Subject: Re: [linux-audio-user] is ext3 ok for real-time / low-latency?
From: Jan \ (eviltwin69_AT_cableone.net)
Date: Sat Feb 15 2003 - 21:20:36 EET
Converting to reiserfs is a pain but no fsck'ing on boot is worth it.
If you're not going to use that though I would use ext2. Like you, I've
never lost an ext2 disk due to a crash. I have let the smoke out of a
couple of disk drives though :-)
Jan
On Sat, 2003-02-15 at 08:44, Larry Troxler wrote:
> On Saturday 15 February 2003 08:57, Jan \"Evil Twin\" Depner wrote:
> > I have copies of Mark Knecht's benchmarks on my web page :
> >
> > http://myweb.cableone.net/eviltwin69/Arcana.html
>
> That's a good link - thanks.
>
> Man, there's so many factors to think of it. I was especially boggled to hear
> that the disk drive cable I'm using might be a culprit. Arggh! Who can keep
> track of all this?
>
> >
> > as well as a write-up explaining why you shouldn't use ext3. It
> > basically comes down to the fact that ext3 is using a separate file to
> > handle the journal. What this means is that as you write your audio
> > data, every once in a while, the system has to write to a different file
> > in a separate location on the hard drive.
>
> Yeah, that's what I was concerned about.
>
> > It will depend on how close
> > the files are physically to each other, disk latency, and a host of
> > other things but, eventually, you will see problems with ext3. It's not
> > hard to convert to reiserfs (instructions (destructions?) are included
> > on the above page) so why not.
>
> Looks like you can't convert non-destructively though. What a pain.
>
> > Reiser journals are kept with (as part
> > of?) the files - you don't have to run fsck after a crash. A real
> > intersting thing to note is that reiserfs actually seems to be faster
> > than ext2 for what we're doing.
> >
>
> fsck'ing is a pain, yes, but if it needs to be done too often there's other
> problems :-) so for me, ext3 is nice, but not needed I think. I have had bad
> shutdowns over the years quite often on ext2, and although it's not nice to
> wait for it to come back up, I've never had a case where I had to do a manual
> repair.
>
> Larry Troxler
>
>
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