It's really difficult to give you an answer without knowing more about your
topology or the utilization segments as they contend for bandwidth. One
thing that you should keep in mind however is that every frame destined for
a PC (and every broadcast transmitted over that LAN segment) creates an
interrupt that must be processed by the CPU of the end system. The load on
a CPU (how much ability it has to process the network-generated interrupts)
definitely has an impact on how network access can appear faster or slower.
It always really boggled my mind that 20 some computers on a hub vying for a
10 Mbps uplink to the school's network terminating in a single 10 Mbps
shared hub port would absolutely kick butt over computers in labs where each
computer was plugged into the single "terminating" hub. You would think all
the contention experienced prior to getting to that final (common-point) hub
would impair access--but access was actually better. I didn't twig on the
reason for that until I upgraded my home PC. With both my computers sitting
side-by-side, the newer PC brought up web pages far faster than my old PC.
BEST YET however, now was that my Videon cable modem service was JUST AS
FAST as my dad's Shaw @ Home cable modem service. Darn I hate it when he's
got better network access than I do!
Something to think about--network performance isn't just something affected
by bandwidth, but by a PC's capability to process interrupts.
-----Original Message-----
From: Germain, PJ [mailto:[EMAIL PROTECTED]]
Sent: February 19, 2001 1:12 PM
To: '[EMAIL PROTECTED]'
Subject: RE: Citrix is faster via Internet than LAN/WAN
They are all DPEN600s or better. But, mostly all are DPEN600.
600MhZ with 130 MB RAM.
-----Original Message-----
From: Leigh Anne Chisholm [mailto:[EMAIL PROTECTED]]
Sent: Monday, February 19, 2001 1:52 PM
To: Germain, PJ
Subject: RE: Citrix is faster via Internet than LAN/WAN
What processors are installed on the systems accessing the server
internally? Externally? You may not understand my question, but humour me.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Germain, PJ
Sent: February 19, 2001 8:46 AM
To: '[EMAIL PROTECTED]'
Subject: Citrix is faster via Internet than LAN/WAN
Hello all !
I'm hoping someone out there can help me with this. We are stumped.
We are running the latest version of Citrix on an 8 server ( Proliant 6400)
farm.
Internally, we get to it via a couple of 2948G switches and a 3660 Core
Router.
But, if I go to one of our remotes sites that has a DSL connection to the
Internet, they access our Citrix farm through our 2612 Internet router, then
a Catalyst 2900 switch (DMZ), then through our PIX, then another 2948G, BUT
they apparently bypass the 3660 and get to the farm.
External access has much quicker response times than internal. The only
difference I see is the 3660 router.
We have 30 WAN sites and about 150 LAN hosts working through the 3660, but
the CPU usage and Memory are not hurting. Could this difference just be a
"traffic shaping" issue or is there something that I am just missing??? We
have only a basic config on the 3660.
Any assistance would be much appreciated.
Thank you very much, in advance.
P.J. Germain
Network Support Engineer
Cooper / T. Smith
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