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realtime ( was RE: unexpected high fragmentation, any ideas? )

To: <linux-xfs@xxxxxxxxxxx>
Subject: realtime ( was RE: unexpected high fragmentation, any ideas? )
From: "Scott Fagg" <scott.fagg@xxxxxxxxxxx>
Date: Thu, 7 Apr 2005 11:05:18 +1000
Sender: linux-xfs-bounce@xxxxxxxxxxx
Thread-index: AcU7AS8HkX4YmI2gQ56FU7Dta+G/gwADJS0g
Thread-topic: realtime ( was RE: unexpected high fragmentation, any ideas? )
 
Would realtime have any use outside of video-streaming ? What sort of
benefit might it offer other apps, e.g. db servers ? 

> -----Original Message-----
> From: linux-xfs-bounce@xxxxxxxxxxx 
> [mailto:linux-xfs-bounce@xxxxxxxxxxx] On Behalf Of Eric Sandeen
> Sent: Thursday, 7 April 2005 9:32 AM
> To: Steve Lord
> Cc: Marc Lehmann; linux-xfs@xxxxxxxxxxx
> Subject: Re: unexpected high fragmentation, any ideas?
> 
> Steve Lord wrote:
> >>           This feature is unsupported at this time, is not 
> yet fully
> >>           functional, and may cause serious problems.
> >>
> > It is the same thing, that comment has been there for several years
> > and is not going to go away unless someone tries to use it in
> > earnest. I don't think the actual code is as bad as that comment
> > suggests. Realtime on Irix was used by lots of folks, its the linux
> > specific parts which may be need a little help.
> 
> Hmm I probably wrote that comment ;-)  At one point realtime 
> had a bad 
> habit of clobbering your superblock when IO went to the wrong 
> device... 
> but I fixed that a couple years ago.  At one point realtime -was- 
> working fine.
> 
> If you'd like to try it, and have any concerns, just give it 
> a whirl on 
> a disposable filesystem.  Anything that goes wrong will be 
> contained to 
> that filesystem, so no real worries.
> 
> -Eric
> 


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