Subject: Re: [linux-audio-dev] Re: [announce] [patch] Voluntary Kernel Preemption Patch
From: Ralf Beck (musical_snake_AT_gmx.de)
Date: Tue Jul 20 2004 - 21:11:20 EEST
> it's an issue for all block IO drivers that do IO completions from IRQ
> context and that can do DMA - i.e. every block IO hardware that uses
> interrupts. This includes SCSI too. In fact for SCSI it's a norm to have
I renew a question i asked earlier.
To my understanding, on a SMP or hyperthreading system, disabling of
IRQs is always local to one (virtual on HT) cpu.
So would it be possible to get ultralow latency by simply hardlock all irqs
and processes to cpu1 and the irq triggering the audiothread (together with
the audiothread) to cpu 2 using the sched_affinity and irq-affinity
capabilites of the kernel?
This would be an easy to use lowlatency hardware patch for linux audio users
with SMP/HT systems. Anybody knows?
I'm currently thinking about getting a new system and consider a dualsystem if
this worked.
Ralf
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