Messages in this thread |  | | Date | Mon, 26 May 2003 18:17:34 -0700 (PDT) | Subject | Re: userspace irq balancer | From | "David S. Miller" <> |
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From: Dave Jones <davej@codemonkey.org.uk> Date: Tue, 27 May 2003 02:16:20 +0100
On Tue, May 27, 2003 at 03:09:03AM +0200, Andrea Arcangeli wrote:
> rdtsc could do it very well, irqs and softirqs can't be rescheduled so > you can tick measure how long you take in each cpu On CPUs that vary frequency, this will break, unless TSC scales with frequency. You cannot assume that this will be the case.
This is an important issue, for another reason.
The networking packet scheduler layer wants an accurate (but cheap) high frequency time source too.
I keep forgetting to go back and deal with fixing up all of those hairy macros in pkt_sched.h, I've added this to my TODO list. - 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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