i have F5 LTM , 2 G of traffic is shownon monitoring tool to be sent to F5 , but i can see from GUI dashboard that Throuput is 5.3 G plaese note that servers behind F5 have both in & out legs connected to F5 so is this reason why throuput is multiplies of 2 g , & if yes why it is not Just 2*2 = 4 G ?

I'm not 100% on how the F5 figures are calculated but keep in mind, if this is say HTTP, you are sending 2G of requests, the responses will likely be somewhat bigger and certainly won't be the same. I'd read that as 2G in from the 'client', 3.3Gb out to the client from the servers. You're probably better off using Module Statistics > Traffic Summary Statistics to drill down and see stats for client and server side.

Thanks , where on internet can i read about what you mentioned " I'd read that as 2G in from the 'client', 3.3Gb out to the client from the servers. " , as i googled & cannot reach info

I'm not sure what you mean SSHSSH. I mean, I understand that to mean you are sending 2Gb of test requests and as the overall figure is 5.3Gb, you are probably seeing 3.3Gb response data. This is the nature of HTTP; a request will be small in comparison to a response in most cases. As I said Module Statistics > Traffic Summary Statistics will give you the facts.

Thanks , i got it is there something standard explaining approximate numbers about ratio between HTTP request & response Also at my environment servers is accessed by Client through F5 , then server initiate connection to other DB server passing through F5 again to get client request , then response is sent back to Client if i understood then if for ex data is 2 G , i will need throughput as : [ 3.3 ( 2G + Response ) ] * 2 >>>> * 2 because server initiate again through F5 ... am i right ?

Hi SSHSSH I don't think there is any documents describing the ratio between HTTP requests and responses, but maybe it would be time well spent if you used some time on reading about HTTP. When the TCP session is created to a site like google.com, the browser will request the root of the site. This request will usually be a in the size of a few hundred bytes (346 bytes in this case of testing). When the HTML of the site has been returned to the client (in a 605 bytes large packet), the client will begin requesting all the elements of the site that was not delived in that HTML (pictures for example). These elements might not be able to be transferred in one TCP packet, but might require many packets = much bigger reponse than request. I recommend downloading Wireshark and try it out on a very basic site without SSL (will hide all the fun stuff). This can be very informative and quite fun if you like that kind of stuff :) The same goes pretty much for SQL. I don't really know much about SQL traffic patterns, but probably it's a bit more "equal" in terms of up/download. I base this on the fact that even though you might make a query that received a lot of information, you probably also does updates, inserts, deletions where the inital request is actually bigger than the response from the database.

Throughput calculation

21 Replies

SSHSSH_97332
Nimbostratus
Feb 07, 2013
Thanks Thanks Thanks Steve

for the word " [If your issue is resolved, please mark it as such by selecting Resolved in the drop-down near the top right] " .... i cannot find that , can u guide me where is that sothat i mark your post as solution
SSHSSH_97332
Nimbostratus
Feb 07, 2013
How did you draw these diagrams , using Visio ? from where have u got these stencils/ icons ?
What_Lies_Bene1
Cirrostratus
Feb 08, 2013
Don't worry if you can't find the Resolved drop down, even I have trouble sometimes. It's just one of those things.

I did the diagrams using SmartDraw. The stencils are actually Gnome icons, a fair deal of which are designed and drawn by Jakub Steiner (aka Jimmac) in his spare time.
What_Lies_Bene1
Cirrostratus
Feb 08, 2013
I generally get them from here (7Zip required to decompress): https://launchpad.net/ubuntu/+archive/primary/+files/gnome-icon-theme_3.6.2.orig.tar.xz
SSHSSH_97332
Nimbostratus
Nov 30, 2013
i cann't access the above sky Drive link :( https://skydrive.live.com/redir?resid=CDED4624AAE21FEC!136&authkey=!ABoge_TmP7ycGM8
What_Lies_Bene1
Cirrostratus
Nov 30, 2013
Yes, I gave that up after the whole PRISM thing. I'll post it here again sometime later tonight.
What_Lies_Bene1
Cirrostratus
Dec 01, 2013
Arrggh. DC giving me issues.
What_Lies_Bene1
Cirrostratus
Dec 01, 2013
And more...
What_Lies_Bene1
Cirrostratus
Dec 01, 2013
OK, not working it seems. Drop me your email address and I'll mail em.
Scott_McCullo13
Historic F5 Account
Dec 01, 2013
I've fixed the images in your answers by 'what lies beneath'

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Throughput calculation

21 Replies

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