[PlanetCCRMA] emi 2|6 usb performance

[Mark Knecht]

Ryan,
   I wrote some of this up and then Patrick improved it an put it online
at his site. The short answer is the IRQ order, from best to worst, goes
like:

0,1,8,9,10,11,12,13,14,15,3,4,5,6,7

So having these on 5 puts them behind the disks at 14 and 15 and behind
your mouse at 12. Do you get more problems when you move your mouse
around a lot? That would be a clue.

Try moving the pair of devices to 9, 10 or 11 and see if you get better
results.

Try not to share them with anything else. Sharing is never good, it is
only sometimes not bad.

Mark

On Sat, 2002-12-28 at 14:23, Ryan Gallagher wrote:
> Hey mark,
> 
> here's the rest... I can configure the irq's somewhat,
> would a higher/lower irq be better?  I just can't make
> eth0 and usb stop sharing...
> 
> -ryan
> 
>            CPU0
>   0:     398894          XT-PIC  timer
>   1:       9829          XT-PIC  keyboard
>   2:          0          XT-PIC  cascade
>   5:     877651          XT-PIC  usb-uhci, eth0
>   8:          1          XT-PIC  rtc
>  12:     334067          XT-PIC  PS/2 Mouse
>  14:      18218          XT-PIC  ide0
>  15:       3282          XT-PIC  ide1
> NMI:          0
> ERR:          0
> 
> --- Mark Knecht <markknecht at attbi.com> wrote:
> > Ryan,
> >    It could contribute, but probably not. Try simply
> > unplugging your
> > Ethernet cable (as an experiment) and doing some
> > audio work. If the
> > problems go away, or are reduced, then you'r eon to
> > it. I would guess
> > that they will not go away though.
> > 
> >    Do you always get xruns, or only when recording
> > or playing back? If
> > so, the problem could really be your disk subsystem.
> > 
> >    You snipped out the other interrupts. Possibly
> > you can post the whole
> > list. IRQ5 is not a very good interrupt for anything
> > that needs real
> > time support.
> > 
> > Mark
> > 
> > 
> > On Sat, 2002-12-28 at 13:22, Ryan Gallagher wrote:
> > > Hi all,
> > > 
> > > I've been searching for optimal settings that will
> > rid
> > > my life of xruns and latency on my emagic emi 2|6
> > > equipped system.  I've had some success and some
> > > failures.  I still get xruns out the wazoo however
> > > which ain't good obviously.  Here's my
> > > question/hypothesis;
> > > 
> > > cat /proc/interrupts reveals that the usb hub and
> > my
> > > ethernet card are sharing irq 5 (this is a
> > mainboard
> > > issue that I have found no solution to).
> > > 
> > >            CPU0
> > >   0:      10177          XT-PIC  timer
> > >   1:         47          XT-PIC  keyboard
> > >   2:          0          XT-PIC  cascade
> > >   5:        369          XT-PIC  usb-uhci, eth0
> > >   8:          1          XT-PIC  rtc
> > > 
> > > Could this little resource sharing arrangement
> > > contribute to the above listed issues?  Anyone out
> > > there use snd-usb-audio alsa drivers?  Share your
> > > thoughts.
> > > 
> > > later-
> > > -ryan
> > > 
> > > =====
> > > --r--
> > > 
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> 
> 
> =====
> --r--
> 
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