On 07/24/2014 09:16 PM, Russell Hanaghan wrote: > > >> On Jul 24, 2014, at 12:06 PM, Jeremy Jongepier <jeremy@xxxxxxxxxxxxxx> wrote: >> >>> On 07/24/2014 08:18 PM, Russell Hanaghan wrote: >>> Hey, >>> >>> Is anyone achieving significant audio latency gains or xrun stability using a RT kernel with Kxstudio or similar Ubuntu studio distro's? >>> >>> If so, which kernel / where /do I gotta roll my own? >>> >>> Thanks! >>> >>> ~ Russell >> >> Hi Rusell, >> >> I'm using stripped down Ubuntu installs with 3.2 and 3.8 RT kernels >> which I roll myself. RT kernels allow me to achieve slightly lower >> latencies and a bit more stable systems. But I don't think this is all >> due to the RT kernels, it's also doing the right tweaks with the right >> tools. >> >> Jeremy >> > > Thnks Jeremy, > > Anything specific of notable effect? > No not really. With a lowlatency kernel I can barely run my audio interface at 8 / 3 @ 48kHz which works in a bit more stable way with a RT kernel. I typically run at 64 / 3 and then xruns pop up faster with a lowlatency kernel compared to a RT kernel. You write: "But in testing with Enlightenment, also killing all unnecessary processes, it really appears to make very little difference to how firewire interface performs. Running Mixbus 2.5, 8 mono trx, 5 Harrison plugins (EQ, master EQ, etc). Older laptop... Sony Vaio dual core 1.6ghz, 2g, firewire Maudio solo. Disabled ACPI stuff, wireless and so forth. 256 / 3 is barely stable with plugins not running w/ record." So you're using FireWire, in that case the FireWire host controller chipset is key, maybe you could post the output of ffado-diag. Also getting the IRQ prios right can make a huge difference when using FireWire. Jeremy > I've read up on most of it I think. Top items; > > Shut wireless networking off. > Dedicated irq to audio device. > Kill or disable power saving stuff > Minimize background proc intensive processes. > > Realtimescan app reports all is well bar no RT kernel. Typical recording is at 44.1/16. > > Thnx > R >
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