From mboxrd@z Thu Jan 1 00:00:00 1970 From: Florian Westphal Subject: Re: [PATCH nf-next 0/3] netfilter: speed up netns cleanup Date: Mon, 1 May 2017 21:37:25 +0200 Message-ID: <20170501193725.GA24460@breakpoint.cc> References: <20170424133741.2707-1-fw@strlen.de> <20170501092036.GA3476@salvia> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Florian Westphal , netfilter-devel@vger.kernel.org To: Pablo Neira Ayuso Return-path: Received: from Chamillionaire.breakpoint.cc ([146.0.238.67]:43710 "EHLO Chamillionaire.breakpoint.cc" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751316AbdEAThk (ORCPT ); Mon, 1 May 2017 15:37:40 -0400 Content-Disposition: inline In-Reply-To: <20170501092036.GA3476@salvia> Sender: netfilter-devel-owner@vger.kernel.org List-ID: Pablo Neira Ayuso wrote: > On Mon, Apr 24, 2017 at 03:37:38PM +0200, Florian Westphal wrote: > > low hanging fruits to speed up netns cleanup in netfilter. > > We're way too happy to issue expensive synchronize_rcu() all > > over the place. > > > > On my test vm 8 processes doing 32 unshare each finish in ~3 minutes, > > with these patches it gets down to 40 seconds. > > If this is a script, can we place this somewhere to keep an eye on > this? It was based on Andreys sample program but this is enough actually to show the difference: time for x in $(seq 1 100); do unshare -n /bin/true;done