Re: TCP stream processing performance

[Kevin Wang <kevin.wang () Istuary com>]

Thank you, Victor and Albert!

Is the flushing taking a lot of CPU time? The time spent (shown in the performance profile) is mostly on memory 
operation rather than CPU calculation, right?

Not sure if I expressed it clearly. The background is that I am currently starting to do some research on improving the 
overall intrusion detection performance and if necessary, we can use hardware acceleration on the processing. I know we 
can do some thing on the pattern matching side with extra hardware like TCAMs. However, for the preprocessor part, is 
there any way/need to improve it using extra special hardware other than more memory and processors?

Best Regards,
Kevin


From: Victor Roemer [mailto:viroemer () cisco com]
Sent: June 27, 2016 10:33 PM
To: snort-users () lists sourceforge net
Subject: Re: [Snort-users] TCP stream processing performance


Hi Kevin,



You are correct, while there are additional overheads such as host tcp state emulation, preprocessor alerts and stream 
normalizations probably accurate to say that the actual reassembled packet flushing etc.. is the most intensive.
On 6/27/16 5:59 PM, Kevin Wang wrote:
Hello,

I am looking at Snort performance and I found that in the Preprocessor profile statistics, "s5" or "s5tcp" is taking a 
lot of time. My understanding is that s5tcp is for TCP stream reassembly and the time taking is mostly due to the 
buffering and mis-ordered packets. The actually processing by the CPU is relatively short. Is my understanding correct 
or there is other intense processing going on?

Thanks,
Kevin
Email Disclaimer & Confidentiality Notice
This message is confidential and intended solely for the use of the recipient to whom they are addressed. If you are 
not the intended recipient you should not deliver, distribute or copy this e-mail. Please notify the sender immediately 
by e-mail and delete this e-mail from your system. Copyright (c) 2016 by Istuary Innovation Labs, Inc. All rights 
reserved.





------------------------------------------------------------------------------

Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San

Francisco, CA to explore cutting-edge tech and listen to tech luminaries

present their vision of the future. This family event has something for

everyone, including kids. Get more information and register today.

http://sdm.link/attshape




_______________________________________________

Snort-users mailing list

Snort-users () lists sourceforge net<mailto:Snort-users () lists sourceforge net>

Go to this URL to change user options or unsubscribe:

https://lists.sourceforge.net/lists/listinfo/snort-users

Snort-users list archive:

http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users



Please visit http://blog.snort.org to stay current on all the latest Snort news!

Email Disclaimer & Confidentiality Notice
This message is confidential and intended solely for the use of the recipient to whom they are addressed. If you are 
not the intended recipient you should not deliver, distribute or copy this e-mail. Please notify the sender immediately 
by e-mail and delete this e-mail from your system. Copyright (c) 2016 by Istuary Innovation Labs, Inc. All rights 
reserved.

------------------------------------------------------------------------------
Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San
Francisco, CA to explore cutting-edge tech and listen to tech luminaries
present their vision of the future. This family event has something for
everyone, including kids. Get more information and register today.
http://sdm.link/attshape

_______________________________________________
Snort-users mailing list
Snort-users () lists sourceforge net
Go to this URL to change user options or unsubscribe:
https://lists.sourceforge.net/lists/listinfo/snort-users
Snort-users list archive:
http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users

Please visit http://blog.snort.org to stay current on all the latest Snort news!