There'a absolutely no links between snapshot.ntop.org and my sites, www.ntopsupport.com and www.burtonstrauss.com/pmwiki/pmwiki.php?pagename=Ntop.HomePage (the 'Wiki'). Sorry...
The person who used to maintain snapshot appears to have moved on to other things. I have some admin rights so I occasionally cleanup the FAQ entries and news, but I don't have rights to fix anything else... -----Burton > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of > Grilli, Laurent > Sent: Wednesday, February 11, 2004 5:29 PM > To: [EMAIL PROTECTED] > Subject: RE: [Ntop] Memory usage survey > > > Thanks again Stanley, > > Sorry guys, i was trying to look at the website snapshot.ntop.org > after the > FAQ(certainly down for the wikki setup) and I forget that the FAQ was > sleeping on my hard drive...i go to the corner before Burton shout at me ! > > Laurent Grilli > > -----Original Message----- > From: Stanley Hopcroft [mailto:[EMAIL PROTECTED] > Sent: jeudi 12 f�vrier 2004 0:04 > To: [EMAIL PROTECTED] > Subject: Re: [Ntop] Memory usage survey > > Dear Sir, > > I am writing to thank you for your letter and say, > > On Wed, Feb 11, 2004 at 11:29:59PM +0100, Grilli, Laurent wrote: > > Dear Burton, > > > > > > Looking to the back traffic on ntop, ntop dev, i found few articles > > about memory (old version of ntop) more about memory leak,...and also > > the use of the switch -C for disabling feature (for a user with 256 > > Mb) > > > .. snip .. > > > > So is it possible for people to tell me some tips/guidelines, i know > > that it's not so evident as it depends of the topology, number of > > hosts, traffic...peak, average use of the bandwidth. I'm going to > > upgrade anyway this box to a bi xeon with 2 gb of memory but would it be > enough... > > > > > This part of the docs/FAQ may help > > ' > Q. So ntop's memory usage is dependent upon? > > A. ntop's memory usage for host tables depends on the # of hosts > it sees in > packet traffic. This is NOT, repeat NOT controllable by ntop in > ANY way. If > a user kicks off a port scan, 100s of hosts appear. If somebody > does a DOS > attack against you, 1000s of hosts 'appear'. If a user searches Kazza for > an obscure song, it can probe 4K hosts. etc. > > Lots of those hosts appear, have a few bytes of traffic and then > disappear. > Each host has a variable amount of memory - there's a base structure, some > optional counter structures and a large # of pointer fields, which may or > may not be valued for any given host. > > It depends on the # of active sessions and a lot of other things, > but 8-20K > is a good guess - I usually use 12K as an guestimating size. > Similarly, sessions may appear and disappear (http: opens a lot, does a > small retrieval and closes them), ssh may last for days. etc. Memory is > consumed tracking them too. > ' > > One of Mr Strauss's cracker of a letter (meaning full of > information) about memory speed and usage dealt with ntop performance > factors and the critical nature of high speed memory. > Of course I can't find it now. > > The bit in the FAQ item that concludes > > 'The moral is that if you're going to use ntop to monitor big fat > links, you > need screaming fast iron.' > > Yours sincerely. > > > > > Thanks in advance > > Laurent Grilli > > Yours sincerely. > > -- > ------------------------------------------------------------------------ > Stanley Hopcroft > ------------------------------------------------------------------------ > > '...No man is an island, entire of itself; every man is a piece of the > continent, a part of the main. If a clod be washed away by the sea, Europe > is the less, as well as if a promontory were, as well as if a manor of thy > friend's or of thine own were. Any man's death diminishes me, because I am > involved in mankind; and therefore never send to know for whom the bell > tolls; it tolls for thee...' > > from Meditation 17, J Donne. > _______________________________________________ > Ntop mailing list > [EMAIL PROTECTED] > http://listgateway.unipi.it/mailman/listinfo/ntop > _______________________________________________ > Ntop mailing list > [EMAIL PROTECTED] > http://listgateway.unipi.it/mailman/listinfo/ntop > _______________________________________________ Ntop mailing list [EMAIL PROTECTED] http://listgateway.unipi.it/mailman/listinfo/ntop
