From owner-freebsd-arm@FreeBSD.ORG Sun Jan 4 11:53:01 2015 Return-Path: Delivered-To: freebsd-arm@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 81D815B3 for ; Sun, 4 Jan 2015 11:53:01 +0000 (UTC) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 68A8A394F for ; Sun, 4 Jan 2015 11:53:01 +0000 (UTC) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.14.9/8.14.9) with ESMTP id t04Br1kx016344 for ; Sun, 4 Jan 2015 11:53:01 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-arm@FreeBSD.org Subject: [Bug 194635] Speed optimisation for framebuffer console driver on Raspberry Pi Date: Sun, 04 Jan 2015 11:53:00 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: arm X-Bugzilla-Version: 10.0-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: stefan.berndt@imoriath.com X-Bugzilla-Status: Open X-Bugzilla-Priority: Normal X-Bugzilla-Assigned-To: freebsd-arm@FreeBSD.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Jan 2015 11:53:01 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194635 --- Comment #9 from Stefan Berndt --- It's no surprice one 32bit operation is faster than four 8bit operations, since computers having data bus systems wider than 8bit. Even the ~35 years old 8086 already has a 16bit wide data bus... I have got the 11.0-CURRENT on my raspberry, and made the speedtest again. (time taken to print and sroll 1 milion lines at 1440x900 in VT mode) 16 Bit per Pixel: 918 Secends 24 Bit per Pixel: 1133 Secends 32 Bit per Pixel: 903 Secends It seems there is some space for optimisations. I will show at the vt code in near future. -- You are receiving this mail because: You are the assignee for the bug.