On 05/12/2014 10:02 AM, Louigi Verona wrote:
  Harry,
 "And hyperthreading (usually a bios setting)?"
 Will try to turn it off.
  
Hi Louigi,
With the JACK settings you're using this probably won't make a
difference. If you go really low latency-wise you might run into issues.
 "Personal experience with an Acer tm 5720, even setting to powersave
 governed makes xruns / fallouts go away."
 are you suggesting that at powersave mode things are actually better? Why?
 I just tried doing this, xruns continue to be generated.
  
Disabling scaling, so setting a governor that doesn't change the CPU
freq, should yield better results, no matter which governor this is.
 Lorenzo,
 "Did this include turning CPU Scaling off and setting _all cores_ to
 "performance"?"
 Yep.
 "Also switching off (internal) wifi improves the situation here."
 How do you switch it off? 
There should be a radio button on your keyboard linked to a Fn key to
disable WiFi. Otherwise you could try unloading the kernel modules
loaded by the WiFi interface or even unbinding them. But I don't think
this is your issue either. Could you pastebin the output of some commands?
cat /proc/interrupts
sudo lspci -v
sudo lsusb -v
cat /etc/default/rtirq
uname -a
Thanks!
Jeremy