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Date: Fri, 6 Apr 2007 10:24:33 +0200 From: Eric Dumazet <dada1@...mosbay.com> To: Vasily Averin <vvs@...ru> Cc: "David S. Miller" <davem@...emloft.net>, Patrick McHardy <kaber@...sh.net>, Andrew Morton <akpm@...ux-foundation.org>, netfilter-devel@...ts.netfilter.org, rusty@...tcorp.com.au, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, devel@...nvz.org Subject: Re: [PATCH 2.6.21-rc6] [netfilter] early_drop imrovement On Fri, 06 Apr 2007 12:00:29 +0400 Vasily Averin <vvs@...ru> wrote: > When the number of conntracks is reached ip_conntrack_max limit, early_drop() is > called and tries to free one of already used conntracks in one of the hash > buckets. If it does not find any conntracks that may be freed, it > leads to transmission errors. > However it is not fair because of current hash bucket may be empty but the > neighbour ones can have the number of conntracks that can be freed. With the > following patch early_drop() will search conntracks in all hash buckets. Have you tested your patch in a DOS situation ? Some machines have a huge ip_conntrack_max. A single scan of the whole table might take 1000 ms or even more. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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