Subj : kermit protocol in syncterm
To : Christian Sacks
From : Digital Man
Date : Fri Aug 18 2023 10:31 am
Re: kermit protocol in syncterm
By: Christian Sacks to Digital Man on Fri Aug 18 2023 10:42 am
> On 17 Aug 2023, Digital Man said the following...
>
> DM> And how fast is that? Is possible that the Qodem Zmodem implementation
> DM> is just slower than its Kermit implementation?
>
> Using Zmodem I'm getting about 850,000 cps or about 106KB/s (if my
> conversion is correct) locally using SyncTERM
> Using Kermit I'm getting about 25,900,000 cps or about 3237KB/s (or
> 3.237MB/s) locally using qodem
>
> Both were downloading the same 45MB file from my BBS.
>
> DM> The suggestion was to try Ymodem-G. Ymodem should normally be much
> DM> slower than Zmodem over any kind of decent transport due to its ack/nak
> DM> nature.
>
> Ymodem-G either is broken in mystic or SyncTERM and Mystic don't play well
> as it just locks up the terminal and doesn't do
> anything until I force hang up. Ymodem (non -G) is ~same as Zmodem, maybe a
> little slower.
>
> I just tried Regular Ymodem again and now that seems to be borking up too...
> hmm, might need to restart mystic maybe.
Maybe test with a different BBS software or different protocol driver on the BBS side?
Ymodem-G has almost 0 overhead, so (without compression or other cheats), it's really not possible for Kermit (the protocol) to be faster than Ymodem-G. And Zmodem is only a little slower than Ymodem-G.
So any major speed difference you're seeing (and reporting here) are due to the *implementation* of the protocol on either the sending or receiving side, and not the protocol itself.
--
digital man (rob)
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