Re: [Vacm-general] Slow EMP handling

['Ard v. Breemen' <ar...@te...>]

On Wed, Jul 25, 2001 at 03:21:29PM +0200, 'Ard van Breemen' wrote:
> On Tue, Jul 24, 2001 at 11:26:11AM -0700, San Mehat wrote:
> > As I suspected, it looks like you're having a serial protocol issue..
> > The reason that only the cisco boxes are qualified as a *network* based
> > connectivity method for EMP are that they have below 1 ms round trip
> > latency on single byte transactions on their raw ports... The EMP
> > protocol requires a MAXIMUM latency of 2ms per byte.. otherwise it will
> > timeout the byte (and sometimes the fame). It is VERY difficult to
> But how is the byte acked? What happens with modems? If I hook up a
> modem, the round trip will probably exceed that 2 ms due to compression
> and other stuff. We are after all talking about almost 4 byte-times.
Allright...
Debugging using tcpdump and ethereal.
My system send a byte to the portmaster.
1.37 ms later the portmaster acks.
53 ms later the portmasters sends a packet containing data.
Usually 1 byte as a reaction from my system. But sometimes up to 29 bytes.
But always 53 ms...
As if something was nagging... Or at least some timer seems to be involved...
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