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[209.132.180.67]) by mx.google.com with ESMTP id c2si20472680oig.255.2020.01.21.12.05.48; Tue, 21 Jan 2020 12:06:01 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@rubrik.com header.s=google header.b=Dl+0Mm4w; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=rubrik.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728205AbgAUUDf (ORCPT + 99 others); Tue, 21 Jan 2020 15:03:35 -0500 Received: from mail-pg1-f194.google.com ([209.85.215.194]:37414 "EHLO mail-pg1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727360AbgAUUDf (ORCPT ); Tue, 21 Jan 2020 15:03:35 -0500 Received: by mail-pg1-f194.google.com with SMTP id q127so2094230pga.4 for ; Tue, 21 Jan 2020 12:03:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rubrik.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=qfjJsIdbdeYfyoWYZI/v+xL9rsxmnFotagk/efJxZeQ=; b=Dl+0Mm4wp0jO8VhSxSjgZYlXNa7+CtoQ1TxEwHldbo8iKofTT/JBSl5vqLmaMvqLEv +yX/GmZ1nmJ2Nx1AVhCk57wU+/3+k0byzqUmrusAW2gGDJEDCb//X2bKpvmWIEg1vjaI pD1CeR2SOZq6cyjLENDYoQzuEhW+b0gbxr/rk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=qfjJsIdbdeYfyoWYZI/v+xL9rsxmnFotagk/efJxZeQ=; b=ZRCfCceV/PAXWuKdToNuXOa5Ztp8AqY8mvob3Dw4B66bBYN4L0WmiItToWJZTw28nk meqKLK+LmyEzjPbyOYBjvcqv+OB0a2VhyGlFqMrt2dBRyADMd890fASuFETwTS3KVO3A mbNL8yOjjA4cgJWDMNgzzo3dF9lXF8EjmE3EV2o5AJ3hvpgtNhXjMsNgcZsK9yZSoIbO tyja2Kg+wqyAzOEReJqWTRTaUF9Gel7A042E8FKiqNLWzEIgJoSggWYULSyQuwOOSWqN 6jl3r8/Nz3IYKQBl7uI90Fdts4GEClspJU7Wow7xXr9NlZp3I/hsRhxc7Wa6XtKfWHpL 3ANw== X-Gm-Message-State: APjAAAUNv7wyZiOXRg2SQWHnVlTRhp1ljPbkta52a+WfceE8/6m9cRnE buIFMbxzpbk1zXlChy+L9o+6 X-Received: by 2002:a63:904c:: with SMTP id a73mr7316944pge.335.1579637014774; Tue, 21 Jan 2020 12:03:34 -0800 (PST) Received: from fa2cb4acc48b.colo.rubrik.com ([4.7.92.14]) by smtp.gmail.com with ESMTPSA id w3sm40524754pgj.48.2020.01.21.12.03.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Jan 2020 12:03:34 -0800 (PST) From: "muraliraja.muniraju" Cc: Chaitanya.Kulkarni@wdc.com, "muraliraja.muniraju" , Jens Axboe , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] Adding multiple workers to the loop device. Date: Tue, 21 Jan 2020 20:03:21 +0000 Message-Id: <20200121200323.52287-1-muraliraja.muniraju@rubrik.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: To: unlisted-recipients:; (no To-header on input) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Below is the dd results that I ran with the worker and without the worker changes. Enhanced Loop has the changes and ran with 1,2,3,4 workers with 4 dds running on the same loop device. Normal Loop is 1 worker(the existing code) with 4 dd's running on the same loop device. Enhanced loop 1 - READ: io=21981MB, aggrb=187558KB/s, minb=187558KB/s, maxb=187558KB/s, mint=120008msec, maxt=120008msec 2 - READ: io=41109MB, aggrb=350785KB/s, minb=350785KB/s, maxb=350785KB/s, mint=120004msec, maxt=120004msec 3 - READ: io=45927MB, aggrb=391802KB/s, minb=391802KB/s, maxb=391802KB/s, mint=120033msec, maxt=120033msec 4 - READ: io=45771MB, aggrb=390543KB/s, minb=390543KB/s, maxb=390543KB/s, mint=120011msec, maxt=120011msec Normal loop 1 - READ: io=18432MB, aggrb=157201KB/s, minb=157201KB/s, maxb=157201KB/s, mint=120065msec, maxt=120065msec 2 - READ: io=18762MB, aggrb=160035KB/s, minb=160035KB/s, maxb=160035KB/s, mint=120050msec, maxt=120050msec 3 - READ: io=18174MB, aggrb=155058KB/s, minb=155058KB/s, maxb=155058KB/s, mint=120020msec, maxt=120020msec 4 - READ: io=20559MB, aggrb=175407KB/s, minb=175407KB/s, maxb=175407KB/s, mint=120020msec, maxt=120020msec The Enhanced loop is the current patch with number of workers to be 4. Beyond 4 workers I did not see a significant changes.