On Tue, 2010-09-21 at 16:50 -0700, Andrew Morton wrote:
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.
No us, he's using a binary driver.
Dave.