[mythtv-users] diskless xBox stuttering - was Help Diskless
ben_dash at yahoo.com
Mon Nov 7 09:50:05 EST 2005
--- George Nassas wrote:
> On 5-Nov-05, at 10:20 PM, Ben Dash wrote:
> > since I changed to a 2.6 kernel I get no errors
> I'm running 2.4 because I read the 2.6 fatx driver
> isn't quite ready
> for prime time. Do you do any updating of the xbox's
> filesystem while
> you're in linux?
No. The only thing I'm using the native HDD for is
swap and that seems fine with the fatX drivers for
2.6. I read somewhere that a major problem with FatX
for 2.6 was a lack of long filename support and swap
doesn't need that.
> > I just don't understand why I'm getting stuttering
> > when my CPU utilization is so low, i.e. 50%. I
> had a
> Could it be something to do with syncing updates to
> the vertical
> retrace? I've never had those kinds of issues on any
> of my FEs but I
> think some past threads on this list that mentioned
> that. One of those
> things you skim and file away for future use. Look
> for Use OpenGL VSync
> in the TV Playback menus.
> BTW, does the frontend log say anything?
The frontend log just says "prebuffering pause".
I had an interesting development this weekend, I would
have replied to this thread earlier but my PC was in
pieces for an upgrade. Anyway, my development was
that I found that if I run an xterm in the background
and run top on it, then I get hardly any "prebuffering
The stuttering goes from once every 10 seconds,
without the xterm runing top, to once every 10 minutes
with the xterm running top. Interestingly, when a
stutter occurs the CPU utilization appeared to go down
not up. Clearly the CPU isn't the limiting factor in
I have a gigabit switch so I doubt that I have a
network bandwidth problem. My myth backend server is
a different machine than my NFS root server (note that
the xBox frontend is diskless with an NFS root except
for a local fatX swap).
So, the current status is that I, and more importantly
my wife, can experience stutter free live TV and
recorded shows at 640x480, which is GREAT. All I have
to do is start up an xterm running top in the
This seems more than a little wierd though.
Does anyone have any idea why this solution is able to
mask the problem and, if so, what a real solution
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