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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C60D7C433F5 for ; Fri, 8 Oct 2021 08:05:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A919961037 for ; Fri, 8 Oct 2021 08:05:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233506AbhJHIG5 (ORCPT ); Fri, 8 Oct 2021 04:06:57 -0400 Received: from frasgout.his.huawei.com ([185.176.79.56]:3944 "EHLO frasgout.his.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233427AbhJHIGy (ORCPT ); Fri, 8 Oct 2021 04:06:54 -0400 Received: from fraeml735-chm.china.huawei.com (unknown [172.18.147.207]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4HQgdX0ChLz67vnQ; Fri, 8 Oct 2021 16:02:08 +0800 (CST) Received: from lhreml724-chm.china.huawei.com (10.201.108.75) by fraeml735-chm.china.huawei.com (10.206.15.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.8; Fri, 8 Oct 2021 10:04:55 +0200 Received: from [10.47.80.141] (10.47.80.141) by lhreml724-chm.china.huawei.com (10.201.108.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.8; Fri, 8 Oct 2021 09:04:54 +0100 Subject: Re: [PATCH v5 00/14] blk-mq: Reduce static requests memory footprint for shared sbitmap To: Bart Van Assche , Kashyap Desai , Jens Axboe CC: , , , , , Jan Kara References: <1633429419-228500-1-git-send-email-john.garry@huawei.com> <81d9e019-b730-221e-a8c0-f72a8422a2ec@huawei.com> <597c4cbe-ca6c-53e5-1139-be2ca0fbb677@acm.org> From: John Garry Message-ID: <0da031cb-427b-abd8-368d-d242e8c844c8@huawei.com> Date: Fri, 8 Oct 2021 09:07:25 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.1 MIME-Version: 1.0 In-Reply-To: <597c4cbe-ca6c-53e5-1139-be2ca0fbb677@acm.org> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.47.80.141] X-ClientProxiedBy: lhreml744-chm.china.huawei.com (10.201.108.194) To lhreml724-chm.china.huawei.com (10.201.108.75) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/10/2021 04:11, Bart Van Assche wrote: + > On 10/7/21 13:31, Kashyap Desai wrote: >> I tested this patchset on 5.15-rc4 (master) - >> https://github.com/torvalds/linux.git >> >> #1 I noticed some performance regression @mq-deadline scheduler which >> is not >> related to this series. I will bisect and get more detail about this >> issue >> separately. > > Please test this patch series on top of Jens' for-next branch > (git://git.kernel.dk/linux-block). The mq-deadline performance on Jens' > for-next branch should match that of kernel v5.13. Kashyap did also mention earlier that he say the drop from v5.11 -> v5.12. The only thing I saw possibly related there was Jan's work in https://lore.kernel.org/linux-block/20210111164717.21937-1-jack@suse.cz/ to fix a performance regression witnessed on megaraid sas for slower media. But I quite doubtful that this is the issue. Thanks, John