Re: Disk schedulers

[Jeffrey E. Hundstad]

Lukas Hejtmanek,

I have to say, that I've heard this subject before, the summary answer 
seems to be, that the kernel can not guess the wishes of the user 100% 
of the time.  If you have a low priority I/O task use ionice(1) to set 
the priority of that task so it doesn't nuke your high priority task.

I have to personal stake in this answer but I can report that for my 
high I/O tasks it does work like a charm.

--
Jeffrey Hundstad

Lukas Hejtmanek wrote:
> On Fri, Feb 15, 2008 at 03:42:58PM +0100, Jan Engelhardt wrote:
>   
> > Also consider
> > - DMA (e.g. only UDMA2 selected)
> > - aging disk
> >     
>
> it's not the case.
>
> hdparm reports udma5 is used, if it is reliable with libata.
>
> The disk is 3 months old, kernel does not report any errors. And it has never
> been different.
>
> --
> Lukáš Hejtmánek
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