Re: 2.6.0 performance problems

[Martin Schlemmer <azarah@nosferatu.za.org>]

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On Tue, 2003-12-30 at 03:27, Dave Jones wrote:
> On Mon, Dec 29, 2003 at 07:17:23PM -0500, Thomas Molina wrote:
> 
>  > > >  UDMA modes: udma0 udma1 *udma2 udma3 udma4
>  > > >  AdvancedPM=yes: mode=0x80 (128) WriteCache=enabled
>  > > >  Drive conforms to: ATA/ATAPI-5 T13 1321D revision 1:
>  > > Any reason it is currently set to udma2 where it support udma4 ?
>  > 
>  > Not really.  The question was what mode the disk was running in.  This is 
>  > what it defaults to.  This is a laptop drive that only runs at 5400RPM.  
>  > Would changing the mode to udma4 make a dramatic difference?  
> 
> It's not uncommon for a laptop to have a hard disk which supports
> higher DMA modes than what the IDE chipset supports.
> My aging Intel 440BX based VAIO has a disk in the same configuration
> as yours, supports udma4, but chipset only goes up to udma2.
> 

Right, or as somebody else pointed out, it might not be a 80-pin cable.

Lets rephrase - does it also run in udma2 mode with 2.4 ?  And did
you check readahead?  In 2.6 it seems that a bigger value is better -
I for instance have to set it to 8192 to have the same performance as
in 2.4 ...


-- 
Martin Schlemmer

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