Subject: Re: [PATCH RESEND net-next] net: Do synchronize_rcu() in ip6mr_sk_done() only if this is needed

From: Eric Dumazet <[email-masked]>
Date: Tue, 06 Mar 2018 09:20:31 -0800

On Tue, 2018-03-06 at 08:58 -0800, Eric Dumazet wrote:
> 
> To be clear, your patch is fine Kirill,
> 
> I am only sad seeing one can add a synchronize_rcu() in hot path
> without anyone complaining during code review.

lpaa2:~# time for i in {1..1000}; do unshare -n /bin/false;done

real	7m18.911s
user	0m0.185s
sys	0m2.314s

Instead of less than 10 seconds not a long time ago :/