[Info-vax] SMTP chunk sizes

[Rich Jordan]

On Tuesday, March 24, 2015 at 5:42:05 AM UTC-5, Jan-Erik Soderholm wrote:
> Rich Jordan skrev den 2015-03-24 00:55:
> 
> 
> > Using the windows server as smarthost is fine for small mail so far.
> > However I just sent the same email message that would take 15-20 minutes
> > to get to GMAIL, and would die going to MS in 10 minutes, and it took
> > over 75 minutes to send from the Alpha to the PC (on the same LAN...).
> > That was the 10.8MB body message (all text).  The same text file
> > attached (and so uuencoded) is at 78 minutes now.
> 
> A few things...
> 
> How does a simple plain FTP perform over the same NIC?
> I have seen weird results from miss-configured full/hald duplex
> where such things like FTP close to hangs. Usualy the VMS NIC
> set to full dupl and the switch auto sensing down to half dupl.
> 
> This 10 MB "all text" message, is that a real life example?
> You are not concidering a ZIP of the file before mailing?
> Or putting it in a directory served by WASD (or similar)
> and then only mailing the URL?
> 
> Jan-Erik.
> 
> >
> > Once it got to the windows server it appeared to take about 2 minutes to
> > get to me, so thats good, but we'll have to see if anything can be done
> > about the intersystem pokiness.  I'll try and get a packet trace
> > tomorrow.
> >
> > And I think the scanners and PDF generators can just send direct to the
> > PC server too.  We'll see.
> >
> > Thanks all for the info.
> >
> > Rich
> >

77MB file FTP pull to the PC running the SMTP server:  14.4 seconds (4876 KBps)
Same file pushed back to the Alpha:  49.61 seconds (1416 Kbps)

Both much much faster than the SMTP transfer was to the same system.  I checked and the extend quantity on the receiving account's home disk is small; bet larger extends would have speeded things up.

The PC doesn't have an FTP server config'd so I can't try a FTP push to it from the Alpha.

No errors logged on switch or Alpha during testing.

Rich