What latency is normal for a Citrix Netscaler - Virtual Appliance

Posted on 2013-12-05
Last Modified: 2016-10-25
HI There,

We have a customer who is running a citrix solution and while it performs pretty well I've noticed a large amount of latency from the Citrix Netscaler, even from a local device.

Anything else on the network pings at <1ms but the Netscaler is all over the place.

When there are about 50 users connected I've seen it spike randomly to 1000ms, which translates to lag within the Citrix Session.

In my troubleshooting we have found that the latency gets worse the more people are connected.

Does anyone know why it does this, and if there is a good solution to getting it fixed? Or is it something I should not even worry about?

I've attached a screenshot of what I am referring to.

Thanks in advance,

Question by:eXiaWeb
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Accepted Solution

Sekar Chinnakannu earned 405 total points
ID: 39700435
did you enabled qos in your environment ? if you not try to enable and check.
LVL 21

Expert Comment

ID: 39700737
I assume you're talking about a physical appliance, not a VPX ?

Such high latency is not normal. Should you worry? If users complain of session lag, then of course yes.

I would recommend you start with basic network troubleshooting by your network admin. Check for errors on the switchports the device is connected to etc, flow control, network saturation, ...

Author Comment

ID: 39703812
We are using Netscaler VPX.

@ sekarc4u - Are you talking about enabling QoS within our Vmware environment or on the Netscaler itself?
LVL 21

Expert Comment

ID: 39704043
VPX-10, 200, 1000 ?

What are the resources allocated to the VM?

Expert Comment

ID: 39704294
One small information, in our environment the architects came up with a parameter. For a user to have seamless experience in VDI, the latency should be less than or equal to 300ms. Any latency beyond this will be detected as slowness or shaggering experience by end user.
LVL 20

Expert Comment

ID: 39707199
1) Are responce time slow when you use the IP and FQDN?
2) In the Netscalare for your services are you using SSL or SSL Bridging?
3) Are you using Client-IP insertion or Source-IP?
4) How many Virtual Servers does the Netscaler host?
5) What is the Bulid number of the VPX

Author Closing Comment

ID: 40308952
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