Kernel hard_start_xmit performance vs SOCK_RAW performance

Kernel hard_start_xmit performance vs SOCK_RAW performance

[Gallus]

Hi,
what path would you choose to rapidly generate packets:
1. Develop kernel space module and user space client tool.
The tool would call the module through ioctl() passing the packet
contents. The module would then construct sbk buffer and call
hard_start_xmit.

2. Develop only user space client tool
The tool would just sent packets through raw sockets.


I'm wondering if amount of system calls in (1) solution will not be a problem?

Which path is generally better?

-- 
Regards,
Gallus

Re: Kernel hard_start_xmit performance vs SOCK_RAW performance

[Alan Cox]

On Fri, 26 Jun 2009 16:04:04 +0200
Gallus <gall.cwpl@gmail.com> wrote:

> Hi,
> what path would you choose to rapidly generate packets

Documentation/networking/pktgen.txt

Re: Kernel hard_start_xmit performance vs SOCK_RAW performance

[Gallus]

2009/6/26 Alan Cox <alan@lxorguk.ukuu.org.uk>:
> On Fri, 26 Jun 2009 16:04:04 +0200
> Gallus <gall.cwpl@gmail.com> wrote:
>
>> Hi,
>> what path would you choose to rapidly generate packets
>
> Documentation/networking/pktgen.txt

Thank you Alan for the answer.

However, my goal is to generate packets with certain *content* in them.

-- 
Regards,
Gallus
please CC me

Re: Kernel hard_start_xmit performance vs SOCK_RAW performance

[Peter Chacko]

Did you try using PACKET socket interface  from your module  ?
(essentially as fast as hard-start-transmit() path ...there will be
tools that can be used for this purpose....I am not sure of any such
tool though...:-) you need to skip the scheduling (qdiscs) path also..

I think, Linux-net mailing list would be more appropriate to have this
discussion.

Thanks,
Peter

NetDiox computing systems
Bangalore-india
www.netdiox.com
080 2664 0708

On Fri, Jun 26, 2009 at 8:05 PM, Gallus<gall.cwpl@gmail.com> wrote:
> 2009/6/26 Alan Cox <alan@lxorguk.ukuu.org.uk>:
>> On Fri, 26 Jun 2009 16:04:04 +0200
>> Gallus <gall.cwpl@gmail.com> wrote:
>>
>>> Hi,
>>> what path would you choose to rapidly generate packets
>>
>> Documentation/networking/pktgen.txt
>
> Thank you Alan for the answer.
>
> However, my goal is to generate packets with certain *content* in them.
>
> --
> Regards,
> Gallus
> please CC me
> --
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