How to socket accept filters?
ronald-freebsd8 at klop.yi.org
Sat Jun 25 01:49:37 UTC 2011
On Fri, 24 Jun 2011 22:17:15 +0200, Luis Neves <luis.neves at gmail.com>
> 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
> >>> 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.
> > 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
Did you already try a profiler like jprofiler or yourkit?
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