagate PATA drive
PVR-350 using TV-OUT
PVR-250
Author:  srahrens [ Sun Aug 05, 2007 2:04 pm ]
Post subject: 
Well I resolved this issue for my situation. It turns out the setup_350.sh script was making an incomplete xorg.conf file. Specifically the xorg.conf file had no "ServerLayout" section or anything, only the portion of the xorg.conf file that should have been appended to a complete xorg.conf.

In other words, the xorg.conf file didn't actually specify which screen to use, so X defaulted to using both, sending video to the video adapter as well as the pvr-350 (hence the high CPU usage to decode mpeg-2 on the fly.

Hopefully that will help someone at some point. --sa
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