From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from fanzine2.igalia.com (fanzine.igalia.com [178.60.130.6]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 325D214A088 for ; Sun, 22 Dec 2024 06:38:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=178.60.130.6 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734849502; cv=none; b=Qa08/0hYo+jwCbDy2idjOw554QfBKYcizAx4fGM6aMQP/EUo0EP/QBx1OmjHLbnPHWtEOJn/ci6+6Nqz74Pfba7khmeyeWC9cW9lI97L9eY3d2iqHw5Kt7tDwnmpTbRZRdF6pRvS+qLfWNHsGh0Ee0liu3VZG3abc44wlzN4DeQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734849502; c=relaxed/simple; bh=rEls8RzYLB/Tu9FwHX6cIlHR59hKu48fylPNXUfJA3I=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=PvMHKD8tsPKTs56nU7fx+H3OOmPijsCM1Xf69PomsTTjAbAWAUOXY3tWZVOPSp2vjNvF32p+E6+A4WA+bkUC6Ah6LrjMNcfBpIB/xFjiYbVPgQrLwr1jB70kP0d9CfsPPrPC4BCS8z+RgDSRFRM6d/ZTyNudkX7LGcR08cv6jCM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com; spf=pass smtp.mailfrom=igalia.com; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b=g6UMGj/S; arc=none smtp.client-ip=178.60.130.6 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=igalia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b="g6UMGj/S" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:From: References:Cc:To:Subject:MIME-Version:Date:Message-ID:Sender:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=rEls8RzYLB/Tu9FwHX6cIlHR59hKu48fylPNXUfJA3I=; b=g6UMGj/Sfl0WpOMf4DJh7mCxfV cH+/LSIIFrr//1OCrITETMNdwUdVi0+bd6ZV6QqS7yH8Fc2jjP5un4OFCxqebdVy4XWY/XD+0Co9L 19vbrMNtvvu2gvSZKG+xdgdCWCZz/EPiiP065p50lN0+V87t3URgnLDPRGQ1xzmiS7ysQZMt1Kydl wlwcK37l2xhfEhMCqC3EoMMEHdTtnpAqSbo4VlG1uNfvt9UmGpza0xkLxNcQUawV0UsebI56p6Vjp 5QxzToHqQe4lZUYBPSfhKUK5FPj/wuvEcCRJqsdMcqXQ8KjCejBSJVm2TLs9x+HkuiPuHmpjCHNYt DAjIkHpQ==; Received: from [58.29.143.236] (helo=[192.168.1.6]) by fanzine2.igalia.com with esmtpsa (Cipher TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_128_GCM:128) (Exim) id 1tPFbG-006PyO-8S; Sun, 22 Dec 2024 07:38:02 +0100 Message-ID: Date: Sun, 22 Dec 2024 15:37:55 +0900 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 0/6] sched_ext: Support high-performance monotonically non-decreasing clock To: Andrea Righi Cc: tj@kernel.org, void@manifault.com, mingo@redhat.com, peterz@infradead.org, kernel-dev@igalia.com, linux-kernel@vger.kernel.org References: <20241220062025.27724-1-changwoo@igalia.com> From: Changwoo Min Content-Language: en-US, ko-KR, en-US-large, ko In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Andrea, On 24. 12. 21. 07:29, Andrea Righi wrote: > I've tested this patch set and I haven't observed any significant > performance improvements (but also no regressions), even if the systems > I've tested are likely quite efficient at reading the hardware TSC. Thank you for the testing. I am glad to hear that there is no performance regression on an TSC-efficient system. > I'm curious if we'd see a more significant difference in non-hardware > virtualized systems (i.e., qemu without kvm). Have you done any testing in > such environments already? Well, I guess the gain is mostly relevant to how inefficient TSC is in the system and how much a workload stresses TSC. Regards, Changwoo Min