Re: [PATCH 1/6] new timeofday core subsystem for -mm (v.B3)

From: Chris Friesen
Date: Tue Jun 21 2005 - 09:56:52 EST

Lee Revell wrote:

But some user space apps are now *required* to use rdtsc for timing due
to the massive performance difference. If we only took a 5x or 10x
performance hit vs rdtsc, rather than the current 50x, it might be
enough that user space apps won't have to do this.

For my userspace apps I've actually switched to clock_gettime(CLOCK_MONOTONIC, &ts);

This at least guarantees that it will never go backwards.

For the experts: Is there a clock exported to userspace that is both monotonic and uniform? Does CLOCK_MONOTONIC give this on linux?

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