Date: Thu, 26 Jun 2003 03:03:20 +0200 From: =?iso-8859-1?Q?John_B=E4ckstrand?= <sandos@home.se> To: <freebsd-stable@freebsd.org> Subject: Mbuf Clusters on 4.8 Message-ID: <000b01c33b7e$bc37fdd0$0000fea9@sandos>
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Ive been googling quite a bit now for problems with running out of mbuf clusters. Im basically sending a 30k datachunk down 1000-4000 connections, but 1000 is more than enough to quickly fill upp 8192 mbuf clusters. I also tried setting maximum amount of mbuf clusters to 65536, but that only made the box hard-wire 86MB of 96MB RAM, making it just as unsuable as a dead machine. Of course, when the machine runs out of mbuf clusters, it dies. I also found this with google: "Finally, the fact that FreeBSD 3.x panics when it runs out of mbuf clusters is a well-known problem. The solution is to not let it run out of mbuf clusters by configuring a sufficient number for them." >From this it sounds as it is a problem that should be fixed, but it obviously isnt in 4.8. Is this behaviour now considered acceptable? And if so, doesnt this make FreeBSD extremely easy to kill using a simple DOS-attack? Is this "fixed" in any way on 5.1? --- John Bäckstrand
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