[mythtv] CC benchmarks and procedure list ? Was: how would one speed up the channel changing in mythtv ?

Bert Haverkamp bert at bertenselena.net
Mon Nov 3 19:24:30 UTC 2008

> I agree - I think that most of this delay is fixable just by tuning the
> current myth buffers, but they are largely currently optimised to work on
> maximum hardware rather than optimised for speed.  I also managed to get my
> channel change speeds down to about 50% of normal with some mild tweaks, but
> I have let the patches rot now.
> One of the things that I spotted last time I worked on this is that the
> various semaphores slow things down needlessly.  This might be changed now,
> but for example my system was waiting 1/4 second for the audio to pause
> before moving on with the next step of the channel change... Pointless wait
> state and so you can likely drop out a fair bit of time by fixing that kind
> of thing also.
> I think that this is a GOOD question, but it needs to be done objectively
> and without these 500 messages which don't have any code or objective
> questions about how/where to profile.
> Do you still have these patches lying around? Could you share those, even
if they don't apply cleanly, I'd like to take a look to see where I can


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