Re: [gentoo-user] Performance problem at writing big files and Multitasking

[Daniel Pielmeier]

> The hdparm optimizations, the CFQ scheduler and maybe low latency
> desktop in the kernel are the best way to make your desktop useable
> under heavy disk usage.These are my hdparm settings:
>
> /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     = 26310/16/63, sectors = 26520480, start = 0
>
> cat /sys/block/hda/queue/scheduler
> noop [cfq]
>
> Linux c-68-85-77-239 2.6.20-gentoo #4 PREEMPT Tue Feb 6 17:03:56 EST
> 2007 i686 AMD Athlon(tm) XP 2000+ AuthenticAMD GNU/Linux

Now  i am in front of my PC. I already use the cfq scheduler and have
low latency desktop enabled. I looked at the output of hdparm -I
/dev/sda and all seems to be ok by default.

> And check you have HZ set to 1000.
>
> $ grep HZ /usr/src/linux/.config
> # CONFIG_HZ_100 is not set
> # CONFIG_HZ_250 is not set
> CONFIG_HZ_1000=y
> CONFIG_HZ=1000

Thanks i will check if this helps, i have just set 250 HZ for timer
frequency.

> Could your problem be similar to this:
>
>    http://marc.theaimsgroup.com/?l=gentoo-user&m=114252338111258&w=2
>
>
> Tom

Maybe, today the gentoo-sources-2.6.19-r5 become stable so i will try
the new kernel. I am also waiting for kernel 2.6.20 as it has a setting
for the core 2 duo in processor settings. Maybe i try the testing
version of it.
Also the new gcc compilers will support the core 2 duo directly, but i
think it will take some time till 4.2 or even 4.3 will become stable.

I show up here again and tell you if something improves the performance
of my system.

Regards

Daniel
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