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* Nick Piggin <nickpiggin@yahoo.com.au> wrote: > Given that we're looking for something acceptable for 2.6, how about > adding > > if (rt_task(current)) > kick ksoftirqd instead > > Otherwise, what is the performance penalty of doing all softirq > processing from ksoftirqd? this is insufficient too. An RT task might be _waiting to run_ and spending our time in a non-RT context (including the idle task) doing softirq processing might delay it indefinitely. what we could do is to add a rq->nr_running_rt and do the deferred softirq processing unconditionally if (rq->nr_running_rt). I'd still add a sysctl to make it unconditional for user processes too - if someone really cares about latency and doesnt want to make all his tasks RT. I'll code this up for the next version of the patch. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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