From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Re: [iproute PATCHv2 0/2] Netns performance improvements Date: Wed, 6 Jul 2016 21:22:57 -0700 Message-ID: <20160706212257.4e35d0fb@xeon-e3> References: <1467730280-17493-1-git-send-email-phil@nwl.cc> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: Stephen Hemminger , "Eric W . Biederman" , netdev@vger.kernel.org To: Phil Sutter Return-path: Received: from mail-pa0-f54.google.com ([209.85.220.54]:36691 "EHLO mail-pa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750720AbcGGEWs (ORCPT ); Thu, 7 Jul 2016 00:22:48 -0400 Received: by mail-pa0-f54.google.com with SMTP id uj8so2544458pab.3 for ; Wed, 06 Jul 2016 21:22:48 -0700 (PDT) In-Reply-To: <1467730280-17493-1-git-send-email-phil@nwl.cc> Sender: netdev-owner@vger.kernel.org List-ID: On Tue, 5 Jul 2016 16:51:18 +0200 Phil Sutter wrote: > Stress-testing OpenStack Neutron revealed poor performance of 'ip netns' > when dealing with a high amount of namespaces. The cause of this lies in > the combination of how iproute2 mounts NETNS_RUN_DIR and the netns files > therein and the fact that systemd makes all mount points of the system > shared. > > Changes since v1: > - Added Suggested-by tag to patches. > > Phil Sutter (2): > ipnetns: Move NETNS_RUN_DIR into it's own propagation group > ipnetns: Make netns mount points private > > ip/ipnetns.c | 12 +++++++++++- > 1 file changed, 11 insertions(+), 1 deletion(-) > I want an ack for Eric on this, it seems a little risky