Comment 95 for bug 217580

top-idle.log

2009/5/2 Stefano Doni <email address hidden>

> Here's some hard performance data.
>
> I've measured Xorg and firefox CPU consumption in two scenarios:
>
> 1) System completely idle
> 2) Firefox open on gmail, only 1 tab, no firefox extensions, scrolling down
> this launchpad thread fully expaned with mouse wheel.
>
> In both cases I've recorded CPU utilization, 10 top recordings every 5
> seconds each of the two processes. Command line:
>
> top -b -n 10 -d 5 -p $(pidof firefox),$(pidof X)
>
> I'm attaching the two top logs. Two noteworthy things to point out:
>
> 1) CPU fully saturated (constantly 100%) when scrolling in gmail!
> 2) Process responsible for this is Xorg!
>
> See the attached logs. One important thing: I'm using nouveau now in
> Jaunty. Later I'll redo the recordings with nv and possibily NVIDIA closed
> drivers. I don't think it is a matter of driver though, I've opened this
> slowness bug when I was using Intrepid with nv and the situation was the
> same.
>
> Now, next step could be to profile the driver and see where the time is
> spent. Anyone willing to dive into this with me? I'm willing to profile this
> workload, if someone can guide me.
>
> 2009/5/1 phinn <email address hidden>
>
> Because it's not entirely an Nvidia bug either. My IBM T60 laptop draws
>> Firefox pages perfectly smooth with crappy ATI X1400 card compared to my
>> high end PC, its ridiculous. However, If you try Opera or Webkit based
>> browsers in Linux this problem does not occur. It is only between
>> Firefox + Nvidia.
>>
>> Yea, there should be some kind of bug report filled with Nvidia for sure
>> though. As both Firefox and them are to blame.
>>
>> --
>> Slow performance with Gmail
>> https://bugs.launchpad.net/bugs/217580
>> You received this bug notification because you are a direct subscriber
>> of the bug.
>>
>> Status in XUL + XPCOM application runner: Confirmed
>> Status in “firefox-3.0” source package in Ubuntu: Invalid
>> Status in “xulrunner-1.9” source package in Ubuntu: Fix Committed
>>
>> Bug description:
>> Binary package hint: firefox-3.0
>>
>> When scrolling in Gmail (and other websites however its not as noticable)
>> the scrolling performance is terrible. There is a slight lag from when it
>> starts to scroll to when it actually does scroll. On my Windows XP machine
>> it is MUCH faster (basically instant). This is present with both Compiz
>> enabled and disabled.
>>
>> ProblemType: Bug
>> Architecture: i386
>> Date: Tue Apr 15 01:01:46 2008
>> DistroRelease: Ubuntu 8.04
>> NonfreeKernelModules: nvidia
>> Package: firefox-3.0 3.0~b5+nobinonly-0ubuntu1
>> PackageArchitecture: i386
>> ProcEnviron:
>>
>> PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
>> LANG=en_US.UTF-8
>> SHELL=/bin/bash
>> SourcePackage: firefox-3.0
>> Uname: Linux 2.6.24-16-generic i686
>>
>
>