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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 B94E5C10F13 for ; Thu, 11 Apr 2019 14:10:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 944D42077C for ; Thu, 11 Apr 2019 14:10:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726670AbfDKOKc (ORCPT ); Thu, 11 Apr 2019 10:10:32 -0400 Received: from foss.arm.com ([217.140.101.70]:43816 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726121AbfDKOKc (ORCPT ); Thu, 11 Apr 2019 10:10:32 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D422980D; Thu, 11 Apr 2019 07:10:31 -0700 (PDT) Received: from [10.37.12.69] (unknown [10.37.12.69]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 4690D3F68F; Thu, 11 Apr 2019 07:10:30 -0700 (PDT) Subject: Re: [RFC PATCH] arm64/fpsimd: Don't disable softirq when touching FPSIMD/SVE state To: Dave Martin Cc: linux-arm-kernel@lists.infradead.org, bigeasy@linutronix.de, linux-rt-users@vger.kernel.org, catalin.marinas@arm.com, will.deacon@arm.com, ard.biesheuvel@linaro.org, linux-kernel@vger.kernel.org References: <20190208165513.8435-1-julien.grall@arm.com> <20190404105233.GD3567@e103592.cambridge.arm.com> From: Julien Grall Message-ID: <0f8d6b53-6834-7363-03fc-6fd47ea49b80@arm.com> Date: Thu, 11 Apr 2019 15:10:28 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190404105233.GD3567@e103592.cambridge.arm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Dave, On 4/4/19 11:52 AM, Dave Martin wrote: > On Fri, Feb 08, 2019 at 04:55:13PM +0000, Julien Grall wrote: > I'm not sure how this patch will affect context switch overhead, so it > would be good to see hackbench numbers (or similar). I finally have some numbers for this patch. The benchmark was ran using Linux 5.1-rc4 and defconfig. On Juno2: * hackbench 100 process 1000 (10 times) * .7% quicker On ThunderX 2: * hackbench 1000 process 1000 (20 times) * 3.4% quicker I am happy to try other benchmark if you think it is useful. Anyway, I will resend the series with the comments addressed. Cheers, -- Julien Grall