[Info-vax] SMTP chunk sizes

[Jan-Erik Soderholm]

Rich Jordan skrev den 2015-03-24 17:38:
> 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
>

OK, probably not a ful/half duplex issue then... :-)

I'd switch on the trace and debug in TCPIP SMTP (and use a slightly
smaller file) and see if there are any delays in the SMTP handshaking.

Jan-Erik.