linux-kernel - Re: [PATCH 3/3] Convert the UDP hash lock to RCU

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Date:	Tue, 07 Oct 2008 09:16:13 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
CC:	Corey Minyard <minyard@....org>,
	David Miller <davem@...emloft.net>, dada1@...mosbay.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	shemminger@...tta.com, paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH 3/3] Convert the UDP hash lock to RCU

Evgeniy Polyakov wrote:
> On Mon, Oct 06, 2008 at 06:08:09PM -0500, Corey Minyard (minyard@....org) wrote:
>> Would using SLAB_DESTROY_BY_RCU be ok, or would that be too expensive?
> 
> I tested skb destruction via RCU path, and got 2.5 times worse numbers
> with small-packets-bulk-transfer workload.

Was this with regular RCU freeing? This will cool down the cacheline before
frees. You need SLAB_DESTROY_BY_RCU to keep the objects cache hot.


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