How to socket accept filters?

[Ronald Klop]

On Fri, 24 Jun 2011 22:17:15 +0200, Luis Neves <luis.neves at gmail.com>  
wrote:

> On 06/24/2011 03:49 PM, Ronald Klop wrote:
>  > On Fri, 24 Jun 2011 15:50:09 +0200, Achilleas Mantzios
>  > <achill at matrix.gatewaynet.com> wrote:
>  >
>  >> Στις Friday 24 June 2011 13:00:24 ο/η Luis Neves έγραψε:
>  >>> Hello,
>  >>>
>  >>> Is there any way to enable accept filters for a socket in  
> Java/FreeBSD?
>  >>> I'm particularly interested in enabling the http accept filter.
>  >>>
>  >>
>  >> You can do it in OS level maybe. ipfw, pf etc...
>  >> I used to run ipfw, but now i switched to pf, it seems more powerful.
>  >
>  > He means accf_http(9) I presume. That is something else than firewall
>  > filtering.
>
> That is correct.
>
>
>  >>> Any pointers?
>  >>> Thanks.
>  >
>  > I have never seen it in use and google is also silent about it. You
>  > could create a patch for openjdk or use some native code in java.
>
> Ok.
>
>  > Out of curiosity: What are you doing that optimizing accept() is worth
>  > the effort?
>
>
> I'm trying to optimize a webserver/adserver that has to deal with  
> several thousand connections. I don't know if optimizing accept() is  
> worth the effort, it seems that several webservers (Nginx, Varnish,  
> Apache, Mongrel, Lighttpd) enable this when running on FreeBSD and I'm  
> hoping they do this for a good reason... but you make a good point, I  
> should measure the effect that enabling accf_http has before going that  
> route.

Did you already try a profiler like jprofiler or yourkit?

Ronald.