[linux-audio-user] Ardour - xrun in Atlhon 2.8 !?

[Eric Dantan Rzewnicki]

On Fri, Sep 10, 2004 at 12:53:30PM -0300, Alexander Franca wrote:
> Recording:
> ---------------------------------------------------------------------
> /dev/hda:
>  Timing buffer-cache reads:   820 MB in  2.01 seconds = 408.43 MB/sec
>  Timing buffered disk reads:   10 MB in  3.38 seconds =   2.96 MB/sec
> 
> Without Record:
> ---------------------------------------------------------------------
> /dev/hda:
>  Timing buffer-cache reads:   852 MB in  2.01 seconds = 423.94 MB/sec
>  Timing buffered disk reads:    8 MB in  3.00 seconds =   2.66 MB/sec
> 
> Recording again:
> ---------------------------------------------------------------------
> /dev/hda:
>  Timing buffer-cache reads:   812 MB in  2.00 seconds = 405.25 MB/sec
>  Timing buffered disk reads:   10 MB in  3.66 seconds =   2.74 MB/sec
> 
> Runing Jack
> ---------------------------------------------------------------------
> /dev/hda:
>  Timing buffer-cache reads:   1028 MB in  2.00 seconds = 512.80 MB/sec
>  Timing buffered disk reads:   10 MB in  3.26 seconds =   3.07 MB/sec

ooOOoo. those are really low. You should expect to be getting more on
the order of 20-30 MB/sec for buffered disk reads. I've never worried
about buffer-cache reads, doesn't really mean a whole lot for sustained
i/o in my experience.

I get upwards of 40MB/s at home on ATA133 drives. You need to tweak your
kernel config and/or set some dma and other options with hdparm.

-Eric Rz.