From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH net-next 0/2] sched: refactor NOLOCK qdiscs Date: Thu, 17 May 2018 13:06:45 -0400 (EDT) Message-ID: <20180517.130645.233025265779233333.davem@davemloft.net> References: Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, jhs@mojatatu.com, xiyou.wangcong@gmail.com, jiri@resnulli.us, john.fastabend@gmail.com, mst@redhat.com To: pabeni@redhat.com Return-path: Received: from shards.monkeyblade.net ([184.105.139.130]:59082 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750825AbeEQRGr (ORCPT ); Thu, 17 May 2018 13:06:47 -0400 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: From: Paolo Abeni Date: Tue, 15 May 2018 16:24:35 +0200 > With the introduction of NOLOCK qdiscs, pfifo_fast performances in the > uncontended scenario degraded measurably, especially after the commit > eb82a9944792 ("net: sched, fix OOO packets with pfifo_fast"). > > This series restore the pfifo_fast performances in such scenario back the > previous level, mainly reducing the number of atomic operations required to > perform the qdisc_run() call. Even performances in the contended scenario > increase measurably. > > Note: This series is on top of: > > sched: manipulate __QDISC_STATE_RUNNING in qdisc_run_* helpers Series applied, thank you.