Re: kernel performance

[Jan Willem Stumpel <jstumpel@planet.nl>]

Paras pradhan wrote:
> hi:
>
> i want to build a custom 2.6.x kernel for desktop systems. i
> have build kernel 2.6.12-3 successfully , but the performace of
> the kernel 2.4.27-1-386 ( from debian sid mirror ) is much
> better  than kernel 2.6.12-3 that i built from source. for ex:
> in kernel 2.4.27-1 if it takes 5 minutes to burn a CD, it will
> take around 20 minutes in my customized kernel.  Also running 2
> or more applications is very sppedy in 2.4.27-1 than my custom
> built kernel.
>
> what shouild i add in .config before building my 2.6.x keries
> so that the perfomance will be equal or better than 24.x series
> kernel.

You may not have DMA enabled. Check in menuconfig

  Device Drivers  --->
     ATA/ATAPI/MFM/RLL support  --->
         Generic PCI bus-master DMA support

And perhaps
	
         Use PCI DMA by default when available

Regards, Jan