Re: anticipatory scheduler merged

[Brandon Low]

On Sat, 07/05/03 at 13:33:34 -0700, Andrew Morton wrote:
> - These changes have been well tested, but it is five months work and
>   over 100 patches.  There's probably a bug or two.  If you suspect that
>   something has gone wrong at the block layer (lots of tasks stuck in D
>   state) then please retest with `elevator=deadline'.
> 
> Thanks.

I am seeing these D tasks when running 2.5.74-mm2 under a heavy seeking
load (compiling application, untarring kernel, and filesharing
simultaneously) on a slow (laptop 4200RPM) hdd.  I find that after about
10 uptime when I start throwing on the seeking loads one or all of them
go to D state and any new disk IO is either blocked or very slow.

I have tested with elevator=deadline and have been unable to reproduce.

Any further testing or debugging you need me to do I can probably do
(but I'm not terribly knowledgable so I'll need step by step for said
testing).  Thanks!

Brandon Low