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| Upgraded from MX440 to 6600GT gives high CPU usage http://forum.linhes.org/viewtopic.php?f=2&t=9761 |
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| Author: | ik632 [ Sun Apr 23, 2006 6:19 pm ] |
| Post subject: | Upgraded from MX440 to 6600GT gives high CPU usage |
I was running an Nvidia MX440 in my Myth box and I was having problems with picture quality. I was getting lines across the screen so I figured I'd upgrade from the MX440 to the 6600GT and see if the lines went away. Well, I upgraded and the lines went away, the picture quality also improved quite a bit for both SD and HD. The problem that I'm having now is that before the "upgrade" I was seeing pretty good CPU usage when watching HD (about 35% for mythfrontend and about 15% for XFree86). Now when I watch recorded programs I get about 40% for Mythfrontend and 50-60% for XFree86. I can SSH to the box while it's running and switch from watching a recording back to the list of shows and the XFree86 drops to less than 2%. Also, when you fastforward the recording the XFree86 usage also goes from 50-60% to around 15%. It almost seams like it's struggling to deinterlace now. |
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| Author: | ik632 [ Tue Apr 25, 2006 4:48 pm ] |
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I upgraded the nvidia drivers to the latest version and that has not helped. Anyone? |
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| Author: | tjc [ Tue Apr 25, 2006 6:45 pm ] |
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Uhm... Don't know if this is it but there's a known high CPU usage situation with newer versions of the driver and newer cards with certain features. I think sync to v-blank is one and there are 2-3 others. I'd recommend seeing the MythTV release notes for more information. |
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| Author: | ik632 [ Thu Apr 27, 2006 7:10 am ] |
| Post subject: | |
Thanks. I checked the release notes and there are a few mentions of similar problems to what I'm having. I may go and switch back to the MX440 and see what I can do about improving the SVideo out signal quality. The problem I get with the MX440 is that I get interference lines across the TV at about 45 degrees. They almost look like they are at about 60 hertz the way they move across the screen so I think there's some interference somewhere. I'm going to read up on shielding the card or see if there's something I can do. I would almost rather deal with the lower quality picture and have smoother playback. Thanks again, Nick tjc wrote: Uhm... Don't know if this is it but there's a known high CPU usage situation with newer versions of the driver and newer cards with certain features. I think sync to v-blank is one and there are 2-3 others. I'd recommend seeing the MythTV release notes for more information.
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| Author: | Xsecrets [ Thu Apr 27, 2006 8:43 am ] |
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if you didn't already try it make sure opengl sync is turned off or on whichever gives you better performance. Some driver/card combos really don't like the ogl sync |
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| Author: | Liv2Cod [ Thu Apr 27, 2006 11:23 am ] |
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Double-check your AGP settings to make sure you aren't force-loading the nVidia AGP drivers. I've heard of that causing the excessive CPU problem for another MythTv user. |
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