[mythtv-users] Dual-FireWire troubles in 0.20 solution found

Michael T. Dean mtdean at thirdcontact.com
Fri Sep 15 18:20:35 UTC 2006

On 09/15/06 00:59, Yeechang Lee wrote:

>Thanks to a lot of back-and-forth debugging with the extremely-helpful
>Jim Westfall, the author of MythTV's FireWire code, we determined that
>reducing the HD Ringbuffer to 23500 (I'd had it set to the 96000
>maximum since first setting the system up in December) permits two
>FireWire streams to record simultaneously record. Since having this
>number set high is good for ATSC recording, I trust that Jim will work
>up a longer-term solution to the issue shortly.

Or, so you tried to tell Daniel.  He responded back with 
http://www.gossamer-threads.com/lists/mythtv/users/183967#183967 .  
Remember the part about, "(To big a buffer can give you thrashing which 
destroys performance.)"?  (Not to mention the part about, "It is very 
easy to break MythTV playing with the TFW params.")

IMHO, a "longer-term solution" isn't necessary just so you can use your 
overly-large HDRingbufferSize.  If you want to use 96MB, get another 
backend and use 96MB in each or get more RAM or put your MySQL on 
another system or ...


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