20 Jun
2009
20 Jun
'09
11:03 a.m.
Well, you did want us to test it out and try and break it, lol.
Just glad I didn't bring it down completely.
Is there a way to adjust the retransmit time depending on user location, or is that
impossible / too complicated?
Or will it be more friendly to everyone once it is increased a little?
Regards,
Andrew B
aliensrcooluk at yahoo.co.uk
--- On Sat, 20/6/09, Michael B. Brutman <mbbrutman-cctalk at brutman.com> wrote:
From: Michael B. Brutman <mbbrutman-cctalk at brutman.com>
Subject: Re: PCjr Telnet BBS Test
To: "On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
Date: Saturday, 20 June, 2009, 4:55 PM
Andrew Burton wrote:
Yeah, I dropped by and had a blast (I'm
Lonewolf10).
A neat all round experience. Just hope I don't get hooked on BBS's now! :)
Regards,
Andrew B
aliensrcooluk at yahoo.co.uk
Your connection was interesting - I noticed it was driving my TCP/IP stack nuts.? (It was
retransmitting a lot of packets while you were online - far more than normal.)
Your message about being on a USB modem made me feel slightly better about it.? That, and
being in the UK probably is just causing a very long latency.? My retransmit timeout on
the TCP/IP packets is probably too low ...
Mike
20 Jun
20 Jun
4:16 p.m.
Andrew Burton wrote:
Well, you did want us to test it out and try and break
it, lol.
Just glad I didn't bring it down completely.
Is there a way to adjust the retransmit time depending on user location, or is that
impossible / too complicated?
Or will it be more friendly to everyone once it is increased a little?
Regards,
Andrew B
aliensrcooluk at yahoo.co.uk
Cosam and I were talking about it and the right neurons fired in my brain.
Back in December I made a change to the way I measure elapsed time. The
change gave me like a 30% performance improvement because my original
code was so bad, and the new code was counting timer ticks which is
pretty easy. When I made the change I changed all of my units of time
measurement from 100ths of seconds to milliseconds.
Except in the configuration file that defines the timeouts for the BBS. :-)
The result is that I'm retransmitting packets if I don't get an
acknowledgment in 0.4 seconds, not the 4 seconds that I intended. Which
explains why your particular modem connection was driving the
retransmits so hard. Most broad-band users don't have that problem.
It's not bad enough to stop and restart the BBS, but it definitely is
exercising that path in the code pretty hard.
Mike
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