Christoph Rohland wrote:
>
> Hi Alan,
>
> On Fri, 17 Nov 2000, Alan Cox wrote:
> > Even checking the cpuinfo for the TSC should be done with care, and
> > its far far better to use gettimeofday unless doing very tiny
> > timings (eg for optimising code paths)
>
> gettimeofday is _way_ to slow for a lot of every day uses. So
> applications will use rdtsc until we have some really fast
> (non-syscall) way to have high resolution time diffs.
IIRC, this came up a long time ago WRT Apache, which made a lot of
gettimeofday() calls. Someone (Linus?) proposed the solution of a
'magic page' which holds information like gettimeofday() stuff, but
could be handled much more rapidly than a standard syscall.
-- Jeff Garzik | Building 1024 | The chief enemy of creativity is "good" sense MandrakeSoft | -- Picasso - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Thu Nov 23 2000 - 21:00:13 EST