[ILUG] Elevators... no, it is on topic!

[John Mc Donald]

I have no idea what it means, but could it refer to some kind of elevator
scheduling
algorithm. This type of algorithm is commonly used in scheduling disk request
whereby the disk head simply scans from the outer cylinder of the disk to the
inner
cylinder of the disk repetitively. In fact the algorithm is also referred to as
the SCAN
algorithm. Disk requests are then processed as the head passes over the relevant
cylinder.....and yes this is a complete guess ;-) But it is coming from a block
device
so its worth a shot.

John.

Liam Bedford wrote:

> Anyone come across this kernel message?
>
> Mar 15 18:20:01 doozer kernel: __elevator_merge: req latency 4042 req latency
> 4035
>
> I'm running 2.3.49 with devfs, and that message is from
> drivers/block/ll_rw_blk.c, if it helps...
>
> I'm just curious, it's appearing every so often...
>
> (I wasn't aware of having an elevator in my machine anyway!)
> L.
> ---
> Liam Bedford
> WBT
>
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--
==================================
John Mc Donald,
Dept. of Computer Science,
National University of Ireland,
Maynooth,
Co. Kildare,
Ireland.

Email : johnmcd at cs.may.ie
Phone : +353 -1 - 7084589
Fax : +353 -1 - 7083848
http://www.cs.may.ie/~johnmcd
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