@Josu:<div>I was finally able to work on, and fix the pausing problem. Modifying the following mysql variables fixed the pausing problem:</div><div><br></div><div><div>[mysqld]</div><div>tmp_table_size = 67108864</div><div>
max_heap_table_size = 67108864</div><div>query_cache_limit = 8388608</div><div>query_cache_size = 33554432</div></div><div><br></div><div>In addition, I also setup /tmp as tmpfs, whereas it was originally part of the / partition. This did not contribute as part of the solution, but seemed more like a mysql performance tweak</div>
<div><br></div><div><br></div><div>@Curtis:</div><div>I ran into severe lag issues with mysql and ext4, so I downgraded the file system on /var to ext3 with noatime. However, despite that setup, I was still experiencing the pausing issues.</div>
<div><br></div><div><br></div><div>-Rob</div><div><br><br><div class="gmail_quote">On Sat, Dec 1, 2012 at 10:09 AM, Curtis <span dir="ltr"><<a href="mailto:curtis.porter@gmail.com" target="_blank">curtis.porter@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
2012/11/30 Robert Dege <<a href="mailto:livemotion@gmail.com" target="_blank">livemotion@gmail.com</a>>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Whenever I watch LiveTV, or watch a recording in progress, about 85% of the<br>
time, the playback will pause for about half a sec, and then resume.<br>
There's no notification on the screen, or any picture distortion. This<br>
pause occurs every 5 to 7 seconds. At first, I thought that the mythbox was<br>
being overloaded (I have an HD Prime that can record up to 3 channels at<br>
once onto two physical hard drives). However, I noticed that I can watch an<br>
old show with no interruptions while all 3 tuners are active. I also<br>
discovered that the pausing issue occur even if only one tuner is active,<br>
and I'm watching that recording in progress.<br>
<br>
I'm not exactly sure how I should go about troubleshooting this problem, so<br>
any suggestions are appreciated.<br>
</blockquote></blockquote>
<br></div>
I recently experienced a very similar issue, and running iotop on the backend showed that during the playback pauses was high IO by the process "[jbd2/sdb1-8]". This is the journaling block device for my ext4 root filesystem. Setting the "noatime" mount option on the root filesystem appears to have resolved the problem. Since my recordings are written to a different filesystem, I suspect this was related to mysql activity.<br>
<br>
Good luck,<br>
<br>
Curtis<div class="HOEnZb"><div class="h5"><br>
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