[ardour-users] disk throughput problems with beta

[Karl Hammar]

> On Wed, 30 Mar 2005 22:45:49 -0500 (EST), Jesse Chappell <jesse at essej.net>  
> wrote:
> 
> > On Wed, 30 Mar 2005, Peter Lutek wrote:
> >
> >> just looked at some recent session directories and, while a separate  
> >> peak
> >> directory does exist, in fact it is empty, and the peak files are being
> >> written in the same directory as the wave files.
> >
> > This is not good, and almost definitely a bug.  Withhold complete
> > judgement until we fix this, because it definitely helped out
> > with ext3.
> >
> 
> in my most recent tests, peak files ARE where they should be. don't know  
> what was going on before. i'll keep monitoring to make sure.
> 
> sorry to have raised the alarm. however, the problem with recording while  
> recording waveform display is ON still remains. same results for me on  
> both ext3 and xfs.
> 
> -p

It is my understanding that a journalling filesystem is worse
latencyvise compared to a traditional one like ext2.

If you have a latency problem and suspect the filesystem;
take a spare disk, make a few partitions with ext2, ext3, xfs, ...,
stop all daemons (else you might be measuring latency problems in
/var), unmount whatever you can.

Then mount them one at a time, start recording, umoun, take next
filesystem. Btw., there was a bug in ext3 last summer, which caused
a custemer get 2s latency from time to time.

Regards,
/Karl

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