[mythtv-users] Playback problem -- random short pauses

[Steven Adeff]

On Mon, May 23, 2011 at 9:41 AM, Mark Lord <mythtv at rtr.ca> wrote:
> On 11-05-23 08:08 AM, Steven Adeff wrote:
>> Are any of the more involved Dev's other than JYA paying attention to
>> this? (this is a callout for them to answer).
>>
>> It's looking like this may be a major issue that many users, with
>> varying levels of hardware, are experiencing. I think it may be time
>> to  create a ticket for this issue, but it would be nice to have a dev
>> that can work with us in figuring out what's going on, and how exactly
>> to create a ticket that will lead to some debugging help from the
>> dev's for the users experiencing the problem to use to troubleshoot.
>>
>> the other end of all this is that it may be an issue that some of the
>> further tweaking that's been done for the next release has resolved
>> already. I'm wondering if anyone running off the latest git is
>> experiencing?
>
>
> I take it this is only (or is it primarily?) happening in trunk,
> and not in 0.24-fixes?  I only run the latter here (no pauses).
>
> What I would look for in the code, are sync(), fsync(),
> and fdatasync() calls.  Those generally force writes to happen
> and pause a lot of stuff to wait for them to complete in real-time.
>
> Which can lead to tiny pauses and glitches elsewhere.
>
> So just as a trial, perhaps grep through the code looking for those,
> and temporarily remove them, to see if the problem then goes away.
> That should prove/disprove this theory.

my concern with this is other detrimental effects that just removing
those calls would cause? I just don't know enough about programming to
make this change in a way that would be useful for troubleshooting.


-- 
Steve
http://www.mythtv.org/wiki/User:Steveadeff
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