Forum Discussion

Daniel_55334's avatar
Daniel_55334
Icon for Altostratus rankAltostratus
May 27, 2008

What exactly does FastL4 profile do?

Customer have to load balance a webserver. Using default settings it takes more than 10 seconds to completely load the webpage. After using the FastL4 profile it takes only 3 seconds. So what does it ...
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Cspillane_18296's avatar
Cspillane_18296
Icon for Nimbostratus rankNimbostratus
Jul 30, 2010
Hello all,

 

 

@iRuleYou, I have taken a look at the doc you mention and I believe that if you use (as you describe) "SNAT auto map on a VS with the default FastL4 profile enabled" any traffic NOT matching the SNAT would be treated in FULL PVA mode (all packets accelerated) and any packets which DO match the SNAT will be treated as 'Assisted', meaning the first packet in each connection is processed in software, and each packet thereafter is accelerated.

 

 

From looking at the PDF, it seems that using an iRule with the VS will drop it to 'Assisted' PVA functionality, so the first packet can be dealt with in software. I hope this clears things up for you, if not drop a reply and I'll do my best to respond soon (or perhaps after the weekends debauchery).

 

 

@Yiu Tong Daniel Lo, I've seen problems like this and as Paul Szabo mentioned, profiles are the best place to start - for example using 'wan optimised' profile where a 'lan optimized' profile should be can have a dramatic performance impact.

 

 

Thanks,

 

 

Chris