netdev - Re: [PATCH net-next 0/7] net: speedup netns create/delete time

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Message-Id: <20170919.160244.1149642515939268316.davem@davemloft.net>
Date:   Tue, 19 Sep 2017 16:02:44 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, ebiederm@...ssion.com,
        eric.dumazet@...il.com
Subject: Re: [PATCH net-next 0/7] net: speedup netns create/delete time

From: Eric Dumazet <edumazet@...gle.com>
Date: Mon, 18 Sep 2017 12:07:26 -0700

> When rate of netns creation/deletion is high enough,
> we observe softlockups in cleanup_net() caused by huge list
> of netns and way too many rcu_barrier() calls.
> 
> This patch series does some optimizations in kobject,
> and add batching to tunnels so that netns dismantles are
> less costly.
> 
> IPv6 addrlabels also get a per netns list, and tcp_metrics
> also benefit from batch flushing.
> 
> This gives me one order of magnitude gain.
> (~50 ms -> ~5 ms for one netns create/delete pair)

I like it.

Please address the feedback about using skb_put_data() and
resubmit.

Thanks.