Re: TCP/IP Speed

[Richard B. Johnson]

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.