Wow - great info on the hdparm -c3 tuning. I've made that change.
The -u (Get/set interrupt-unmask flag for the drive) is a bit scary:
"Use this feature with caution: some drive/controller combinations
do not tolerate the increased I/O latencies possible when this
feature is enabled, resulting in massive
filesystem corruption."
I think I'll pass on that one. ;)
Thanks again,
-John
----- Original Message -----
From: "Yan-Fa Li" <[EMAIL PROTECTED]>
To: "Discussion about mythtv" <[email protected]>
Subject: Re: [mythtv-users] ATSC content heavy pixel-ating every 15 sec's
Date: Fri, 31 Dec 2004 17:33:14 -0800
>
> 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
>
> _______________________________________________
> mythtv-users mailing list
> [email protected]
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
--
_______________________________________________
Find what you are looking for with the Lycos Yellow Pages
http://r.lycos.com/r/yp_emailfooter/http://yellowpages.lycos.com/default.asp?SRC=lycos10
_______________________________________________
mythtv-users mailing list
[email protected]
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
