From owner-freebsd-bugs@FreeBSD.ORG  Wed Aug  6 20:38:33 2014
Return-Path: <owner-freebsd-bugs@FreeBSD.ORG>
Delivered-To: freebsd-bugs@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 493E19CC
 for <freebsd-bugs@FreeBSD.org>; Wed,  6 Aug 2014 20:38:33 +0000 (UTC)
Received: from kenobi.freebsd.org (kenobi.freebsd.org
 [IPv6:2001:1900:2254:206a::16:76])
 (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 31A022290
 for <freebsd-bugs@FreeBSD.org>; Wed,  6 Aug 2014 20:38:33 +0000 (UTC)
Received: from bugs.freebsd.org ([127.0.1.118])
 by kenobi.freebsd.org (8.14.8/8.14.8) with ESMTP id s76KcXLt063219
 for <freebsd-bugs@FreeBSD.org>; Wed, 6 Aug 2014 20:38:33 GMT
 (envelope-from bugzilla-noreply@freebsd.org)
From: bugzilla-noreply@freebsd.org
To: freebsd-bugs@FreeBSD.org
Subject: [Bug 192452] New: vt_vga very slow since r269471
Date: Wed, 06 Aug 2014 20:38:33 +0000
X-Bugzilla-Reason: AssignedTo
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: 11.0-CURRENT
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: Affects Many People
X-Bugzilla-Who: nwhitehorn@FreeBSD.org
X-Bugzilla-Status: Needs Triage
X-Bugzilla-Priority: ---
X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform
 op_sys bug_status bug_severity priority component assigned_to reporter
Message-ID: <bug-192452-8@https.bugs.freebsd.org/bugzilla/>
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-bugs@freebsd.org
X-Mailman-Version: 2.1.18
Precedence: list
List-Id: Bug reports <freebsd-bugs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-bugs>,
 <mailto:freebsd-bugs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-bugs/>
List-Post: <mailto:freebsd-bugs@freebsd.org>
List-Help: <mailto:freebsd-bugs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
 <mailto:freebsd-bugs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 06 Aug 2014 20:38:33 -0000

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192452

            Bug ID: 192452
           Summary: vt_vga very slow since r269471
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: nwhitehorn@FreeBSD.org

The VGA driver has become unusably slow since r269471. I suspect that the
support for non-8x8 fonts has dramatically increased the incidence of reads
from VGA memory. It might be best if the driver could be refactored to avoid
reads entirely, for example by passing some concept of write granularity up
from the driver into the vt core so that vd_bitbltchr() is called only for
operations of that width (redrawing partial characters).

-- 
You are receiving this mail because:
You are the assignee for the bug.