netdev - Re: [v2 PATCH 7/10] rhashtable: Disable automatic shrinking

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Message-ID: <20150323094454.GA12683@gondor.apana.org.au>
Date:	Mon, 23 Mar 2015 20:44:54 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Patrick McHardy <kaber@...sh.net>,
	Josh Triplett <josh@...htriplett.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	netdev@...r.kernel.org
Subject: Re: [v2 PATCH 7/10] rhashtable: Disable automatic shrinking

On Mon, Mar 23, 2015 at 08:39:52PM +1100, Herbert Xu wrote:
> 
> Because with multiple rehashing it's quite easy to convert your
> hash table into a linked list by repeatedly growing and shrinking.
> 
> Multiple rehashing simply cannot work unless you get rid of automatic
> shrinking for the untrusted case.

Actually what I could do is allow automatic shrinking when there
are no outstanding rehashes.  So maybe we could restore this feature
after all.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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