linux-kernel - Re: [PATCH v2 0/3] Don't use RCU for x

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Message-ID: <20210315174217.GA25425@salvia>
Date:   Mon, 15 Mar 2021 18:42:17 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Mark Tomlinson <mark.tomlinson@...iedtelesis.co.nz>
Cc:     kadlec@...filter.org, fw@...len.de, subashab@...eaurora.org,
        netfilter-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/3] Don't use RCU for x_tables synchronization

On Mon, Mar 08, 2021 at 02:24:10PM +1300, Mark Tomlinson wrote:
> The patches to change to using RCU synchronization in x_tables cause
> updating tables to be slowed down by an order of magnitude. This has
> been tried before, see https://lore.kernel.org/patchwork/patch/151796/
> and ultimately was rejected. As mentioned in the patch description, a
> different method can be used to ensure ordering of reads/writes. This
> can simply be done by changing from smp_wmb() to smp_mb().

Applied.