[mythtv] Re:Channel change speed

Boyd II, Willy wboyd at fulbright.com
Fri Sep 12 10:40:52 EDT 2003


Is anyone using XFS?  I've also thought about ReiserFS but first time I used
it was a couple years ago, and it hosed my disk so I've been biased ever
since :-)  But I need to buy a new HD anyway just for recordings, so which
FS to use is one thing I'm trying to decide... maybe I'll go back to
reiserfs afterall..

- Willy

-----Original Message-----
From: Edward Wildgoose [mailto:Edward.Wildgoose at FRMHedge.com]
Sent: Friday, September 12, 2003 9:28 AM
To: Development of mythtv
Subject: RE: [mythtv] Re:Channel change speed


> > Well, it was just a thought.  Since people mentioned that it took a
while
> > to shut down the last session on channel change I wondered if it was
> > something to do with the time needed to remove the buffer file from
disk.
> > Ext3 at least with certain journalling takes a few secs to delete large
> > files (presumbaly updating the bitmap).  I believe that Reiser isn't
great
> > with large files either, but I don't run it so have no experience...
> 
> Reiserfs has extent mapping, and handles large files much faster.

Sounds good.  Perhaps I shouldn't have just formatted my big partition in
ext3....  I do notice that deleting large files, eg 1-2 GB mpg takes a good
few secs under ext3

It's also very slow to handle the gentoo portage database which is pretty
much just 60,000 small files chucked into a hierarchical directory
structure.  Not sure if reiserfs would be faster here since it's basically a
directory enumeration task, however, I plan to try a loop back partition
with reiserfs to see.


Actually, good point, I suppose anyone interested in benchmarking changes to
the ringbuffer could try using a loopback filesystem to see if reiser/ext3
(with options)/or a ram disk makes a difference.  No need to actually blow
away the disk to try this.

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