[mythtv-users] MythTV, seeking ahead / behind, NFS, and bandwidth usage

[MythTV]

I do not see this. My frontend is a (was) a P2 333, 256 megs ram.  All my
recordings are saved ona  PIII 800 with 3ware Raid controller. 600 megs ram,
and 8x120 gig in a raid 5 my recording directory is also using NFS.

As you can see no beefy machines and everytthing runs fine.. I do want a
faster frontend machine for faster menus and such but right now its fine/

What are you using for drives?  7200RPM? slower?  how is your NFS setup?
here is my config on my frontend

fstab entry on my frontend/backend   .254 is only used for storage via NFS
192.168.1.254:/home2/MythTV  /mnt/store  nfs
rsize=8192,wsize=8192,hard,intr,nfsvers=3  0  0

I think if the above is different you could see problems.

I was playing tonight and I hit a key  (number 9) while in a edit mode and I
jumped 9 minutes ahead in no time flat.

Definately sounds like some misconfiguration or IO issues


Jim


----- Original Message ----- 
From: "Blammo[doh]" <blammo at dohboys.com>
To: "Discussion about mythtv" <mythtv-users at mythtv.org>
Sent: Sunday, August 01, 2004 11:25 PM
Subject: Re: [mythtv-users] MythTV, seeking ahead / behind, NFS,and
bandwidth usage


> I think it may be a Disk IO problem, when combined with NFS.
>
> However, On the local Backend itself, off local disk, I don't see the same
> issue, at all, when seeking forward / backward, etc.
>
> digging into it right now, any ideas, appreciated.
>
>
>
> ----- Original Message ----- 
> From: "Blammo[doh]" <blammo at dohboys.com>
> To: "Discussion about mythtv" <mythtv-users at mythtv.org>
> Sent: Sunday, August 01, 2004 7:33 PM
> Subject: Re: [mythtv-users] MythTV, seeking ahead / behind, NFS,and
> bandwidth usage
>
>
> > Great clarification, zero help.
> >
> > >From what I can tell, seeking is the "normal" and preferred behavior,
and
> > assumes it's running from the local HD.
> >
> > FWIW, "jumping" is no faster. It hit the "jump" button and it sits for
> 20-30
> > seconds maybe longer before coming back 10 minutes ahead of where it was

> > before. Something is still IO or configuration  bound.
> >
> > Thoughts?
> >
> >
> >
> > ----- Original Message ----- 
> > From: "Isaac Richards" <ijr at po.cwru.edu>
> > To: "Discussion about mythtv" <mythtv-users at mythtv.org>
> > Sent: Sunday, August 01, 2004 2:16 PM
> > Subject: Re: [mythtv-users] MythTV, seeking ahead / behind, NFS,and
> > bandwidth usage
> >
> >
> > > On Sunday 01 August 2004 04:40 pm, Blammo[doh] wrote:
> > > > Two machines in this cluster, both Athlon XP 2400's, plenty of ram,
> both
> > > > running KnoppMyth R4V4, one backend with two PVR-250's, and a
frontend
> > with
> > > > Nvidia card hooked together on a 100M cisco switch. /myth mounted
over
> > NFS
> > > > from the backend.
> > > >
> > > > Problem:
> > > >
> > > > When seeking forward / backward in MPEG2 streams, from recorded TV,
I
> > seem
> > > > to be running out of ethernet bandwidth. I don't notice this AT ALL
in
> > the
> > > > "Video" section with mplayer, just in the TV section. Anything over
> say
> > 3X
> > > > seems to have diminishing returns. All the way up at 8x or 16x,
> checking
> > > > the switchports shows about 50 - 60meg of traffic running. The load
on
> > the
> > > > backend seems to be pretty low, as does the load on the front end.
It
> > just
> > > > seems like the frontend isn't getting data fast enough.
> > > >
> > > > It appears to me, that the frontend has to read the whole file, to
> seek
> > > > ahead / behind in the file, at 1x, 1.5x 2x etc faster. It doesn't
> appear
> > to
> > > > "seek" or "jump" at all ahead, rather reading the whole thing.
> > > >
> > > > I'm just wondering if anyone else has run into this, and what they
did
> > to
> > > > fix it. Obviously transcoding to a low bit-rate MPEG4 would help. It
> > makes
> > > > me wonder whether the front end couldn't be a little smarter about
the
> > file
> > > > reading, take less NFS bandwidth in the process. After all, mplayer
> has
> > no
> > > > trouble skipping ahead, etc.
> > > >
> > > > Thoughts?
> > >
> > > You're confusing fast-forwarding (what you are doing) with seeking
(what
> > you
> > > want to be doing).
> > >
> > > Isaac
> > > _______________________________________________
> > > mythtv-users mailing list
> > > mythtv-users at mythtv.org
> > > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> > >
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