deri at ntop
Jun 5, 2011, 1:36 AM
Post #6 of 6
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Re: Fwd: Introducing netmap: line-rate packet send/receive at 10Gbit/s
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Kurt
this is also true. Nevertheless the main problem of ntop is that for each packet too many counters are incremented. THis causes the issue. I now want to release the new PF_RING, nProbe is already in good shape, and this summer to focus on ntop again to see if we can address these limitations
Luca
On Jun 5, 2011, at 1:32 AM, Kurt Buff wrote:
> Understood. I believe that memory also becomes an issue under certain
> conditions as well, especially if using things like sticky hosts
> and/or name resolution.
>
> Kurt
>
> On Sat, Jun 4, 2011 at 14:48, Luca Deri <deri [at] ntop> wrote:
>> Kurt
>> I jave forgot to say that ntop (like snort, wireshark and many other apps) are CPU rather than network bound. THis menas that even if you use a FPGA-based card such as Napatech/Endace you won't improve much the speed overall speed as the CPU is the bottleneck. If you want to speed-up ntop (as of today) you need to use nprobe as pre-processor
>>
>> Cheers Luca
>>
>> On Jun 4, 2011, at 7:40 PM, Kurt Buff wrote:
>>
>>> Thank you for that. I'm reading it now.
>>>
>>> Kurt
>>>
>>> On Fri, Jun 3, 2011 at 23:03, Luca Deri <deri [at] ntop> wrote:
>>>> Kurt
>>>> if you want an answer to your question, you can probably read http://luca.ntop.org/10g.pdf
>>>>
>>>> Luca
>>>>
>>>> On Jun 3, 2011, at 1:30 AM, Kurt Buff wrote:
>>>>
>>>>> Is FreeBSD catching up with Linux? Can ntop on FreeBSD be tweaked to
>>>>> use this facility?
>>>>>
>>>>> Not that *my* infrastructure needs it, but inquiring minds want to know...
>>>>>
>>>>> Kurt
>>>>>
>>>>> ---------- Forwarded message ----------
>>>>> From: Luigi Rizzo <rizzo [at] iet>
>>>>> Date: Thu, Jun 2, 2011 at 15:31
>>>>> Subject: Introducing netmap: line-rate packet send/receive at 10Gbit/s
>>>>> To: net [at] freebsd
>>>>> Cc: current [at] freebsd
>>>>>
>>>>>
>>>>> Hi,
>>>>> we have recently worked on a project, called netmap, which lets
>>>>> FreeBSD send/receive packets at line rate even at 10 Gbit/s with
>>>>> very low CPU overhead: one core at 1.33 GHz does 14.88 Mpps with a
>>>>> modified ixgbe driver, which gives plenty of CPU cycles to handle
>>>>> multiple interface and/or do useful work (packet forwarding, analysis, etc.)
>>>>>
>>>>> You can find full documentation and source code and even a picobsd image at
>>>>>
>>>>> http://info.iet.unipi.it/~luigi/netmap/
>>>>>
>>>>> The system uses memory mapped packet buffers to reduce the cost of
>>>>> data movements, but this would not be enough to make it useful or
>>>>> novel. Netmap uses many other small but important tricks to make
>>>>> the system fast, safe and easy to use, and support transmission,
>>>>> reception, and communication with the host stack.
>>>>>
>>>>> You can see full details in documentation at the above link.
>>>>>
>>>>> Feedback welcome.
>>>>>
>>>>> cheers
>>>>> luigi
>>>>> -----------------------------------------+-------------------------------
>>>>> Prof. Luigi RIZZO, rizzo [at] iet . Dip. di Ing. dell'Informazione
>>>>> http://www.iet.unipi.it/~luigi/ . Universita` di Pisa
>>>>> TEL +39-050-2211611 . via Diotisalvi 2
>>>>> Mobile +39-338-6809875 . 56122 PISA (Italy)
>>>>> -----------------------------------------+-------------------------------
>>>>> _______________________________________________
>>>>> Ntop mailing list
>>>>> Ntop [at] listgateway
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>>>>
>>>> ---
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>>>>
>>>>
>>>>
>>>>
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>> ---
>> Due to lack of interest, tomorrow is cancelled - Kaiser Chiefs
>>
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