From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f178.google.com (mail-pl1-f178.google.com [209.85.214.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0A0AB4401 for ; Thu, 28 Dec 2023 07:23:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=smartx.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=smartx.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=smartx-com.20230601.gappssmtp.com header.i=@smartx-com.20230601.gappssmtp.com header.b="lJQK0Fmp" Received: by mail-pl1-f178.google.com with SMTP id d9443c01a7336-1d43df785c2so9662395ad.1 for ; Wed, 27 Dec 2023 23:23:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=smartx-com.20230601.gappssmtp.com; s=20230601; t=1703748230; x=1704353030; darn=vger.kernel.org; h=to:references:message-id:content-transfer-encoding:cc:date :in-reply-to:from:subject:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=5TS3IlhabUMeMhlcESxYLb6eSGYrLYo3Ig5rpjdUNeg=; b=lJQK0FmpkI8IBwp7sozilAKZY6DXtsPivugsxbL7VXlZSGJK+vtTorKMVMOUYqvGiH X38kRqOYMKZCAStleVnlAR2EV8st3Zh29pBgVOpnc3JI96Ex9MgQ9FKLNWk9etPRg5sf bQhh4m4rpiAh1NMs/YvghXiM+Ug/ffBH8zJV+sIufHxXlJXpBoheeH8ZuQVNDLV9Wxxe 7Mo2hkhDSAQL/YRhB6Xxk4zFVXYLizyAvtACLHNgruUa0eSpQ8QCE2SSW/5XXu9UDHcw o2VQA5ptEaxirBZ+7WuNc58h5gC+WydZTFuyvil5hz8i+RCSdGrLgB0fJ8RlWbAC0rHm Cz0g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1703748230; x=1704353030; h=to:references:message-id:content-transfer-encoding:cc:date :in-reply-to:from:subject:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=5TS3IlhabUMeMhlcESxYLb6eSGYrLYo3Ig5rpjdUNeg=; b=YzUl67d0xnPDVYef4snAwyLs+TPJ+QpD+WdF5Mbc2a6DzVKU0TBSmkb2+K/zN/1OoR ZEQqG9kBL2h+uxU4+n69HKZhwVGKeC5B0Qu4GyDh2TcKoB8kbbVhRUWmm3mf197yOGvl KBaEs+ICxNgek0jDRSWU+kbdcalvQ7xREmvEIPnBpDUG4re7eK2PlavSwGhj0fpwiVlV N1yXTD1TaTRSmshdL4NhIe3bNVDI4CkE0CHDe1p8NR/fuimth6bYfbFjQJ6DlgCJxDwa qQMlvx0YF1FZcLGklkt4m2U0+FeXBruJW6gHhyMB7/ElkwyqeubbzZc3iXOnUlMHMeEQ Jf6Q== X-Gm-Message-State: AOJu0Yyzl/x4xWToCANWwIIkD2y44ul3aPydsU+KA0UHZIRZpz5JAZWr Z7ZvN6wG3LWYebcdfko3c8d0xeWkKAQmng== X-Google-Smtp-Source: AGHT+IFyvLhzXFMJ5PbTZF/J8a62bVgxOg0ZB1uWE0WCuQw5a65QLBUpvBTSD0CYPdtp0b15f4cSuw== X-Received: by 2002:a17:902:c947:b0:1d4:3b8a:639a with SMTP id i7-20020a170902c94700b001d43b8a639amr2994233pla.124.1703748230281; Wed, 27 Dec 2023 23:23:50 -0800 (PST) Received: from smtpclient.apple ([8.210.91.195]) by smtp.gmail.com with ESMTPSA id s5-20020a170902ea0500b001d45f92c436sm6347479plg.5.2023.12.27.23.23.47 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 27 Dec 2023 23:23:49 -0800 (PST) Content-Type: text/plain; charset=us-ascii Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3774.100.2.1.4\)) Subject: Re: [PATCH] virtio_blk: set the default scheduler to none From: Li Feng In-Reply-To: <20231227050544-mutt-send-email-mst@kernel.org> Date: Thu, 28 Dec 2023 15:25:10 +0800 Cc: Paolo Bonzini , Jens Axboe , Jason Wang , Stefan Hajnoczi , Xuan Zhuo , "open list:BLOCK LAYER" , linux-kernel , "open list:VIRTIO BLOCK AND SCSI DRIVERS" Content-Transfer-Encoding: quoted-printable Message-Id: <9679B268-5BD7-4731-86CC-6B5CF7CE2DF2@smartx.com> References: <20231207043118.118158-1-fengli@smartx.com> <20231225092010-mutt-send-email-mst@kernel.org> <20231226103743-mutt-send-email-mst@kernel.org> <2E148FC5-F9A9-4A86-99F1-8D0B93412181@smartx.com> <20231227050544-mutt-send-email-mst@kernel.org> To: "Michael S. Tsirkin" X-Mailer: Apple Mail (2.3774.100.2.1.4) > On Dec 27, 2023, at 18:06, Michael S. Tsirkin wrote: >=20 > On Wed, Dec 27, 2023 at 03:26:30PM +0800, Li Feng wrote: >>=20 >>=20 >>> On Dec 26, 2023, at 23:38, Michael S. Tsirkin = wrote: >>>=20 >>> On Tue, Dec 26, 2023 at 05:01:40PM +0800, Li Feng wrote: >>>> I don't have ideas right now to answer Christoph/Paolo's question. >>>=20 >>> Paolo did some testing on this thread and posted some concerns. >>> Do you disagree with his analysis? >>=20 >> Paolo gave a very detailed data analysis. Indeed, in some low queue = depth >> scenarios, the data dropped somewhat. However, I suspect that it may = be=20 >> caused by other problems (such as test fluctuations) rather than the = benefits=20 >> brought by deadline. >=20 > Maybe. I think it would be up to you to prove this then. Ok. >=20 >=20 >> BTW, I think 128 queue depth test is a very important and common = performance >> test item for storage devices. >>=20 >> Thanks, >> Li >>=20 >>>=20 >>> --=20 >>> MST >>>=20 >=20