From owner-svn-src-all@FreeBSD.ORG Thu Aug 15 21:35:31 2013 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id 1C9F26E3; Thu, 15 Aug 2013 21:35:31 +0000 (UTC) (envelope-from ivoras@gmail.com) Received: from mail-vb0-x232.google.com (mail-vb0-x232.google.com [IPv6:2607:f8b0:400c:c02::232]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 92AA32B32; Thu, 15 Aug 2013 21:35:30 +0000 (UTC) Received: by mail-vb0-f50.google.com with SMTP id x14so1093683vbb.9 for ; Thu, 15 Aug 2013 14:35:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=85ng4UucbrYoflogl3fXgkSCcUqDmXMYqr5uOKssY5I=; b=rTSfA2IPHfIVkXEUc/OsxrVo6eoi9F+3itIlVZBBgNu+3yoj5NyVrIydne6k6nNWfO A6iD2mw9zs5OBfmOHz5lIjfipCcXUp93Ju/0LlGhm7Jy9IShjIDA8m1ZslhcBiKGuFs+ gWynpsfRF0RkhkAZkIrd8YbJlFaxg62iMpuivnvXeeKrwgLCOcOpu+/rrlv1cx9EKDxP oBM26qKSgxWh9le1tGb2O11Gc/Wyyu0hUNnB6b0y5t7CLHGlrX+aGDEvItvsHuTRUoxV cwSzllyaQDflKAZT24p1hVfqhwn6eeLMAtf7PEYJu2lCLV833TMJkST9hgDOZRymAfZT OssQ== X-Received: by 10.58.106.82 with SMTP id gs18mr14829541veb.18.1376602529213; Thu, 15 Aug 2013 14:35:29 -0700 (PDT) MIME-Version: 1.0 Sender: ivoras@gmail.com Received: by 10.58.229.167 with HTTP; Thu, 15 Aug 2013 14:34:49 -0700 (PDT) In-Reply-To: <520D3AD8.4090207@freebsd.org> References: <201308152019.r7FKJI0H095440@svn.freebsd.org> <520D3AD8.4090207@freebsd.org> From: Ivan Voras Date: Thu, 15 Aug 2013 23:34:49 +0200 X-Google-Sender-Auth: EsQcFbJbQNab15Ezxf0OfazzodU Message-ID: Subject: Re: svn commit: r254380 - in head/sys: kern sys To: Colin Percival Content-Type: text/plain; charset=UTF-8 Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Aug 2013 21:35:31 -0000 On 15 August 2013 22:32, Colin Percival wrote: > No, I wasn't aware that it existed. Given that this change applies only to > parallel operations *on the same vnode* and blogbench seems to have traffic > randomly spread between many files, I doubt there would be any difference. Maybe it could help a bit on the directories? Whatever the problem may be (does FreeBSD still have single-writer + multiple readers lock for processes accessing the same vnode?), there is a huge difference in performance with blogbench between FreeBSD and Linux.