I/O Scheduling results in poor responsiveness

[Nathan Grennan]

Pasi Kärkkäinen wrote:
>
> What motherboard/chipset do you have? which sata chipset? 
>
>   
ASUS P5B Premium

ICH8R in ACHI mode

> Are you using ncq?
>   
Yes, I tried turning it off.
> Did you try limiting the memory to 2G or even 1G ? 
>
>   
No, I haven't tried that one, though had thought about it.
> Are you running 32bit or 64bit OS? 
>
>   
x86_64 across the board. I have thought of trying it on i686 systems, 
though the only ones I have running Fedora 8 are laptops.
>
> Did you also try noop?
>
>   
No, I thought about trying that.
>  
> Maybe also try iostat.. maybe it shows you something more/important in this
> case.
>   
I have looked it it, but not in detail.
> There are also some caching/flushing related vm parameters which might
> affect these things.. 
>   
That is what I meant by sys.vm settings, but after some reading this 
morning I might have been configuring them in the wrong direction. In 
this case less may be more.