From: "David S. Miller" <davem@davemloft.net>
To: Harald Welte <laforge@gnumonks.org>
Cc: netdev@oss.sgi.com
Subject: Re: [PATCH 2.4] backport neighbour cache redesign
Date: Mon, 4 Oct 2004 14:16:51 -0700 [thread overview]
Message-ID: <20041004141651.153ec066.davem@davemloft.net> (raw)
In-Reply-To: <20041004211158.GG27499@sunbeam.de.gnumonks.org>
On Mon, 4 Oct 2004 23:11:58 +0200
Harald Welte <laforge@gnumonks.org> wrote:
> yes, I remember that email. I didn't think further about it, since I
> got the feeling that there is significant movement to get rid of the
> neighbour cache at some point (if/when there is some fast lookup
> algorithm implemented) - and if we look at ipv6, there is no routing
> cache.
Another idea is to dynamically grow the thresholds based upon usage
just as we do for the hash tables. For example, if we find say %90
of neighbour entries in-use at forced GC time, we increment the
thresholds by some factor.
Note that the "in-use" part is very important, it prevents a DoS
spam from growing the neighbour cache since such traffic causes
neighbour entries to quickly become unused.
prev parent reply other threads:[~2004-10-04 21:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-30 15:47 [PATCH 2.4] backport neighbour cache redesign Harald Welte
2004-10-04 19:17 ` David S. Miller
2004-10-04 20:15 ` Harald Welte
2004-10-04 20:20 ` David S. Miller
2004-10-04 21:11 ` Harald Welte
2004-10-04 21:16 ` David S. Miller [this message]
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