linux-kernel - Re: [PATCH] netfilter: use per-cpu spinlock rather than RCU

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Message-ID: <b6a2187b0904140951r3c6a41fdnc26b149202bdfa84@mail.gmail.com>
Date:	Wed, 15 Apr 2009 00:51:59 +0800
From:	Jeff Chua <jeff.chua.linux@...il.com>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	Patrick McHardy <kaber@...sh.net>, paulmck@...ux.vnet.ibm.com,
	David Miller <davem@...emloft.net>, paulus@...ba.org,
	mingo@...e.hu, torvalds@...ux-foundation.org, laijs@...fujitsu.com,
	jengelh@...ozas.de, r000n@...0n.net, linux-kernel@...r.kernel.org,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	benh@...nel.crashing.org
Subject: Re: [PATCH] netfilter: use per-cpu spinlock rather than RCU

On Tue, Apr 14, 2009 at 11:49 PM, Eric Dumazet <dada1@...mosbay.com> wrote:
> Stephen Hemminger a écrit :
>> On Tue, 14 Apr 2009 16:23:33 +0200
>> Eric Dumazet <dada1@...mosbay.com> wrote:
>>
>>> Patrick McHardy a écrit :
>>>> Stephen Hemminger wrote:
>>>>> This is an alternative version of ip/ip6/arp tables locking using
>>>>> per-cpu locks.  This avoids the overhead of synchronize_net() during
>>>>> update but still removes the expensive rwlock in earlier versions.

Tested. Loaded as fast as 2.6.29.

> Here is an updated patch ontop of yours, with the smp_wmb() in xt_replace_table() :

Tested as well. Loaded as fast as 2.6.29.

Thanks,
Jeff.
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