[mythtv-users] VDPAU playback stuttering when XvMC playback is just fine?

[Keith Richie]

On Fri, May 1, 2009 at 12:53 AM, Dave Johansen <davejohansen at gmail.com> wrote:
> On Thu, Apr 30, 2009 at 5:35 AM, Keith Richie <disturbed1976 at gmail.com> wrote:
>> On Thu, Apr 30, 2009 at 1:38 AM, Jean-Yves Avenard <jyavenard at gmail.com> wrote:
>>> Hi
>>>
>>>
>>> On 30/04/2009, at 3:13 PM, Dave Johansen <davejohansen at gmail.com> wrote:
>>>
>>>> On Wed, Apr 29, 2009 at 10:09 PM, Jean-Yves Avenard <jyavenard at gmail.com>
>>>> wrote:
>>>>>
>>>>> Hi
>>>>>
>>>>> On 30/04/2009, at 2:42 PM, Dave Johansen <davejohansen at gmail.com> wrote:
>>>>>
>>>>>>>
>>>>>>
>>>>>> I will give this a try and see if it helps with the stuttering.
>>>>>>
>>>>>>
>>>>>
>>>>> From your logs it's obvious you have issues with your machine not related
>>>>> to
>>>>> vdpau.
>>>>>
>>>>> Your PC seems to be IO bound for some reasons. Fix that first.
>>>>>
>>>>> I'm guessing the stream is corruted or interrupted
>>>>
>>>> How can I tell if my machine is IO bound?
>>>> And if so how do I tell what the bottleneck is?
>>>>
>>>>
>>>
>>> Look at the log you posted earlier. There are tons of messages regarding  IO
>>> bound issues, just google those
>>>
>>> There's not one single reason for those. Could be a kernel issue, could be
>>> your hard drive (on the backend) is dodgy.
>>>
>>> Just google for those error
>>> messages._______________________________________________
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>>
>> IOBOUND errors are usually one of 2 things. Non optimal kernel
>> configuration, or you've reached the limit of your system.
>>
>> Check to make sure you don't have any non essential services running
>> in the background. Some distro's have those darned indexing utilities
>> ;)
>>
>> Try changing the kernel scheduler, analyze your slab/slub performance
>> (slabtop), and take a look at iostat.
>>
>> Running iostat -x will give you an output showing the utilization of
>> your drives (last column). If it is at or near 100%, you've reached
>> your limit.
>
> iostat -x shows >85% idle, and iotop showed ~2.3 M/s read, but I still
> see the stuttering.
>
> I'm still waiting to see the results of the long S.M.A.R.T. test, but
> does anyone have any ideas on what the issue might be?
>
> Dave
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>

iostat -x shows >85% idle doesn't mean much here ;)

Look at the %uti - the last column for your storage drive (md0/1/2 or
sda/b/c ----)