From owner-freebsd-x11@FreeBSD.ORG  Mon Dec  2 03:20:02 2013
Return-Path: <owner-freebsd-x11@FreeBSD.ORG>
Delivered-To: freebsd-x11@smarthost.ysv.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 D9E2A8F8
 for <freebsd-x11@smarthost.ysv.freebsd.org>;
 Mon,  2 Dec 2013 03:20:02 +0000 (UTC)
Received: from freefall.freebsd.org (freefall.freebsd.org
 [IPv6:2001:1900:2254:206c::16:87])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (No client certificate requested)
 by mx1.freebsd.org (Postfix) with ESMTPS id C64F56CB6
 for <freebsd-x11@smarthost.ysv.freebsd.org>;
 Mon,  2 Dec 2013 03:20:02 +0000 (UTC)
Received: from freefall.freebsd.org (localhost [127.0.0.1])
 by freefall.freebsd.org (8.14.7/8.14.7) with ESMTP id rB23K2Dj082934
 for <freebsd-x11@freefall.freebsd.org>; Mon, 2 Dec 2013 03:20:02 GMT
 (envelope-from gnats@freefall.freebsd.org)
Received: (from gnats@localhost)
 by freefall.freebsd.org (8.14.7/8.14.7/Submit) id rB23K2sm082933;
 Mon, 2 Dec 2013 03:20:02 GMT (envelope-from gnats)
Date: Mon, 2 Dec 2013 03:20:02 GMT
Message-Id: <201312020320.rB23K2sm082933@freefall.freebsd.org>
To: freebsd-x11@FreeBSD.org
Cc: 
From: Callum Gibson <callumgibson@optusnet.com.au>
Subject: Re: ports/183435: x11/xorg: 100% CPU use of xorg using firefox when
 showing large images (say 20 Mpixel)
X-BeenThere: freebsd-x11@freebsd.org
X-Mailman-Version: 2.1.16
Precedence: list
Reply-To: Callum Gibson <callumgibson@optusnet.com.au>
List-Id: X11 on FreeBSD -- maintaining and support <freebsd-x11.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-x11>,
 <mailto:freebsd-x11-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-x11/>
List-Post: <mailto:freebsd-x11@freebsd.org>
List-Help: <mailto:freebsd-x11-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-x11>,
 <mailto:freebsd-x11-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 02 Dec 2013 03:20:02 -0000

The following reply was made to PR ports/183435; it has been noted by GNATS.

From: Callum Gibson <callumgibson@optusnet.com.au>
To: bug-followup@FreeBSD.org, w-info2@xs4all.nl
Cc:  
Subject: Re: ports/183435: x11/xorg: 100% CPU use of xorg using firefox when
 showing large images (say 20 Mpixel)
Date: Mon, 2 Dec 2013 14:17:42 +1100

 You might find this is related to pixmap caching. I don't think it's
 video driver specific.  Ironically the variable to disable this is called:
 MOZ_DISABLE_IMAGE_OPTIMIZE
 
 https://wiki.mozilla.org/Mobile/MemoryReduction#Disable_X_image_caching_on_Unix.2FLinux
 
 Maybe at some time in the past with smaller images and slower networks
 it hurt performace, but now displaying large, modern images in firefox causes
 it to stuff an enormous pixmap into the X server which is used once, and
 eats all the CPU whilst firefox is just hanging there waiting for it to finish.
 Setting this variable fixes it for me.
 
     C
 
 -- 
 
 Callum Gibson @ home