[mythtv-users] Lengthy delay watching recordings

[Josu Lazkano]

2012/5/22 Michael T. Dean <mtdean at thirdcontact.com>

> On 05/22/2012 02:19 PM, Rich West wrote:
>
>> I noticed that going to 0.25 about a month back that the delay to start
>> playing an HD video had increased substantially and was curious as to
>> what might be the cause.
>>
>> As I looked further, I realized that it is with all video, but HD
>> content appears to be the most obvious offender.  It can take up to 31
>> seconds from the moment the user selects the video to play before it
>> actually starts playing.
>>
>> My backend system is well used, but from the graphs I have, it's not
>> hurting with CPU or memory.  Network to the frontends are all hardwired
>> (backend is gig, frontends are 100 meg).  From a utilization
>> perspective, the drives on the backend server are always hovering at
>> around 85% utilization, which is good, and the general I/O on the drives
>> is not such that it would cause a negative impact.
>>
>> I am using commercial detection, so I do suspect that there is some form
>> of buffering going on, but for 31 seconds?  No network errors on the
>> switch or the interface for the frontend or the backend.    CPU
>> utilization on the frontend is low.. basically idle.
>>
>> I'm just wondering if there is a particular place within MythTV to look
>> (for example, I recently found that it was recommended that "quick
>> tuning" should be enabled for the hdhomerun)..
>>
>>
> /me guesses you have MySQL data on a file system with barriers enabled.
>
> Mike
>
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Hello, I have same problem on 0.25. My system is a combined frontend
backend.

MySQL data is on the same partition as the system:

/dev/sda1 on / type ext4
(rw,relatime,errors=remount-ro,user_xattr,barrier=1,data=ordered)

How could I change the barrier on my partition?

Kind regards.

-- 
Josu Lazkano
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