Re: adaptive readahead overheads

[Andi Kleen]

Voluspa <lista1@xxxxxxxxx> writes:

> On Thu, 8 Jun 2006 19:37:31 +0800 Fengguang Wu wrote:
> > I'd like to show some numbers on the pure software overheads come with
> > the adaptive readahead in daily operations.
> [...]
> > 
> > # time find /usr -type f -exec md5sum {} \; >/dev/null
> > 
> > ARA
> > 
> > 406.00s user 325.16s system 97% cpu 12:28.17 total
> 
> Just out of interest, all your figures show an almost maxed out CPU.

It might be because qemu has a poor IO model (old IDE) that is quite 
CPU intensive to drive.

-Andi
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