Re: [Linux-ia64] ping(8) faster than light (do_get_fast_time) (fwd)

[Martin Wilck <Martin.Wilck@fujitsu-siemens.com>]

On Fri, 10 Aug 2001, David Mosberger wrote:

> >>>>> On Fri, 10 Aug 2001 15:15:56 +0200 (CEST), Martin Wilck <Martin.Wilck@fujitsu-siemens.com> said:
>
>   Martin> The deeper reason is that on IA64, *do_get_fast_time()
>   Martin> equals do_normal_gettime(), which simply returns xtime.
>
> This distinction doesn't make sense on ia64 because there is no
> (slow) gettimeofday() to begin with.

Then, unless I'm completely mistaken, time_init() should change the
pointer do_get_fast_time to use do_gettimeofday() rather than
do_normal gettime(). Unless this is done, get_fast_time()
will simply return xtime. Or am I overlooking something?

>   Martin> 1) Is do_gettimeofday () too slow on IA64 to use it for
>   Martin> do_get_fast_time() ?
>
> I have no idea what you mean here.  On ia64 do_gettimeofday() returns
> xtime plus an itc based time offset.

Yes, but get_fast_time() doesn't (see above), and that's the function
that is called for getting timestamps for socket buffers.

Martin
-- 
Martin Wilck     <Martin.Wilck@fujitsu-siemens.com>
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