[linux-audio-user] Ardour, Jack, and 2.6 kernels

[mark62756 at comcast.net]

interesting. i bet it is probably a untune IDE driver.  i shall try the data=writeback mode out this weekend if i figure out how.  :)

--
Marko Dimiskovski


> 
> > As an aside, Ardour does have "native raid" which
> > doesn't have the computational overhead of kernel
> > supported raid. 
> 
> I can't imagine that he's suffering from THROUGHPUT issues. RAID doesn't
> improve latency, for this sort of application.  RAID's good for when you
> need higher throughput, and even 8 channels of 16-bit/44.1K audio is very
> low in throughput for modern drives.
> 
> > Perhaps it would be useful for systems
> > that have drive related performance issues. 
> 
> With a 400ms latency, I highly doubt this is his problem especially since
> using the 2.6 kernel makes that alot better.  It's either an untuned IDE
> driver (2.6 may have a better chipset tuning setup automatically), or a
> filesystem-related problem.  (Try data=writeback mode if using ext3).
> 
> A 2.4.2x-preemptible kernel with low-latency engaged and a tuned IDE driver
> with ext3 in writeback mode, or reiserfs should definitely get you JOY with
> audio latency.
> 
> Make sure you compile in support for IDE chipsets (VIA, SiS, Intel, etc), so
> Linux can best tune/adjust transfer modes and DMA timings for optimal
> results.  Many stock distribution kernels just include generic support.
> 
> =MB=
> -- 
> A focus on Quality.
>