From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C0063C2D0C8 for ; Tue, 17 Dec 2019 09:43:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 95B7820716 for ; Tue, 17 Dec 2019 09:43:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726959AbfLQJnH (ORCPT ); Tue, 17 Dec 2019 04:43:07 -0500 Received: from 8bytes.org ([81.169.241.247]:57632 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725870AbfLQJnG (ORCPT ); Tue, 17 Dec 2019 04:43:06 -0500 Received: by theia.8bytes.org (Postfix, from userid 1000) id 921C4286; Tue, 17 Dec 2019 10:43:05 +0100 (CET) Date: Tue, 17 Dec 2019 10:43:04 +0100 From: Joerg Roedel To: Cong Wang Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Robin Murphy Subject: Re: [Patch v2 0/3] iommu: reduce spinlock contention on fast path Message-ID: <20191217094304.GF8689@8bytes.org> References: <20191129004855.18506-1-xiyou.wangcong@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191129004855.18506-1-xiyou.wangcong@gmail.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 28, 2019 at 04:48:52PM -0800, Cong Wang wrote: > This patchset contains three small optimizations for the global spinlock > contention in IOVA cache. Our memcache perf test shows this reduced its > p999 latency down by 45% on AMD when IOMMU is enabled. Sounds nice. Can you please re-send with Robin Murphy on Cc? Robin, can you have a look at these IOVA changes please? Thanks, Joerg