Re: [Vacm-general] Slow EMP handling

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

On Tue, Jul 24, 2001 at 11:29:06AM -0700, San Mehat wrote:
> We had done some initial investigating into the cyclades product to see
> if this exact thing could be done... basically it appears that the box
> is too underpowered to drive all the ports with the EMP state machine..
Hmmm, that is weird: I guess that with a 50MHz ppc, it is very easy to
control 32 serial ports.
> We noticed that the machine was so underpowered that it was taking a few
> seconds for a connection to be acknowledged as closed by the box.. so
> the port that was being listened() on was showing a connection *well*
> after shutdown() was called on the socket.... not good...
Well, time to look at the source code then.... Hmmm, hands start itching..
It sounds like somebody has programmed the box to generate interrupts
for every port.
This results on 19.2k (the emp speed) in 1920 interrupts per port per
second, that is about 61440 interrupts... Even a pentium will not be
able to handle that.
> The cyclades box looks to be a good solution for serial console
> redirection.. but it just doesn't look like it has the horsepower for
> managing the EMP state machine....
Just a question of software....
Like in the old days. Then they did the same, just with less hardware :).
> -san

> Nope, all of the software that runs on the Cyclades TS1000 (16 port) and
> TS2000 (32 port) term servers is open source. The main piece of software
> that manages the ports is portslave or pslave. If you are curious the
> flash image of exactly what is on them is available for download from
> the Cyclades ftp site.
Yes! Cool!
Now I need the Cyclades itself, and unfortunately we already have serial
console systems, so I cannot request one for my work :(...

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