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    SubjectRe: regression in 2.6.35.4 'load is to heavy (video subsystem?)'
    On Mon, 30 Aug 2010 10:02:36 +0200
    Karsten Mehrhoff <kawime@gmx.de> wrote:

    > Using the same .config from 2.6.35.3 to compile 2.5.36.4 results in a
    > heavy load with 2.6.35.4.

    A regression within -stable is rather bad.

    > Example:
    >
    > Difference between 2.6.35.1/2/3 and 2.6.35.4 while watching some videos:
    > 2.6.35.4 switches the cpu for flash videos in the browser (opera or
    > iceweasel) or other video outputs to 2200/2400/2600 MHz meanwhile 2.6.35.3
    > (or older) stays at 1000 Mhz. That results in a higher cpu temperature,
    > more power consumption and so one.
    >
    > Using other GUI program results in nearly the same problems with 2.6.35.4,
    > so this kernel is unusable for me.
    >
    > Results to see the difference for the same action
    > 2.6.35.4
    > Core0 Temp: +45.0__C
    > Core1 Temp: +43.0__C
    > cpu MHz: 2200.000 or higher
    >
    > 2.6.35.3
    > Core0 Temp: +32.0__C
    > Core1 Temp: +31.0__C
    > cpu MHz: 1000.000 (max. 1800, but falling back to 1000)
    >
    > kernel compiled with 'CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y'
    > results for me in 1000, 1800, 2000, 2200, 2400, 2600 MHz.
    >
    > I'm not the only one with this problem, other users experienced the same
    > behavior on other systems on 386 systems, i.e. a regression for glxgears
    > about 30% on slower systems. We all uses differnet AMD cpus and nNida
    > graphic controllers. Same results for the nvidia-kernel from the repos or
    > the nVidia driver from nvidia.com.
    >
    > There must something be wrong in the video subsystem, which is causing
    > this regression.
    >
    > My system (overview using 2.5.35.3):
    > =====================
    > Processor: 2x AMD Athlon(tm) 64 X2 Dual Core Processor 5000+
    > Memory: 4060MB
    >
    > Display
    > Resolution: 1920x1080 pixels
    > OpenGL Renderer: GeForce 9500 GT/PCI/SSE2
    > X11 Vendor: The X.Org Foundation
    > Version: 1.7.7
    >
    > Version
    > Kernel: Linux 2.6.35.3-kmt (x86_64)
    > Compiled: SMP Mon Aug 23 00:58:37 CEST 2010
    > C Library: GNU C Library version 2.11.2 (stable)
    > Default C Compiler: GNU C Compiler version 4.4.5 20100824 (prerelease)
    > (Debian 4.4.4-11)
    > Distribution: Debian GNU/Linux squeeze/sid
    >
    > OpenGL
    > Vendor: NVIDIA Corporation
    > Renderer: GeForce 9500 GT/PCI/SSE2
    > Version: 3.3.0 NVIDIA 256.44
    > Direct Rendering: Yes

    I'm not seeing any relevant cpufreq changes in 2.6.35.3 -> 2.6.35.4
    (ftp://ftp.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.35.4). There
    were a lot of DRM changes.




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