[Bug 303945] Re: [intrepid] firefox uses 100% cpu when editing wikipedia/mediawiki pages

[gavinmc]

I've just been repeating the problem.  It's not difficult on my laptop
(a dell latitude d410).

gavinmc at bambi:~$ lspci
00:00.0 Host bridge: Intel Corporation Mobile 915GM/PM/GMS/910GML Express Processor to DRAM Controller (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 1 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #3 (rev 03)
00:1d.3 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #4 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB2 EHCI Controller (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev d3)
00:1e.2 Multimedia audio controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Audio Controller (rev 03)
00:1e.3 Modem: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Modem Controller (rev 03)
00:1f.0 ISA bridge: Intel Corporation 82801FBM (ICH6M) LPC Interface Bridge (rev 03)
00:1f.1 IDE interface: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) IDE Controller (rev 03)
01:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5751 Gigabit Ethernet PCI Express (rev 01)
02:01.0 CardBus bridge: Texas Instruments PCI6515 Cardbus Controller
02:01.5 Communication controller: Texas Instruments PCI6515 SmartCard Controller
02:03.0 Network controller: Intel Corporation PRO/Wireless 2200BG [Calexico2] Network Connection (rev 05)

It turns out that it happens with launchpad too, if I stay on an edit
page too long.  Attached is a graph plotting the cpu usage of the
firefox process when I just leave it on the edit page.  As it began to
dip, I switched to the firefox window and it began to climb again.

The plot is from the output of column 3 of "ps aux".  top said it was at
99% cpu.  Not sure what the difference is

Gavin



** Attachment added: "firefoxcpu.png"
   http://launchpadlibrarian.net/20108012/firefoxcpu.png

-- 
[intrepid] firefox uses 100% cpu when editing wikipedia/mediawiki pages
https://bugs.launchpad.net/bugs/303945
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