[mythtv] Hardware configuration

[Johann Klemmack]

I have:
Timing buffer-cache reads: 128 MB in 0.62 seconds = 208.06 MB/sec
Timing buffered disk reads: 64 MB in 1.69 seconds = 37.97 MB/sec

In Capabilities, I'm set to udma5, 16 of 16 r/w multiple sector transfers
used, and look-ahead and write caching are enabled.

I don't know what the north-south chipset capabilites are, but Abit lists
chipset as VIA KT266A / VIA VT8233

http://www.abit.com.tw/abitweb/webjsp/english/mb_spec.jsp?pPRODUCT_TYPE=Moth
erBoard&pMODEL_NAME=KR7A

I know the NVidia Linux driver has MPEG decoding support, so I guess my
hiccup is in harddrive/processor/bus (which is 266MHz).

I have noted, though, that 640x480 MPEG4 compression will jerk a few times
in the first minute, then settle out and only happen about once every 5
minutes.  Not ideal, but it seems to me some buffer is overflowing or
whatnot.  Still annoying.

Any help would be greatly appreciated!

Thanks,
	Johann


> -----Original Message-----
> From: mythtv-dev-admin@snowman.net
> [mailto:mythtv-dev-admin@snowman.net]On Behalf Of Jesse Crews
> Sent: Monday, January 06, 2003 1:33 AM
> To: mythtv-dev@snowman.net
> Subject: Re: [mythtv] Hardware configuration
>
>
> What are your north and south bridges? What is the output of hdparm -tT
> /dev/[your recording medium, i.e.: /dev/hda]?
> Get a printout for hdparm -I /dev/hdx, and look under Capabilities. Make
> sure r/w multiple is maxed out, and dma mode is correct, etc.
> Commands/features should show that look-ahead and write caching
> are enabled.
> The best settings are typically the default.
> ----- Original Message -----
> From: "Johann Klemmack" <klemmack@earthlink.net>
> To: <mythtv-dev@snowman.net>
> Sent: Monday, January 06, 2003 00:20
> Subject: RE: [mythtv] Hardware configuration
>
>
> > Heh - weird.  I have an Athlon 1700+ and I can NOT get jitter-free mpeg4
> at
> > 640x480.  I have a GeForce4 MX420 card, 512 RAM, off a VIA
> chipset with an
> > ATA100 harddrive, and WinTV.  Everything is running off of
> Redhat 8.0 (b/c
> > I'm a slacker).  I have DMA enabled for the harddrive access, but trying
> to
> > run mpeg4 at all pretty much peaks out my processor.  I've thought about
> > just upgrading my proc to an Athlon 2100+ (don't worry, the
> 1700+ will be
> > put to good use ;-) but by the sounds of this, something's wrong in my
> > system.  Any help on getting me jitter-free mpeg4?
> >
> > Johann
> >
> > > -----Original Message-----
> > > From: mythtv-dev-admin@snowman.net
> > > [mailto:mythtv-dev-admin@snowman.net]On Behalf Of Bruce Markey
> > > Sent: Monday, January 06, 2003 12:37 AM
> > > To: mythtv-dev@snowman.net
> > > Subject: Re: [mythtv] Hardware configuration
> > >
> > >
> > > Stephan Wentz wrote:
> > >  > ...celeron 1200, 512 mb ram...
> > >  > ...recording and timeshifting...
> > > > ...will this machine be fast enough to accomplish that?...
> > >
> > > Yes. 640x480 mpeg4 with the default settings should take
> > > about 70 some percent CPU utilization. you'll be able to
> > > timeshift, which is record and playback of a ringbuffer,
> > > and shouldn't see any jitter problems.
> > >
> > > --  bjm
> > >
> > >
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