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=-0.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 F1BE7C43603 for ; Wed, 18 Dec 2019 04:33:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B698621582 for ; Wed, 18 Dec 2019 04:33:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="OwsxUf3j" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726690AbfLREdB (ORCPT ); Tue, 17 Dec 2019 23:33:01 -0500 Received: from mail-pj1-f49.google.com ([209.85.216.49]:52115 "EHLO mail-pj1-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726518AbfLREdB (ORCPT ); Tue, 17 Dec 2019 23:33:01 -0500 Received: by mail-pj1-f49.google.com with SMTP id j11so272355pjs.1 for ; Tue, 17 Dec 2019 20:33:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=RhWhhJRvas1fX646WnNBdCig25ysHcJ+tN6mdIOPt0s=; b=OwsxUf3j+WHDhf/lx/mcXYPECFgQNqJTOKGWSgjWY92F0l4lmrMfeClfU/8Moo+7rT BluGEDiqFgK5LbhLtSryyUErnSCuycEbGYFTT20x70BzHYbf41GRWCSRTprG7Lrso8PW wS49W4quNIgP1iHyjsN3NaaH6W/ZMcwTLXVEgRPMN4dBkHwn9sgrLAmjmuee0kPAt600 uAKLwFSzfNoOAk5Da4IjRM2D6oFapj8EzSxX0+KcnWfhRvMWJh3/+y5Szc9H90OGaZPW kE2WN29zBE/5mFMuKeVbGj3NfDHBjZivrNj0g/FY4COFvtXC/r4UqsEZGsR8kb+cPDBp yWog== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=RhWhhJRvas1fX646WnNBdCig25ysHcJ+tN6mdIOPt0s=; b=GP1o5bOTPC9v9os4GFn6ghPvLWE3QgS9hiDwJqN5nqueFXBVzIQB4sR8DN7sew3HcG TBZSmfYVatPTpjcyngym0395me9Rj/21wRCKExQMFTXxOkQPTMsFhE0bu5fG8OQhsxPU KtoXa9w6d0TgjSBsxT5V69geJMjeCYjZd/PGYovkvnIqtz3GOLXM+tw/RI0BGKTui3ID pWz31UPBop2Qe3LD5S7fFchwSa+yghg1KoSpWhCy6haWxP0lxWNTqW+0uWN/+CsLxbM4 wAVmQVe2Av5syBQ/TmEAp0HoNj19Z62q4dD8bg+ZW9wrp6O/nMBjUI350iK2DnLUGhy6 1hlg== X-Gm-Message-State: APjAAAU3XhKmrJ/xt/vL79XCk91vJX2AbBdleQnVezqhGPcMneucJuQJ DANblgaHIqnZzkr1i+Y5X4FXqprnhTfIXA6ttAfXneTNljs= X-Google-Smtp-Source: APXvYqw8lz68SMylW0jxDOP6eWVeHHMSeZzt8gFyiu11XP1sXj1jCm2+RD4n/3QfpBnn58DskFF3h88vSdbt8VM7GJI= X-Received: by 2002:a17:902:34d:: with SMTP id 71mr439589pld.316.1576643580541; Tue, 17 Dec 2019 20:33:00 -0800 (PST) MIME-Version: 1.0 References: <20191129004855.18506-1-xiyou.wangcong@gmail.com> <20191217094304.GF8689@8bytes.org> In-Reply-To: <20191217094304.GF8689@8bytes.org> From: Cong Wang Date: Tue, 17 Dec 2019 20:32:49 -0800 Message-ID: Subject: Re: [Patch v2 0/3] iommu: reduce spinlock contention on fast path To: Joerg Roedel Cc: iommu@lists.linux-foundation.org, LKML , Robin Murphy Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 17, 2019 at 1:43 AM Joerg Roedel wrote: > > 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? I will resend V3 with Robin Cc'ed. Thanks. 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Wed, 18 Dec 2019 04:33:01 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lhZdUhwP9Xqb for ; Wed, 18 Dec 2019 04:33:01 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mail-pj1-f41.google.com (mail-pj1-f41.google.com [209.85.216.41]) by silver.osuosl.org (Postfix) with ESMTPS id 19A1A2050C for ; Wed, 18 Dec 2019 04:33:01 +0000 (UTC) Received: by mail-pj1-f41.google.com with SMTP id s94so744467pjc.1 for ; Tue, 17 Dec 2019 20:33:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=RhWhhJRvas1fX646WnNBdCig25ysHcJ+tN6mdIOPt0s=; b=OwsxUf3j+WHDhf/lx/mcXYPECFgQNqJTOKGWSgjWY92F0l4lmrMfeClfU/8Moo+7rT BluGEDiqFgK5LbhLtSryyUErnSCuycEbGYFTT20x70BzHYbf41GRWCSRTprG7Lrso8PW wS49W4quNIgP1iHyjsN3NaaH6W/ZMcwTLXVEgRPMN4dBkHwn9sgrLAmjmuee0kPAt600 uAKLwFSzfNoOAk5Da4IjRM2D6oFapj8EzSxX0+KcnWfhRvMWJh3/+y5Szc9H90OGaZPW kE2WN29zBE/5mFMuKeVbGj3NfDHBjZivrNj0g/FY4COFvtXC/r4UqsEZGsR8kb+cPDBp yWog== X-Google-DKIM-Signature: v=1; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Tue, Dec 17, 2019 at 1:43 AM Joerg Roedel wrote: > > 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? I will resend V3 with Robin Cc'ed. Thanks. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu