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Jérôme_ANGLES's avatar
Jérôme_ANGLES
Icon for Nimbostratus rankNimbostratus
Nov 25, 2014

Delay between two HTTP requests in a common TCP.flow (between 10 - 30 seconds)

I have a long wait on a application configured on a bigip LTM 3900 v10.2.2. I captured the traffic on the bigip and there are a few things i see that seems strange...   On a common tcp.flow, th...
application delivery
design
LTM
performance
What_Lies_Bene1's avatar
What_Lies_Bene1
Icon for Cirrostratus rankCirrostratus
Nov 28, 2014

17KB would be more than one packet, more like 10 or 11. I'm still rather confused about when the delay occurs, from a TCP perspective. Rather than go round in circles with that lets just do a general check.

Firstly, can you confirm what TCP profiles you are using on your Virtual Server and whether they are set to default settings or not. Also confirm that Nagle is turned off.

Secondly can you check the MTU configured on the VLANs involved and let us know.

Thirdly, can you do a ping from the client to the Virtual Server using a 1500 payload size. In Windows this would be 

ping -l 1500 x.x.x.x
. If that doesn't work, keep dropping the size down by 20 till it does. Obviously, note if the time is excessive.

If would also be good to do the same from the server to the F5 if possible?