From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 B92C14CDF9 for ; Tue, 26 Dec 2023 09:05:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="VmPjQx43" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1703581511; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Ve1uqTx9MMoZ3Gc+pAWDljbgIT4AroaD+W2YAl66BV4=; b=VmPjQx43ZrErVM0YKAbfGJJwuuad09J27D+ugiQcCPbBLGD2lVirOMegGFg4CZjobX4vbE 39FSjzR8+SQqG95B3GbeyE/AOffnMSkRIgfOFzX0Wg4k5ylB6sNey/o4+M4VgFm7eQ0UMW EIuI2VOzmqiIkdEmMHc8Sf6HvP8dupc= Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-265-wgmJgcOGO4-KozNJ0jitvw-1; Tue, 26 Dec 2023 04:05:10 -0500 X-MC-Unique: wgmJgcOGO4-KozNJ0jitvw-1 Received: by mail-wr1-f72.google.com with SMTP id ffacd0b85a97d-3367b16449bso2789372f8f.3 for ; Tue, 26 Dec 2023 01:05:09 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1703581509; x=1704186309; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=Ve1uqTx9MMoZ3Gc+pAWDljbgIT4AroaD+W2YAl66BV4=; b=Ya1nxQJzyH/admtpC00zKuM/bJyyvy4Ug5Wyfpf7m0aeAybVJjUeSLPeJH1gHzJQM5 leUivx/U97yyjCzY5OoQULlcgPsZcx5m+NVWTMqldcip/auEFKG/NhddO9R3PT8B6+aa /BBwfE3LeJZDG1vVOcRv8VxTfv1NlqQwhmz93mFy5ie1v4nR05QlznxYFTQWVsa8gndm sisRJl8XQNN0Sn10x1lN6s1IDTPTLJ8pbQfrrOSy8uSOn0qLK7yekiHkEZKVKx6Y14Yc wZfXoMsXnva7q4G3ifcpJ8bLdBDjvh+XS7H6zvbiILrV3olMJSsecvPopECoR46rEf0a exWQ== X-Gm-Message-State: AOJu0Ywuo9KJGQlHYPO/6adSeL1OFQOpKvuS66CckuwXh4WPecu/ApNE ZkwO1kmMW5STBeN7Q7s9WQXz4T0a92L7yxx/5bfYyJziLLcTjcVFek6VsDfJLgODgoiYZUvx9ec 89HlwA4hINrKhehq2BhUJP5NqnITpy0Bn X-Received: by 2002:a5d:4590:0:b0:336:6895:f5fb with SMTP id p16-20020a5d4590000000b003366895f5fbmr3586469wrq.75.1703581509056; Tue, 26 Dec 2023 01:05:09 -0800 (PST) X-Google-Smtp-Source: AGHT+IHLiMWpmfAgwDwhbbW5uVJ8j6cbfhcNo+n6TStySwWGpppm3cK94RSMZ4VKjncgbKZYFbBFBA== X-Received: by 2002:a5d:4590:0:b0:336:6895:f5fb with SMTP id p16-20020a5d4590000000b003366895f5fbmr3586459wrq.75.1703581508742; Tue, 26 Dec 2023 01:05:08 -0800 (PST) Received: from redhat.com ([2.55.177.189]) by smtp.gmail.com with ESMTPSA id df15-20020a5d5b8f000000b00336c43b366fsm3580935wrb.12.2023.12.26.01.05.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 Dec 2023 01:05:08 -0800 (PST) Date: Tue, 26 Dec 2023 04:05:04 -0500 From: "Michael S. Tsirkin" To: Li Feng Cc: Jens Axboe , Jason Wang , Paolo Bonzini , Stefan Hajnoczi , Xuan Zhuo , "open list:BLOCK LAYER" , linux-kernel , "open list:VIRTIO BLOCK AND SCSI DRIVERS" Subject: Re: [PATCH] virtio_blk: set the default scheduler to none Message-ID: <20231226040342-mutt-send-email-mst@kernel.org> References: <20231207043118.118158-1-fengli@smartx.com> <20231225092010-mutt-send-email-mst@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Dec 26, 2023 at 05:01:40PM +0800, Li Feng wrote: > Hi MST and paolo, > > mq-deadline is good for slow media, and none is good for high-speed media. > It depends on how the community views this issue. When virtio-blk adopts > multi-queue,it automatically changes from deadline to none, which is not > uniform here. It's not virtio-blk changing though, it's linux doing that, right? Is virtio-blk special somehow? > I don't have ideas right now to answer Christoph/Paolo's question. > > Thanks, > Li -- MST