On Wednesday 21 December 2005 23:24, Florian Schmidt wrote: > (X) Complete Preemption (Real-Time) > > This also introduces the prioritization of irq handler threads i talked > about. Florian, Is that to say that (cf. your tutorial, http://tapas.affenbande.org/?page_id=6) reprioritizing IRQ handlers with things like chrt -f -p 97 `pidof "IRQ sound_car_irq"` which prove so simple and efficient with an -rt kernel, are just pointless with a preemptible kernel (assuming it was compiled with threaded IRQ handlers)? That'd confirm my recent measurements, but still i can scarcely make out why this is so. And while we're at it, i get --amazingly enough-- far more xruns when un-threading my PCI sound card IRQ handler (doing echo 0 > /proc/irq/...) than when leaving it threaded... In any case, thank you for having written this tutorial. Laid out in a perfectly clear way (from my point of view), and a really useful counterpart to a kernel building tutorial. Regards, Syd
