[j-nsp] slow telnet session

[John Kristoff]

I seemed to have missed this reply.

On Wed, 28 May 2003 16:59:48 +0100
"Farhan Memon" <faz at netfm.co.uk> wrote:

> > On Tue, May 27, 2003 at 06:52:55AM -0500, John Kristoff wrote:
> > | On Tue, May 27, 2003 at 08:27:51AM +0800, Michael Feng wrote:
> > | > Actually I telnet to the M5 by ip address, not by name.
> > | > You still suggest to check external DNS server?
> > | 
> > | What is the processor utilization?  Is the router doing a 
> > large amount 
> > | of processing (e.g. rate limiting)?  It may be busy doing other 
> > | things.
> > 
> > hardware based routers have the advantage that processing of 
> > packets i.e. forwarding/rate-limiting etc. does not harm the 
> > control-plane CPU;
> > 
> > router health metrics like you may know from other router 
> > vendors equipment may not be relevant in a hardare based router;

However, I have noticed some initial slowdown in the login process.  For
example, when large amounts of UDP traffic arrive on a gig interface
(say 100 Mb/s or more) and its rate-limited on ingress to something much
less (say about 10 Mb/s), the processor goes to about 50% and stays
there until the traffic subsides to somewhere below the rate limit
threshold.

Once logged in, response time is fine, but in my experience the initial
connection lag is noticeable.

Note: I do appreciate that this is still much better than a leading
competitor's survivability.

John