Re: TCP stream processing performance

[Victor Roemer <viroemer () cisco com>]

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
>
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