Re: 2.6.x Scheduler, preemption and responsiveness - puzzlement

[Sid Boyce]

Con Kolivas wrote:

> Sid Boyce writes:
>
> > Nuno Monteiro wrote:
> >
> > > On 2004.07.11 23:55, Sid Boyce wrote:
> > >
> > > > I've been wondering why this is, I can't remember what the BIOS 
> > > > says  about the hard drives, from memory it looked OK, I think it 
> > > > was set to
> > >
> > >
> > >
> > > <snip snip>
> > >
> > > > PCI           IDE              nVidia Corporation nForce2 IDE (rev a2)
> > >
> > >
> > >
> > > <snip snip>
> > >
> > > > # CONFIG_BLK_DEV_AMD74XX is not set
> > >
> > >
> > >
> > > You don't have the driver for your IDE chipset compiled in. In the 
> > > "ATA/ ATAPI/MFM/RLL support" under "Device Drivers" menu select "AMD 
> > > and nVidia  IDE support". Also, you can disable the "Generic PCI IDE 
> > > Chipset Support"  and the "VIA82CXXX chipset support" you seem to 
> > > have enabled.
> > >
> > > Then you should be able to do DMA, and things will go a lot faster.
> > >
> > >
> > > Hope this helps.
> > >
> > >
> > >
> > >         Nuno
> >
> >
> > Oops!, thanks. The previous motherboard used the VIA chipset, so that 
> > got missed when I changed over.
> > Regards
> > Sid.
>
>
> DMA disabled is perhaps the most common reason for poor performance 
> under I/O loads. I think some cut down configurations that people have 
> used from their 2.4 installations have missed the appropriate IDE driver.
>
> Cheers,
> Con

That fixed the problem. When I checked my P-II 333 box and AMD64 laptop 
(VIA chipset), they were OK. Working on 4 boxes at the same time, I 
guess I got stuck in a VIA mental groove.
Regards
Sid.

--
Sid Boyce .... Hamradio G3VBV and keen Flyer
===== LINUX ONLY USED HERE =====

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