Date: 28 Sep 1999 12:29:17 -0000 From: Ville-Pertti Keinonen <will@iki.fi> To: phk@critter.freebsd.dk Cc: current@FreeBSD.ORG, culverk@culverk.student.umd.edu Subject: Re: just found this Message-ID: <19990928122917.16937.qmail@ns.oeno.com> In-Reply-To: <25751.938520138@critter.freebsd.dk> (message from Poul-Henning Kamp on Tue, 28 Sep 1999 14:02:18 %2B0200)
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> I have been mulling over this issue for some time. My current thinking > is that pending some more well thought out mechanism, the right thing > to do here is to detect the DOS and react to that, not to handicap > the caching in general. > > The easiest way to detect this DOS is probably to keep track of the > > namecache entries > ----------------- > live vnodes > > ratio, and enforce an upper limit on it. That seems like a reasonable approach. If you want to include the other attack I mentioned (I just tried it, got up to > 160000 vnodes), then you have to exclude vnodes that are only live because of v_cache_src entries from the count. BTW: You still haven't committed the v_id patch I sent you in May. Is there any specific reason for this? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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