[64studio-devel] [64 Studio] #287: Possible kernel regression with high jackd sample rates in 32-bit version

[Free Ekanayaka]

Hi all,

|--==> Daniel James writes:

  DJ> Hi Dick,
  >>I have just run a comparison of loading using Ardour using various 
  >>versions on my hardware. I played back a four-channel recording with 
  >>three effect at 44.1 k and 128 sample buffer, 5.8 milliseconds delay. On 
  >>DeMudi it used 33% processor and on 64Studio 1.4, kernel 2.6.19 it uses 
  >>58% and similar with 2..6.19.

  DJ> Thanks for running these tests! My best guess is that the DeMuDi kernel 
  DJ> had some optimisation for 32-bit CPUs that we aren't using in our 32-bit 
  DJ> build. Either that, or the 2.6 kernel just isn't as efficient as the 2.4 
  DJ> kernel, assuming you are running 2.4 on DeMuDi - this seems much less 
  DJ> likely though.

AFAIR demudi kernels had no particular CPU optimisation enabled.

Ciao!

Free