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Cisco CSS 11501 delayed recieve of .SWF content through VIP

CSS 11501

8.10.2.05

We have a client with a basic layer-4 content rule, no advanced balance/sticky sessions, leastconn. Using Firebug for Firefox, I've tested a website containing several and  noticed that there is a noticeable delay (roughly an added 1-2  seconds) specifically in the client receiving some of the .SWF content  (about 6 files at around 100KB each)  from the VIP address, but not when called directly from any one of the the servers directly. From the servers directly, all .SWF content is downloaded and received by the firefox client in around 300ms each. When accessing the VIP however, they take anywhere between 300ms and 2 full seconds, the average usually landing in the middle of that range.

Is this the expected performance of the CSS?

service vm1
  ip address <server.address>
  keepalive type http
  keepalive uri "/check.txt"
  active.

service vm2
  ip address <server.address>
  keepalive type http
  keepalive uri "/check.txt"
  active

service vm3
  ip address <server.address>
  keepalive type http
  keepalive uri "/check.txt"
  active

service vm4
  ip address <server.address>
  keepalive type http
  keepalive uri "/check.txt"
  active

  content customer_vip1
    vip address <vip.address>
    no persistent
    balance leastconn
    add service vm1
    add service vm2
    add service vm3
    add service vm4
    protocol tcp
    port 80
    active

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: Cisco CSS 11501 delayed recieve of .SWF content through VIP

The content rule being L4, once the loadbalancing decision is made with the SYN packet, the connection is simply switched like any normal switch device.  So, the CSS does not even know this HTTP or that the file is .swf.

In other words, it should work the same no matter what the type of traffic and therefore a 2sec delay is not normal.

Did you capture a sniffer trace on client and server when going through the CSS to see what is happening ?

Gilles.

1 REPLY
Cisco Employee

Re: Cisco CSS 11501 delayed recieve of .SWF content through VIP

The content rule being L4, once the loadbalancing decision is made with the SYN packet, the connection is simply switched like any normal switch device.  So, the CSS does not even know this HTTP or that the file is .swf.

In other words, it should work the same no matter what the type of traffic and therefore a 2sec delay is not normal.

Did you capture a sniffer trace on client and server when going through the CSS to see what is happening ?

Gilles.

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