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daniel4230877
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Joined: 25 Jul 2013
Posts: 31

PostPosted: Tue Sep 10, 2013 4:54 pm    Post subject: Slow Performance after updating kernel Reply with quote

After updating from kernel 3.2 to kernel 3.11 (I update my kernel very rarely), I am getting noticably slower performance when running processor demanding applications. For example, I used to get 60 FPS on dolphin-emu, a Nintendo Gamecube Emulator, and now I get 40 or so. I used to get 60 FPS with Desmume, a Nintendo DS emulator as well. When running them, my computer doesn't get as hot as it did on the previous kernel though, so I'm guessing that when I configured the kernel I configured an option to save power or something? Does that even exist?
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PaulBredbury
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Joined: 14 Jul 2005
Posts: 7310

PostPosted: Tue Sep 10, 2013 5:20 pm    Post subject: Re: Slow Performance after updating kernel Reply with quote

daniel4230877 wrote:
option to save power

Maybe ASPM - check for kernel option:
Code:
$ zgrep ASPM /proc/config.gz | grep =
CONFIG_PCIEASPM=y
CONFIG_PCIEASPM_PERFORMANCE=y
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Logicien
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Joined: 16 Sep 2005
Posts: 743
Location: Montréal

PostPosted: Tue Sep 10, 2013 5:39 pm    Post subject: Reply with quote

Updating the kernel might mean updating the firmwares to versions the new kernel need to work proprely. For example, a Linux source from the testing branch (~) can need the linux-firmware of the testing branch too, not the stable version.

So, accorging to the kernel log, are you sure that your graphic and other drivers did'nt complain about missing firmwares and versions?
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azieba
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Joined: 09 Sep 2013
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PostPosted: Tue Sep 10, 2013 5:40 pm    Post subject: Reply with quote

Maybe something with Frequency scaling. Check for :

Code:
CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
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daniel4230877
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Joined: 25 Jul 2013
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PostPosted: Thu Sep 12, 2013 12:42 am    Post subject: Reply with quote

azieba wrote:
Maybe something with Frequency scaling. Check for :

Code:
CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set


The issue was that I did not have the performance governor set. After changing that and recompiling the kernel, the issue was fixed. Thanks :)
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