Forum Discussion
Puli
Nimbostratus
Nimbostratusperformance and impact of STREAM Expression
We created a new iRule, which will replace links from one doamin to another in page content.
Below is the iRule
if {[HTTP::header vaule Content-Type] contains "text"}{
STREAM::expression {@http://doaminA@http://doaminB@}
STREAM::enable
}
}
Need clarification on performance.
1) What is the performance impact of using STREAM profile, i understand bigip will look at page content but is it detrimental for the bigip for a website that gets 2 pageviews per seconds. Does it impact bigip ?
2) Does bigip consume more memory with STREAM processing ?
What the impact on memory utilization.
The size of the pages mostly ranges from 1-1.5MB
Would appreciate if anyone is using in production with lot more pageviews.
Appreciate feedback and comments.
thanks,
Puli.
PuliAny thoughts ? appreciate any thoughts and feedback.
Our BigIP LTM admin is concerned about performance using the STREAM profile.
Wanted if other people have used it sucessfully without issues.
hooleylistCirrostratus
Hi Puli,
I haven't done or seen any stream specific performance testing. I've implemented it at a number of customer sites though. I wouldn't add the iRule to a unit which is already at 80 or 90%. But I'd be confident in using it on a lower unit with lower utilization.
Make sure to disable the stream filter in HTTP_REQUEST in your rule though:when HTTP_REQUEST { Disable the stream filter by default on all requests STREAM::disable } when HTTP_RESPONSE { Check if response is text if {[HTTP::header value Content-Type] contains "text"}{ Set expression to find/replace and enable the stream filter STREAM::expression {@http://domainA@http://domainB@} STREAM::enable } }
If you want to get estimates before putting it into production, you could enable timing on the iRule and test it on a test virtual server or test LTM:
http://devcentral.f5.com/wiki/iRules.timing.ashx
Aaron- Pulithanks very much Aaron. appreciate your time.