[Info-vax] SMTP chunk sizes

[Jan-Erik Soderholm]

JF Mezei skrev den 2015-03-24 17:19:
> On 15-03-24 06:42, Jan-Erik Soderholm wrote:
>
>> How does a simple plain FTP perform over the same NIC?
>
> I have found that FTP on VMS underperforms...

I do not understand what you are talkning about.
The problems with miss-configured full/half duplex
has nothing to do with "underperforming".


> by large amount...

I have not seen that.

Just tested a 7.3 MB file and it transfers over the 100 Mb/s
network in 00.79 sec with a little over 9 MB/s bandwidth. Between
two Alpha DS20e using standard NICs and nothing besides TCPIP
"out-of-the-box". I think that is as good as it can get without
going to Gb NICs.

What did you do when you saw your findings?

> even when you adjust various FTP logical names. However, the idea is
> good. But unlikely the user will be allowed to test FTP to that SMTP
> server.

There is no reason to test against the SMTP server, of course.
*IF* it is a miss-configured half/full duplex, if will show
against any other server. Like between two VMS boxes...

Miss-configured half/full duplex can be weired. It can work
just well for normal VT-type displays and applications, but
anything doing a little larger transfers (FTP, SMTP, maybe
some printout) might underperform (or rather "hang").