Re: [PATCH] Improve behaviour of Netlink Sockets

[Pablo Neira <pablo@xxxxxxxxxxx>]

Hi,

jamal wrote:

> On Sun, 2004-09-19 at 22:58, Herbert Xu wrote:
>  
>
> > AFAICT the problem Pablo is trying to solve is packet loss due to
> > netlink congestion.
> >
> > There might actually be a problem with the kernel not waking up the
> > the user process when we tell it to.  It might even be a scheduling
> > problem.  But we'll need a test-case to assess that.
> >
> >    
> Agreed.
> For a test i typically have something adding say 10K items (actions in
> my case, but could be ipsec policies) and then try to dump them. On my
> xeon i get an overrun after about 6K items are dumped.
>  
yes, this is exactly what I've observed.

Here a link to the tool that I use to stress netlink sockets.

http://eurodev.net/~pablo/netlinkbench-unicast-1.0.tar.gz

We've set a webpage at the university: 
http://perso.ens-lyon.fr/laurent.lefevre/software/netlinkbench/ but the 
link to download the tool is broken, it will be up soon.
I've make also a version for broadcast sockets but it's basically a copy 
and paste of the unicast tool, I can also send you another link with it.
In nlbench-unicast.c there's a macro to set/unset MSG_DONTWAIT flag to 
make it hit my code or not.
regards,
Pablo