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 X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 51EE8C54FCF for ; Mon, 23 Mar 2020 23:09:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2946E206C3 for ; Mon, 23 Mar 2020 23:09:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="TEBFfXqZ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725990AbgCWXJ0 (ORCPT ); Mon, 23 Mar 2020 19:09:26 -0400 Received: from mail-pl1-f195.google.com ([209.85.214.195]:33323 "EHLO mail-pl1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725897AbgCWXJ0 (ORCPT ); Mon, 23 Mar 2020 19:09:26 -0400 Received: by mail-pl1-f195.google.com with SMTP id g18so6598887plq.0 for ; Mon, 23 Mar 2020 16:09:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding:content-language; bh=srDYPq1sl5XiMrVTRNik2lXd48dAxRC5F99gwAgQsHo=; b=TEBFfXqZEMVAhTNH1rt7KDfVJOmBeB4x1ad9Sr9wUA2OJU8VdPPHOo7NyMQGJF8n3H ++fInsswuB8sYGavE7diMFgQLvKFXPgFqbd3msrORoFlkPSJXtCrQ5LU2HG7x1G6bg3A oZ3kwVg/WukNP+TvlYf8IxocWp7AlIIrto74UjojiJz4kjNR0N/v86lnnQd5FnOmeC5N WTpAfK7dIrwLJPrtujYM4ajAvtp+m20xhyx71z0O4toKPw+7Lq/RUcmw5IrJbNomxaPR 8ilrpXiherwiUO0P+2QjFVlRGRKQmaY+G2KNUPT21Tatj+bKCCZimBcFqgh2o9Q1mZxE Msjg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=srDYPq1sl5XiMrVTRNik2lXd48dAxRC5F99gwAgQsHo=; b=TB0XHNm7V+VhzvOlG/fITt1FhK1RhvCCGtyKNIxhL5UgfNkBMKsB2J2RgGGjtDzkFb ZiHpdOHs2/E3gBHl1+LVkXam9QhmOAumupPgyIOCrn9UwFFWTDkTWmmxiodt1FY7EdUL pR3lzKG/Y8xd/X5VRrYgXStYtPsIAnRfk00xN+o8baHCuNJNZCedb+XOlQDV1EFfAtCh s9/iIlwCzUnVnwwbNnXmjGwRyyye3aY6RDCXpLyJ9Tl0HY8jHph99mOgIAnEwm2VYpls 7vsWOgroa375fNePcw08KPFnFPMSZv0HzpcDpVt/2M8fIQRW6ohUQnucrutxaBL8gkZJ k1nw== X-Gm-Message-State: ANhLgQ3DJRtICY5SAZ3rdx8NYDaePXlJgWVE49lZ4E9m1Klm2MaTMRmN +q8UxsBVVXf6l6Y3E3QNIE8= X-Google-Smtp-Source: ADFU+vtkHFvDdi+1CkUE0NUli2ocUDUWy1xWVqb305t7gwIeyj1OklV/SX0dh8VC03ZIo3vgyC6Oig== X-Received: by 2002:a17:902:a407:: with SMTP id p7mr16673143plq.257.1585004963176; Mon, 23 Mar 2020 16:09:23 -0700 (PDT) Received: from ?IPv6:240b:10:2720:5510:a182:288:3ffa:432a? ([240b:10:2720:5510:a182:288:3ffa:432a]) by smtp.gmail.com with ESMTPSA id x66sm13800214pgb.9.2020.03.23.16.09.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 23 Mar 2020 16:09:22 -0700 (PDT) Subject: Re: [PATCH] block, nvme: Increase max segments parameter setting value To: Chaitanya Kulkarni , "linux-block@vger.kernel.org" Cc: "linux-nvme@lists.infradead.org" References: <20200323182324.3243-1-ikegami.t@gmail.com> From: Tokunori Ikegami Message-ID: Date: Tue, 24 Mar 2020 08:09:19 +0900 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Hi, > The change looks okay, but why do we need such a large data length ? > > Do you have a use-case or performance numbers ? We use the large data length to get log page by the NVMe admin command. In the past it was able to get with the same length but failed currently with it. So it seems that depended on the kernel version as caused by the version up. Also I have confirmed that currently failed with the length 0x10000000 256MB. Regards, Ikegami