netdev - Re: [PATCH net 2/2] rhashtable: remove indirection for grow/shrink decision functions

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Message-ID: <1424888117.5565.113.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 25 Feb 2015 10:15:17 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	Daniel Borkmann <daniel@...earbox.net>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"tgraf@...g.ch" <tgraf@...g.ch>,
	"pablo@...filter.org" <pablo@...filter.org>,
	"johunt@...mai.com" <johunt@...mai.com>,
	"kaber@...sh.net" <kaber@...sh.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net 2/2] rhashtable: remove indirection for grow/shrink
 decision functions

On Wed, 2015-02-25 at 17:49 +0000, David Laight wrote:

> That won't work if someone is managing to break the hash function.
> You need some approximation to the total count as well.
> OTOH there is no point growing the table if the current list isn't 'full'.

Well, if hash function is broken, having 1,000,000 elements in one
bucket will kill your host, even if hash table has 1 million buckets.

Better find this out sooner than later.



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