User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:2.0b12pre) Gecko/20110204 Firefox/4.0b12pre Build Identifier: Mozilla/5.0 (X11; Linux x86_64; rv:2.0b12pre) Gecko/20110204 Firefox/4.0b12pre problems exists for both firefox 3.6.13 (Fedora 14 x86_64 distribution version) and firefox-4.0b12pre.en-US.linux-x86_64 build: 20110202162900 With only one Firefox window with the single tab with the URL: http://www.bbc.co.uk/news/world-middle-east-12340082 The desktop in general, and Firefox in particular becomes extremely unresponsive for well over a minute! I have tried this several times, and each time the system becomes painfully slow in the extreme. Processor utilisation of 2 out of 4 cores goes up to the equivalent of 100% utilization of one core - top tells me that xorg is running at 99.4%. This may be an xorg problem, but because it only appears to happens when I run Firefox with the URL, I'm raising the bug here. Other people may have the same problem and automatically blame Firefox. Anyhow, mozilla should be aware of it. I will also raise a bug on xorg as requested by Boris Zbarsky see Comment 4 of Bug 591821. Same problem persists in safe mode with all add-ons disabled using: firefox-4.0b12pre.en-US.linux-x86_64 build: 20110202162900 Reproducible: Always Steps to Reproduce: 1.enter http://www.bbc.co.uk/news/world-middle-east-12340082 2.hit enter 3.wait... Actual Results: system becomes painfully slow in the extreme for well over a minute Expected Results: System should still be responsive and should take less than a minute to render or at least not cause such high processor utilisation. $ uname -a Linux saturn 2.6.35.10-74.fc14.x86_64 #1 SMP Thu Dec 23 16:04:50 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux up to date Fedora 14 install AMD 810 quad core 64 bit 8 GB DDR3 RAM 5 * 500GB in software RAID-6 configuration ASUS M4A78T-E motherboard Bus 001 Device 004: ID 046d:0990 Logitech, Inc. QuickCam Pro 9000

see also: https://bugzilla.redhat.com/show_bug.cgi?id=675326

Are you by chance using the xorg-x11-drv-ati video driver? If so, it looks like Fedora 14 is still on version 6.13.1 http://koji.fedoraproject.org/koji/packageinfo?packageID=95 Version 6.13.2 vastly improves the very slow RepeatNone scaling with KMS. Unfortunately it looks difficult to try the Fedora 15 packages on a Fedora 14 system.

Linux neptune 2.6.34.7-66.fc13.x86_64 #1 SMP Wed Dec 15 07:04:30 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux Fully patched Fedora 14 1.5GB RAM AMD Sempron(tm) Processor 3000+ single 64 bit core firefox-4.0b12pre.en-US.linux-x86_64 build: 20110202162900 Same problems with unresponsiveness and overloaded processor

Sorry, the last comment should have said Fedora 13

What video driver is X using? (I expect xorg-x11-drv-ati 6.13.0 would have the same issue if using kms.) I see sluggish scrolling here, but not like described in comment 0.

on saturn the quad core AMD with Fedora 14: 01:05.0 VGA compatible controller: ATI Technologies Inc Radeon HD 3300 Graphics on neptune the single core AMD Sempron wirh Fedora 13: from /var/log/Xorg.0.log [ 38.611] (--) NOUVEAU(0): Chipset: "NVIDIA NV4a" I will investigate xorg-x11-drv-ati later - we are about to have visitors for dinner, so it might be 3 or more hours before I can report back... Not sure how to check the video driver

Thanks. Interesting that nouveau has the same issue. xorg-x11-drv-ati reports as "radon" in Xorg.0.log.

"radeon", that is.

on saturn the quad core AMD with Fedora 14: [ 23.460] (II) LoadModule: "radeon" [ 23.460] (II) Loading /usr/lib64/xorg/modules/drivers/radeon_drv.so [ 23.460] (II) Module radeon: vendor="X.Org Foundation" [ 23.460] compiled for 1.8.99.906, module version = 6.13.99 [ 23.460] Module class: X.Org Video Driver [ 23.460] ABI class: X.Org Video Driver, version 8.0

Maybe the version is reported as 6.13.99 because they didn't expect to do a 6.13.2 release. For 6.13.2, the version was changed from 6.13.99 to 6.13.2. http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/commit/?id=cc5005af61f45a3552f7358dc5aa711e42f5af54 I checked the source of http://koji.fedoraproject.org/koji/buildinfo?buildID=192343 and it doesn't have the fix for the issue in comment 2. (i.e. http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/commit/?id=f8fb9312d791af1f77020e8c2d35bb30841ed9aa) FWIW, I expect fixing bug 600390 would vastly improve this for both radeon and nouveau drivers.

Curious, yum reports version as '6.13.1' rather than as '6.13.99'! # yum info xorg-x11-drv-ati Loaded plugins: auto-update-debuginfo, langpacks, presto, refresh-packagekit Adding en_GB to language list Found 154 installed debuginfo package(s) Enabling rpmfusion-free-updates-debuginfo: RPM Fusion for Fedora 14 - Free - Updates Debug Enabling rpmfusion-nonfree-updates-debuginfo: RPM Fusion for Fedora 14 - Nonfree - Updates Debug Enabling rpmfusion-free-debuginfo: RPM Fusion for Fedora 14 - Free - Debug Installed Packages Name : xorg-x11-drv-ati Arch : x86_64 Version : 6.13.1 Release : 0.3.20100705git37b348059.fc14 Size : 1.1 M Repo : installed From repo : anaconda-InstallationRepo-201010211827.x86_64 Summary : Xorg X11 ati video driver URL : http://www.x.org License : MIT Description : X.Org X11 ati video driver.

I expect this is resolved by http://hg.mozilla.org/mozilla-central/rev/4b8d96e463fd

Setting resolution to Verified Fixed on Mozilla/5.0 (Windows NT 6.1; rv:6.0) Gecko/20100101 Firefox/6.0b3