Date: Fri, 08 Mar 2013 11:12:52 -0800 From: Xin Li <delphij@delphij.net> To: freebsd-pf@FreeBSD.org Subject: Fwd: [patch] Source entries removing is awfully slow. Message-ID: <513A3834.8060504@delphij.net> In-Reply-To: <201303081419.17743.vegeta@tuxpowered.net> References: <201303081419.17743.vegeta@tuxpowered.net>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Hi, This sounds interesting, could someone, please, review this patch and see if it's appropriate? Thanks in advance! - -------- Original Message -------- Subject: [patch] Source entries removing is awfully slow. Date: Fri, 8 Mar 2013 14:19:17 +0100 From: Kajetan Staszkiewicz <vegeta@tuxpowered.net> To: freebsd-net@freebsd.org <freebsd-net@freebsd.org> Hello there! In my enviroment, where I use FreeBSD machines as loadbalancers, after a server is detected as dead, loadbalancer removes the the broken server from a table used in route-to pf rule and then removes Source entries pointing clients to that server, so clients previously assigned to the broken server are re- loadbalanced to alive servers. Each loadbalancer has around 50k Source and 500k State entries. Under those conditions removing a Source from anywhere to a dead server with `pfctl -K 0.0.0.0/0 -K internal.IP.of.server` freezes the machine for a few seconds (or even up to a minute in other datacenter segment, where different services are served, causing thousands instead of just a few hundred States to be matched). Under a DDoS attack, when removing Sources to a server under attack, kernel freezes permanently (I gave up after 10 minutes waiting and restarted the machine). A patch fixing the issue can be found here: http://vegeta.tuxpowered.net/download/link-states-to-src_node.patch - -- | pozdrawiam / greetings | powered by Debian, CentOS and FreeBSD | | Kajetan Staszkiewicz | jabber,email: vegeta()tuxpowered net | | Vegeta | www: http://vegeta.tuxpowered.net | `------------------------^---------------------------------------' _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" -----BEGIN PGP SIGNATURE----- iQEcBAEBCgAGBQJROjg0AAoJEG80Jeu8UPuzkRIH/12pf7eQm/RC5nUSfTyFEPSn yWEG+2R+83oFza7qhpSOyO+qnSQYmqU+ZMZmCHllNymFVGYgBzO9s8Vs/m5ES3+D Z6oiz7Zasca1VnNEfegQE2IyyXxqJ3yScLdDpxbh5wJ3r9lPmQLJgn6QwHxXvPqG elmimfyjCvIOC2ALrggdcc4+xBjcGlpDCmb3CnkosR72I9cwD6fM/xfV9iHY0G/A 8FHfixUe1H4xpSSJiwOA+i0oN4TdFD/hh5JaHBJT4kxbCawxbJtMjazb0XSO+/uP OIWNKJ6EnfodpAFKv8r/yIAHkEtMBVw9y7DC5cwxOo0miCU7PhNSA+BXtDckiVw= =ziec -----END PGP SIGNATURE-----
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