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Message-ID: <20170731161007.61c2d958@xeon-e3>
Date: Mon, 31 Jul 2017 16:10:07 -0700
From: Stephen Hemminger <stephen@...workplumber.org>
To: Shaohua Li <shli@...nel.org>
Cc: netdev@...r.kernel.org, davem@...emloft.net, Kernel-team@...com,
Shaohua Li <shli@...com>, Wei Wang <weiwan@...gle.com>
Subject: Re: [RFC net-next] net ipv6: convert fib6_table rwlock to a percpu
lock
On Mon, 31 Jul 2017 10:18:57 -0700
Shaohua Li <shli@...nel.org> wrote:
> From: Shaohua Li <shli@...com>
>
> In a syn flooding test, the fib6_table rwlock is a significant
> bottleneck. While converting the rwlock to rcu sounds straighforward,
> but is very challenging if it's possible. A percpu spinlock is quite
> trival for this problem since updating the routing table is a rare
> event. In my test, the server receives around 1.5 Mpps in syn flooding
> test without the patch in a dual sockets and 56-CPU system. With the
> patch, the server receives around 3.8Mpps, and perf report doesn't show
> the locking issue.
>
> Cc: Wei Wang <weiwan@...gle.com>
You just reinvented brlock...
RCU is not that hard, why not do it right?
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