netdev - Re: [PATCH net 1/3] rhashtable: don't test for shrink on insert, expansion on delete

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Date:	Fri, 20 Feb 2015 11:59:55 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Daniel Borkmann <daniel@...earbox.net>
Cc:	davem@...emloft.net, johunt@...mai.com, netdev@...r.kernel.org,
	Ying Xue <ying.xue@...driver.com>
Subject: Re: [PATCH net 1/3] rhashtable: don't test for shrink on insert,
 expansion on delete

On 02/20/15 at 12:53am, Daniel Borkmann wrote:
> Restore pre 54c5b7d311c8 behaviour and only probe for expansions on inserts
> and shrinks on deletes. Currently, it will happen that on initial inserts
> into a sparse hash table, we may i.e. shrink it first simply because it's
> not fully populated yet, only to later realize that we need to grow again.
> 
> This however is counter intuitive, e.g. an initial default size of 64
> elements is already small enough, and in case an elements size hint is given
> to the hash table by a user, we should avoid unnecessary expansion steps,
> so a shrink is clearly unintended here.
> 
> Fixes: 54c5b7d311c8 ("rhashtable: introduce rhashtable_wakeup_worker helper function")
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> Cc: Ying Xue <ying.xue@...driver.com>

Acked-by: Thomas Graf <tgraf@...g.ch>
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