netdev - Re: [PATCH net-next 0/6] netns: speedup netns dismantles

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Message-ID: <20220125100221.3ee4be37@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Tue, 25 Jan 2022 10:02:21 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next 0/6] netns: speedup netns dismantles

On Mon, 24 Jan 2022 12:24:51 -0800 Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> netns are dismantled by a single thread, from cleanup_net()
> 
> On hosts with many TCP sockets, and/or many cpus, this thread
> is spending too many cpu cycles, and can not keep up with some
> workloads.
> 
> - Removing 3*num_possible_cpus() sockets per netns, for icmp and tcp protocols.
> - Iterating over all TCP sockets to remove stale timewait sockets.
> 
> This patch series removes ~50% of cleanup_net() cpu costs on
> hosts with 256 cpus. It also reduces per netns memory footprint.

Applied, thanks, 51d555cfdcc6 ("Merge branch
'netns-speedup-dismantle'") in net-next.