From owner-freebsd-hackers@FreeBSD.ORG  Mon Feb 25 01:18:57 2013
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115])
 by hub.freebsd.org (Postfix) with ESMTP id 469CDFA6;
 Mon, 25 Feb 2013 01:18:57 +0000 (UTC)
 (envelope-from adrian.chadd@gmail.com)
Received: from mail-wi0-f180.google.com (mail-wi0-f180.google.com
 [209.85.212.180])
 by mx1.freebsd.org (Postfix) with ESMTP id 8C67323D;
 Mon, 25 Feb 2013 01:18:56 +0000 (UTC)
Received: by mail-wi0-f180.google.com with SMTP id hi8so2609003wib.13
 for <multiple recipients>; Sun, 24 Feb 2013 17:18:49 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:x-received:sender:in-reply-to:references:date
 :x-google-sender-auth:message-id:subject:from:to:cc:content-type;
 bh=jj5pFUEuQcqQZoqdDb/eSAox1Y7fg5ISE8bVtG3pmsA=;
 b=iZQWRo62s/6hTaOM9n4rPu3c2KkBSqpKgCmnHFxk3SW1Fdh5PppUIYGF0unZdz6ED8
 ZFVdj7SoM2cJtZ5DBsKxo0QkmkC6iZqzxXZsVGpbxCtMatopGIFSXZZMIos8jTtQ6EH/
 Idvr+xXGC97Pgj67wikKOMsj0NdPcIXi7t1VEilLm4ik0QKcS84MzpBOWGPbaZtqd8wl
 WCzjNj3WCNokFFl6Nxlx8yBT5JmAtaCr9f41OV2P/p+D5i9rPurf54V8X12ToiBMYRrc
 uYsIqW7c15Yjl3D1kt6+9U687agqwzKZ1TkAcTQD82hOvFBB+9RPcp46y8kVEmlJqUim
 sAtQ==
MIME-Version: 1.0
X-Received: by 10.180.24.229 with SMTP id x5mr8994657wif.17.1361755129242;
 Sun, 24 Feb 2013 17:18:49 -0800 (PST)
Sender: adrian.chadd@gmail.com
Received: by 10.216.74.194 with HTTP; Sun, 24 Feb 2013 17:18:49 -0800 (PST)
In-Reply-To: <5129F54D.9040503@mail.ru>
References: <511F879C.3030801@mail.ru> <51217854.8000508@freebsd.org>
 <5123D941.2050906@mail.ru> <51293505.1030706@freebsd.org>
 <5129F54D.9040503@mail.ru>
Date: Sun, 24 Feb 2013 17:18:49 -0800
X-Google-Sender-Auth: W84RScLeNXm_wf4ZY0ya-eC2oXQ
Message-ID: <CAJ-Vmo=r+F4=ig+ZduEutEsr1EbudZMcRLvZUZ3cp8JVvXJJVg@mail.gmail.com>
Subject: Re: Scrolling in framebuffer syscons
From: Adrian Chadd <adrian@freebsd.org>
To: Phileas Fogg <phileas-fogg@mail.ru>
Content-Type: text/plain; charset=ISO-8859-1
Cc: Oleksandr Tymoshenko <gonzo@freebsd.org>, freebsd-hackers@freebsd.org
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
 <freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-hackers>, 
 <mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
 <mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 25 Feb 2013 01:18:57 -0000

On 24 February 2013 03:11, Phileas Fogg <phileas-fogg@mail.ru> wrote:
> Julian Elischer wrote:
>
>>
>> not sure if it's relevent, but remember that updating the screen mor ethan
>> 50
>> times a second is pointless.
>> I'm not sure if the curent video console does it but having the final copy
>> only
>> done on 50Hz ticks can save a lot of copying.
>>
>
> Right, but then you have to handle VSYNC hardware interrupts and copy
> framebuffer data from system memory to video memory.

Which you likely should do anyway, right? if you're going to be doing
any kind of large-scale screen updating.



Adrian




Adrian