RE: Comparison of freebsd and linux [was: snort packet loss rate}

["Michael Scheidell" <scheidell () secnap net>]

>     Box F1                Box F2                Box L1
>     (Freebsd 5.2.1)    (Freebsd 5.2.1)    (Linux 2.6.9)
>
> drop:~80%            ~80%                ~80%
>
> After I made following changes on F1 and L1
>
> on F1
> 1. enable device_polling
> 2. disable hyperthreading
> 3. disable smp and leave only 1 cpu
> 4. enlarge libpcap memory usage
> 5. downgrade libpcap.0.9.4 to 0.8.3 and
>    change the source code
>
> on L1:
> 1. Install mmap libpcap
>
> The results are:
>    Box F1                Box F2                Box L1
>     (Freebsd 5.2.1)    (Freebsd 5.2.1)    (Linux 2.6.9)
>
> drop:~80%            ~80%                ~50%
>
> With no rules and no preprocessors ,they are:
>
>    Box F1                Box F2                Box L1
> peak:0.1%              21%                    0.05%

I am running (in several instances) FBSD 5.4, full snort, community AND
bleeding edge rules and see typical only 5% packet drop.

Maybe about 10% on 4.11 (4.11 didn't handle HTT as well as 5.4)

Not sure why even tcpdump is losing packets on your end.



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