On Sat, 2005-03-26 at 13:32 +0000, Steve Fosdick wrote: > On 24/03/05 19:03:50, Lee Revell wrote: > > On Thu, 2005-03-24 at 13:49 -0500, Lee Revell wrote: > > > Is the USB irq shared with anything? > > > > Never mind, I see that it is shared, and with a pretty "heavy" device > > (the network card). > > > > Is this the case for everyone who is having the problem? > > > > Does disconnecting the network cable help? > > I had previously tried disconnecting the network cable but this didn't > seem to make any difference. I also tried the apci_irq_balance option > but that didn't solve it either. > > I have finally got jackd to run without complain by disabling CPU > frequency scaling, i.e. having the CPU run at 1.2Ghz all the time rather > than switch to 600Mhz when it doesn't appear that there is anything > going on. > > I wonder if this means the code path between the USB interrupt and jackd > being woken up is very long so as to require the full 1.2Ghz or whether > it is just a case of the frequency switching upsetting some time > calculations. Oh, well, of course. JACK does not work with CPU frequency scaling. You need to run it at full speed. This is something of a FAQ. Lee
