[mythtv-users] IOBOUND - blocking in ThreadedFileWriter::Write() --- WTH?

[Mudit Wahal]

elevator=cfq didnt help in my setup. I never got around to moving my
recordings to jfs file system. So, I'm just using 16MB buffer and
seldom had iobound problem. I added another hard drive and formatted
it as xfs file system. But the recording is still on ext3.

On 1/8/06, Kevin Kuphal <kuphal at dls.net> wrote:
> Blammo wrote:
>
> >This is getting old:
> >
> >2006-01-08 14:53:20.087 IOBOUND - blocking in ThreadedFileWriter::Write()
> >2006-01-08 14:53:21.216 IOBOUND - blocking in ThreadedFileWriter::Write()
> >2006-01-08 14:53:21.586 IOBOUND - blocking in ThreadedFileWriter::Write()
> >2006-01-08 14:53:21.666 IOBOUND - blocking in ThreadedFileWriter::Write()
> >2006-01-08 14:53:29.968 IOBOUND - blocking in ThreadedFileWriter::Write()
> >2006-01-08 14:53:30.194 IOBOUND - blocking in ThreadedFileWriter::Write()
> >2006-01-08 14:54:08.315 IOBOUND - blocking in ThreadedFileWriter::Write()
> >2006-01-08 14:54:49.007 IOBOUND - blocking in ThreadedFileWriter::Write()
> >
> >
> >I've read all the threads I can find on this topic, with no good
> >fixes. The only one that seems applicable is the 2M/8M/32M buffer
> >change for HD content. Before I introduce CVS into my otherwise
> >completely stable env, I'd like to make sure there's nothing else I
> >can do.
> >
> >
> >
> <snip>
>
> >what the hell is going on?
> >
> >
>  From everything I can remember about IOBOUND, it means your hardware
> (probably disk) isn't able to keep up.  What filesystem are you using?
> I'm assuming that CBS is 1080i while the other channels are 720p?   I'm
> guessing also that the commercials are not at 1080i either.  Seems to me
> that indicates strongly that there is something going on in the I/O to
> disk.   Also, are you running real-time commflagging on these
> recordings?  If so, does this behavior change if you do not run that job?
>
> I think this thread is the most relevant to your situation:
> http://www.opensubscriber.com/message/mythtv-dev@mythtv.org/1682169.html
>
> and includes suggestions about increasing the buffer size as well as
> elevator=cfg and the filesystem in question.
>
> Kevin
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