Re: PTF FTP download speed

[DrFranken <midrange@xxxxxxxxxxxx>]

We also have 'big pipes' to the internet and for quite a while would see 
download speeds of 600 or 700 K.  Then something changed, I suspect 
routing and suddenly we track about 2800KB.

ALSO Be aware there is a limit to how fast one single FTP session can go 
across the net and more hops is NOT better as you may suspect.

Note that I said SINGLE. So set up your batch jobs to run in parallel, 
each getting a single image. With this we get pretty much the same speed 
on every file and I've had as many as a dozen running all at once with 
only minor reduction in individual file performance.

As Rob mentioned use CHGTCPA to increase the buffers there too they 
helps on these many hop transfers.

        - Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

On 1/19/2016 3:21 PM, rob@xxxxxxxxx wrote:

> Even though we have a smoking hot internet connection I experience your
> results also.  You may want to prompt CHGTCPA and see what you have for
> TCP receive buffer size
> TCP send buffer size .
> I swore I changed these up to 65535 at our last IPL but they seem to be
> back down to 8192.  I just changed it on the fly.  Others have encouraged
> me to do so.  There's even a Websphere install thing that I've seen which
> encourages you to kick it up to 65535.
> I have literally ordered them on physical media and have them beat the
> internet.  I suggest you run this in batch so that you can disconnect your
> session at night.  Or use your HMC remote console capability to do it that
> way.
>
>
> Rob Berendt