RE: tcp/ip socket slowdown

What is the iSeries program that receives the vb.net sockets?  What SBS
is it running in?  Which memory pool and it's size, activity level?
What is the CPU usage for the entire system during the job and how much
is server job using?  What is the network configuration like, routers,
firewalls?


Christopher Bipes
Information Services Director
CrossCheck, Inc.

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Rick DuVall
Sent: Thursday, May 04, 2006 12:52 PM
To: MIDRANGE-L@midrange. com
Subject: tcp/ip socket slowdown

Hi list,

        I have a vb.net client that communicates with the iSeries using
sockets.
My problem is that the transmission of data is taking too long.  The
client builds a variable length string which contains many self
described data items, including base-64 encoded images, that will
typically be in the 1 -
1.5 meg range total.  The transmission takes around 3 minutes on a 100mb
Ethernet and about the same on a 11mb wireless.  The windows client
notes the time before it 'sends' and after it returns yielding an
elapsed several minutes.  The iSeries only becomes aware of the data
several minutes after the windows client turns it loose, and decomposes
and saves the data in just a few seconds.  The same network will behave
normally for ftp up/downloads.
One of the clients can download a 20meg file in a few seconds - less
time than it takes to save this 1-1.5 meg data.

        Anybody have any suggestions as to where to start?  My iSeries
has :

TCP receive buffer size  . . . .   8192
TCP send buffer size . . . . . .   8192

and the windows is more like 1k but this doesn't seem like enough for
this kind of slowdown...???  I am way not a networking guru. Thanks for
any ideas.