[mythtv-users] ATSC content heavy pixel-ating every 15 sec's

Robin Smith 1canuck2 at gmail.com
Tue Jan 11 08:36:52 EST 2005


Quick question...

I changed the IO_support setting for both of my disks but to get the
setting to remain after a reboot you also need to run:

hdparm -k /dev/hdb (or whichever disk it is)

As it won;t stay set by default
Robin


On Fri, 31 Dec 2004 23:12:14 -0700, John Patrick Poet
<john at blueskytours.com> wrote:
> 
> You also might try applying this DTV-ringbuffer patch:
> 
> http://www.gossamer-threads.com/lists/mythtv/dev/101580
> 
> to the latest CVS.
> 
> John
> 
> 
> Yan-Fa Li wrote:
> 
> > Two problems appear obvious:
> >
> > 1. Your drive isn't quite set correctly, just mostly.
> >
> > Try adding:
> >
> >     hdparm -c3 /dev/hdb
> >
> > You can also see if your chipset will tolerate
> >
> >     hdparm -u1 /dev/hdb
> >
> > Not all of them will so you'll have to experiment to see if it causes
> > problems.
> >
> > 2. move drive to master on /dev/hdc
> >
> > You want to move the drive off the same controller as /dev/hda.  Slave
> > drives have very poor performance on IDE.  You want it to be either
> > master on /dev/hdc or on a different PCI IDE card away from your
> > DVD-ROM.  I tend to share the DVD-ROM with the second drive because
> > they are rarely active at the same time.
> >
> > john roberts wrote:
> >
> >> I'm running a CVS build from mid-Dec and I've noticed that every 15
> >> sec's on recorded content I get heavy pixel-ation (if that's a word).
> >>
> >> For a while I thought it was due to a weak station - but it does this
> >> for all recordings.  And the fact it does this EVERY 15 sec's makes
> >> me think there is something odd going on.
> >>
> >> I was thinking it might be a DMA issue - but the drive seems to be
> >> set correctly:
> >>
> >> htpc / # /sbin/hdparm -v /dev/hdb
> >>
> >> /dev/hdb:
> >>  multcount    = 16 (on)
> >>  IO_support   =  0 (default 16-bit)
> >>  unmaskirq    =  0 (off)
> >>  using_dma    =  1 (on)
> >>  keepsettings =  0 (off)
> >>  readonly     =  0 (off)
> >>  readahead    = 256 (on)
> >>  geometry     = 19929/255/63, sectors = 163928604672, start = 0
> >>
> >> My setup:
> >>
> >> - P4 3.2G
> >> - Dec CVS build
> >> - Gentoo
> >> - HD2000
> >> - HD3000
> >>
> >> Thanks!  Could this be a Myth issue?
> >>
> >> -John
> >
> >
> > _______________________________________________
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> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >
> >
> 
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