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Date: Wed, 28 Feb 2007 16:07:10 -0600
From: Matt Stegmeir <steg0044@aem.umn.edu>
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Cc: FreeBSD <freebsd-multimedia@freebsd.org>
Subject: Re: Cxm and dma...
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Changing the decoder used by mythTV to ffmpeg instead of whatever the 
default was helped for me.  CPU usage was still higher than expected, 
but at least things worked smoothly.

usleep: what are reasonable values for CXM_SG_BUFFERS?

usleepless@gmail.com wrote:

> Anders,
>
> On 2/28/07, Anders Troback <freebsd@troback.com> wrote:
>
>> Hi,
>>
>> I'm running MythTV with a PVR-350 card (using pvrxxx). In "Live View"
>> the performance is bad. In /var/log/messages I've got lots of:
>> ......
>> Feb 28 22:15:07 tv kernel: cxm0: encoder dma not already in progress
>> Feb 28 22:15:07 tv kernel: cxm0: encoder dma not enough buffer space
>> .....
>>
>> My system is a 2.4 GHz Pentium with 515Mb RAM running on a FreeBSD 6.2.
>>
>> Any ideas out there?
>
>
> you can crank up CXM_SG_BUFFERS in cxm.h. try that.
>
> it is this low ( 16 ) at the moment because i had strange panics on
> 4.11 with 4 cards ( each claiming #CXM_SG_BUFFERs ). settings this to
> 16 solved the issue.
>
> regards,
>
> usleep
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