From: Jakub Kicinski <kuba@kernel.org>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: "David S . Miller" <davem@davemloft.net>,
netdev <netdev@vger.kernel.org>,
Eric Dumazet <edumazet@google.com>
Subject: Re: [PATCH net-next 0/6] netns: speedup netns dismantles
Date: Tue, 25 Jan 2022 10:02:21 -0800 [thread overview]
Message-ID: <20220125100221.3ee4be37@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net> (raw)
In-Reply-To: <20220124202457.3450198-1-eric.dumazet@gmail.com>
On Mon, 24 Jan 2022 12:24:51 -0800 Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@google.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.
prev parent reply other threads:[~2022-01-25 18:04 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-24 20:24 [PATCH net-next 0/6] netns: speedup netns dismantles Eric Dumazet
2022-01-24 20:24 ` [PATCH net-next 1/6] tcp/dccp: add tw->tw_bslot Eric Dumazet
2022-01-24 20:24 ` [PATCH net-next 2/6] tcp/dccp: no longer use twsk_net(tw) from tw_timer_handler() Eric Dumazet
2022-01-24 20:24 ` [PATCH net-next 3/6] tcp/dccp: get rid of inet_twsk_purge() Eric Dumazet
2022-02-07 3:02 ` [tcp/dccp] f6408a8641: BUG:KASAN:use-after-free_in_inet_twsk_kill kernel test robot
2022-02-07 3:02 ` kernel test robot
2022-02-07 3:30 ` Eric Dumazet
2022-02-07 3:30 ` Eric Dumazet
2022-01-24 20:24 ` [PATCH net-next 4/6] ipv4: do not use per netns icmp sockets Eric Dumazet
2022-01-24 20:24 ` [PATCH net-next 5/6] ipv6: " Eric Dumazet
2022-01-24 20:24 ` [PATCH net-next 6/6] ipv4/tcp: do not use per netns ctl sockets Eric Dumazet
2022-01-26 16:14 ` Paolo Abeni
2022-01-26 16:24 ` Eric Dumazet
2022-01-26 16:35 ` Paolo Abeni
2022-01-26 18:02 ` Eric Dumazet
2022-01-25 18:02 ` Jakub Kicinski [this message]
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