[Winpcap-users] NPF Device Driver

Alessandro Capucci alessandro at totalwire.it
Tue Apr 14 00:20:42 PDT 2009



10Gb FULL

Alessandro


> 
> ----- Original Message ----- 
> From:
"Alessandro Capucci" <alessandro at totalwire.it> 
>
To: "Gianluca Varenni" <gianluca.varenni at cacetech.com> 
> Cc: <winpcap-users at winpcap.org> 
> Sent: Monday,
April 13, 2009 12:35 PM 
> Subject: Re: [Winpcap-users] NPF Device
Driver 
> 
> 
> Hi, 
> I think to use
kernel buffer used percentage to investigate the 
> corretct size
to set to the kernel buffer... 
> 
> BUT.... I begin to
suspect that WinPCap driver is not the good 
> solution for try to
investigate 10GBit DPI (deep packet inspection). 
> 
> I
think that I'll try to develope a NDIS 6.2 protocol driver to 
>
analize if exists a possibility to develope a 10GBit DPI using a not 
> extreme expensive device like DAG (quite 30K$) but using intel low

> cost device (2K$). 
> 
> Do you think that
ther's a possibility to investigate 10Gbit packet 
> with a
Win2008 server + NDIS 6.2 protocol driver and a very good 
>
server hardware (quad core, ecc... )? 
> 
> --GV-- 
> I think you will end up with something like winpcap. Are you
looking to 
> work 
> at full 10Gbps speed or just
4-5Gbps? 
> 
> Have a nice day 
> GV 
>

> 
> 
> 
> 
> Tnk for your
support, 
> Alessandro 
> 
> Il giorno 13/apr/09,
alle ore 20:22, Gianluca Varenni ha scritto: 
> 
>>
Answers inline, marked as "--GV--" 
>> 
>>
Have a nice day 
>> GV 
>> 
>> PS: please
reply to the mailing list as well. 
>> 
>> 
>> ----- Original Message ----- From: Alessandro Capucci 
>> To: Gianluca Varenni 
>> Sent: Saturday, April 11,
2009 5:03 AM 
>> Subject: Re: [Winpcap-users] NPF Device Driver

>> 
>> 
>> Tnk, I reply to you inline in
this mail in RED. 
>> 
>> 
>> 
>> 
>> Il giorno 10/apr/09, alle ore 21:12, Gianluca
Varenni ha scritto: 
>> 
>> 
>> 
>> ----- Original Message ----- 
>> From: Alessandro
Capucci 
>> To: winpcap-users at winpcap.org 
>> Sent:
Friday, April 10, 2009 3:18 AM 
>> Subject: [Winpcap-users] NPF
Device Driver 
>> 
>> 
>> Hello to every
body, 
>> I'm new in WinPCap library... I'm study it for an
interesting new 
>> project... 10GBit deep packet inspection.
I'm try to connect directly 
>> with WinPCap NPF driver for
best performance. All work fine on my 1GBit 
>> adapter! Next
week I'll hope to star test with 10GBit adapter. 
>> 
>> By "connecting directly to the WinPcap Driver" you
mean calling the 
>> Packet API directly? 
>> ->
YES, I'm connecting directly to NPF driver via Packet32.c interface 
>> (I 
>> haven't use Packet.dll). I'm using Vista, but
next week I'll try 
>> Windows 
>> Server 2008 to
take advantage of NDIS 6.2 and RSS. 
>> 
>> --GV--

>> I wouldn't actually do that. Unless you modify npf.sys to
become an 
>> NDIS 
>> 6 protocol driver, npf.sys is
an NDIS 5 driver. On Vista/2008 NDIS5 is 
>>
"emulated" on top of NDIS6 with an adaptation shim. So you might

>> actually 
>> incur into a perf hit. 
>> --GV-- 
>> 
>> I've some question: 
>> 
>> 0) Do you think that NPF driver with a good
hardware can be able to 
>> capture 10GBit ethernet packet
without sensible packet lost ? 
>> 
>> No, I don't
think so. Capturing at 10Gbps, expecially in the worst case 
>>
i.e. 64byte packets, it's an extremely challenging task. Even custom 
>> capture cards (which cost thousands of dollars) have a very
hard time 
>> dealing with such an amount of packets. 
>> -> Tnk, i'll try benchmark WinPCap NPF Driver with
generalpurpose 
>> ethernet adapter like PCI-Express Intel®
10 Gigabit XF SR Server 
>> Adapters 
>> (with RSS
enabled) VERSUS an specialized card like DAG by Endace. 
>> 
>> 
>> 1) Packet.dll functions are callable in
multithread applications ? For 
>> example can I call
PacketReceivePacket or PacketGetStats in two 
>> different
concurent thread on the same device ? Are serialized ? 
>> In
general the functions are not thread safe when working on the same 
>> LPADAPTER structure. 
>> ->Ok tnk, I'll put it in
critical section. 
>> 
>> --GV-- 
>> If
performance is your main objective, then putting a critical section 
>> might again hurt performance. I would be careful with that. 
>> 
>> --GV-- 
>> 
>> 
>> 2) WinPCap NPF drive is able to take advantage of RSS (Receive
Side 
>> Scaling) availble in Win2008 server 
>>
(http://msdn.microsoft.com/en-us/library/ms795609.aspx)? 
>>
No. 
>> ANOTHER QUESTION: 
>> Next week I'll try to
introduce another value in the information 
>> callback, not
only Packet Received and Packet Dropped but percentage of 
>>
use of the kernel circular buffer for CPU. I think that this value 
>> could 
>> be usefull to tuning Kernel side buffer
size. 
>> Do you think that could be usefull to introduce in
your public 
>> distribution? 
>> 
>> 
>> --GV-- 
>> How would you use it? 
>> 
>> GV 
>> 
>> --GV-- 
>> 
>> 
>> 
>> 
>> Have a nice day

>> GV 
>> 
>> 
>> Tnk you
very much! 
>> Alessandro 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> _______________________________________________ 
>>
Winpcap-users mailing list 
>> Winpcap-users at winpcap.org 
>> https://www.winpcap.org/mailman/listinfo/winpcap-users 
> 
> 


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