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SubjectRe: TCP/IP Speed
On Wed, 30 Jan 2002, Zwane Mwaikambo wrote:

> On Wed, 30 Jan 2002, Richard B. Johnson wrote:
>
> > But it's already connected.
> >
> >
> > host:
> > for (;;) {
> > gettimeofday(...);
> > write(s, buf, 64);
> > read(s, buf, sizeof(buffer));
> > gettimeofday(...);
> > /* delay is 1.0 ms */
> > }
> > server is IPPORT_ECHO
>
> You didn't make that explicit in your previous email, and anyway what kind
> of resolution can you expect from gettimeofday...
>

The resolution is in microseconds. That's the specification. Not
all 'codes' are exercised of course, but the resolution is sufficient
to discern a 10 to 30 microsecond difference. I'm trying to measure
milliseconds, well within its capability. FYI, this is what `ping`
and `traceroute` use. It's fine.


Cheers,
Dick Johnson

Penguin : Linux version 2.4.1 on an i686 machine (797.90 BogoMips).

I was going to compile a list of innovations that could be
attributed to Microsoft. Once I realized that Ctrl-Alt-Del
was handled in the BIOS, I found that there aren't any.


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