Re: network bandwidth downs when snort inoine is up

[Victor Julien <lists () inliniac net>]

Matt Jonkman wrote:
> What are you using to test bandwidth?
>
> If you're using one of the common online bandwidth testers, those are
> most often based on latency seen.
>
> Will and Victor, wouldn't the clam preproc cause some latency jitter?
>   
The processing time of the packets gets a lot higher. The time spend
will depend on the packet size, content of the payload and of course the
system load. So yeah I expect there to be larger latency fluctuations...

Cheers,
Victor


> Matt
>
>
> carlopmart wrote:
>   
> > Victor Julien wrote:
> >     
> > > carlopmart wrote:
> > >       
> > > > Victor Julien wrote:
> > > >   
> > > >         
> > > > > carlopmart wrote:
> > > > >     
> > > > >           
> > > > > > Victor Julien wrote:
> > > > > >   
> > > > > >       
> > > > > >             
> > > > > > > carlopmart wrote:
> > > > > > >     
> > > > > > >         
> > > > > > >               
> > > > > > > > Yes: norm_wscale_max 14
> > > > > > > >   
> > > > > > > >       
> > > > > > > >           
> > > > > > > >                 
> > > > > > > This should be ok. Can you past your entire stream4 config?
> > > > > > >
> > > > > > > It doesn't have to be a stream4inline issue though. The number of sigs,
> > > > > > > preprocessors, etc. can also slow things down. Especially the clamav
> > > > > > > preproc.
> > > > > > >
> > > > > > > Regards,
> > > > > > > Victor
> > > > > > >     
> > > > > > >         
> > > > > > >               
> > > > > > I think that the problem is the clamav preprocessor too, but I didn't 
> > > > > > hope that it was so slow ...
> > > > > >
> > > > > >   
> > > > > >       
> > > > > >             
> > > > > What hardware are you using?
> > > > >     
> > > > >           
> > > > My is server is a P4 HT 3.2GHz with 1GB of RAM ...
> > > >   
> > > >         
> > > Normally this hardware should be able to keep up with the connection
> > > even with clamav enabled. I think this hardware should be able to handle
> > > about 10 to 15mbit/s with clamav, although it depends on what else the
> > > box is doing of course. To be sure, could you try to disable clamav and
> > > try again?
> > >
> > > Cheers,
> > > Victor
> > >
> > >       
> > I have tried this Victor, and without clamav preprocessor all works as 
> > expected: bandwidth returns to 310 Kb/s ....
> >
> >     
>
>   


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