Messages in this thread | | | Date | Wed, 6 Oct 2004 06:03:23 +0200 | From | Andrea Arcangeli <> | Subject | Re: Preempt? (was Re: Cannot enable DMA on SATA drive (SCSI-libsata, VIA SATA)) |
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On Tue, Oct 05, 2004 at 11:27:06PM -0400, Jeff Garzik wrote: > You're ignoring the argument :) > > If users and developers are presented with the _impression_ that long > latency code paths don't exist, then nobody is motivated to profile them > (with any tool), much less fix them.
well, you are assuming those latencies are visible with eyes. they might be in extreme cases, but normally they're not (what people notices normally are disk latencies, and few people uses an RT userspace anyways which means they cannot claim the problem to be a lack of cond_resched, but more likely they want shorter timeslices in the scheduler etc..). So my point is that you need a measurement tool anyways... - 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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