Re: [gentoo-amd64] [gentoo-amd64 Gentoo Linux Tuning Guide

[Fernando Boaglio]

Guys,

After a kernel rebuild my machine was pretty fast! =D

My new config:

 cat /usr/src/linux/.config | grep -i cpu
# CONFIG_GENERIC_CPU is not set
CONFIG_X86_CPUID=y
CONFIG_SPLIT_PTLOCK_CPUS=4
# CPU Frequency scaling
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_TABLE=y
# CONFIG_CPU_FREQ_DEBUG is not set
CONFIG_CPU_FREQ_STAT=y
# CONFIG_CPU_FREQ_STAT_DETAILS is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
# CONFIG_CPU_FREQ_GOV_POWERSAVE is not set
# CONFIG_CPU_FREQ_GOV_USERSPACE is not set
# CONFIG_CPU_FREQ_GOV_ONDEMAND is not set
# CONFIG_CPU_FREQ_GOV_CONSERVATIVE is not set
# CPUFreq processor drivers
# CONFIG_X86_ACPI_CPUFREQ is not set
# CONFIG_X86_ACPI_CPUFREQ_PROC_INTF is not set

Since I'm running a desktop machine, not a laptop, I removed all non
related options.

Chris, no problem with my DMA:

>hdparm /dev/hda
/dev/hda:
 multcount    = 16 (on)
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    = 256 (on)
 geometry     = 65535/16/63, sectors = 156250000, start = 0

Thanks for all tips everybody!


On 4/27/06, Chris Wall <chris.wall@××××××××.com> wrote:
> Fernando Boaglio wrote:
>
> >Hmm...
> >
> >Please check my kernel config file:
> >
> >
> >
> >>cat /usr/src/linux/.config | grep -i cpu
> >>
> >>
> ># CONFIG_GENERIC_CPU is not set
> >CONFIG_X86_CPUID=y
> >CONFIG_SPLIT_PTLOCK_CPUS=4
> ># CPU Frequency scaling
> >CONFIG_CPU_FREQ=y
> >CONFIG_CPU_FREQ_TABLE=y
> ># CONFIG_CPU_FREQ_DEBUG is not set
> >CONFIG_CPU_FREQ_STAT=y
> ># CONFIG_CPU_FREQ_STAT_DETAILS is not set
> >CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
> ># CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
> >CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
> >CONFIG_CPU_FREQ_GOV_POWERSAVE=y
> >CONFIG_CPU_FREQ_GOV_USERSPACE=y
> >CONFIG_CPU_FREQ_GOV_ONDEMAND=y
> >CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y
> ># CPUFreq processor drivers
> ># CONFIG_X86_ACPI_CPUFREQ is not set
> ># CONFIG_X86_ACPI_CPUFREQ_PROC_INTF is not set
> >
> >Should I change anything ?
> >
> >Maybe  I should remove CONFIG_CPU_FREQ_GOV_CONSERVATIVE and
> >CONFIG_CPU_FREQ_GOV_POWERSAVE...
> >
> >=)
> >
> >On 4/27/06, Sergio Polini <sp_rm_it@×××××.it> wrote:
> >
> >
> >>Fernando Boaglio:
> >>
> >>
> >>>It's not about startup time, it's about running time, sometimes the
> >>>systems freezes
> >>>a little bit, just like asking for more CPU or RAM.
> >>>
> >>>
> >>I'ld look at the cpu frequency governor.
> >>From /usr/src/linux/drivers/cpufreq/Kconfig, about the 'conservative'
> >>governor:
> >>
> >>"If you have a desktop machine then you should really be considering
> >>the 'ondemand' governor instead, however if you are using a laptop,
> >>PDA or even an AMD64 based computer (due to the unacceptable
> >>step-by-step latency issues between the minimum and maximum frequency
> >>transitions in the CPU) you will probably want to use this governor."
> >>
> >>As far as I can understand, this means that AMD64 takes "a lot" of
> >>time to switch between two frequencies, so "the system freezes a
> >>little bit" when this happens.
> >>
> >>This is why I've choosen the conservative governor for my HP dv5000
> >>laptop.
> >>
> >>My 2 cents ;-)
> >>
> >>Sergio
> >>
> >>--
> >>gentoo-amd64@g.o mailing list
> >>
> >>
> >>
> >>
> >
> >
> >--
> >[]'s
> >boaglio@×××××.com
> >
> >
> >
> Also, check your hard drive parameters and make sure DMA is on.  I
> always get tripped up by this between an Intel 2.53 machine and my AMD64
> 3200+ machine.  It seems that everytime I rebuild the kernel on the
> AMD64 I forget to set the correct values for DMA access.
> Chris
> --
> gentoo-amd64@g.o mailing list
>
>



--
[]'s
boaglio@×××××.com

-- 
gentoo-amd64@g.o mailing list