This is a fun little quirk.........
2.2.5 had significantly greater IO performance and this attachment is
roughly what changed between 2.2.5 and 2.2.10 or so........
This change has been demonstrated to clobber direct Block-IO with a 50-60%
penality............just a thought.........
On 20 Mar 2000, Dimitris Michailidis wrote:
> Ever since the early 2.3.4x kernels performance under moderate to heavy disk
> I/O has dropped, possibly due to the elevator. 2.3.40 is substantially
> faster than recent versions, by as much as 40%. I have generated some kernel
> profiles under disk I/O load that are available from
> ftp://oss.sgi.com/pub/profiles/. For these particular runs 2.3.40 was 25%
> faster than 2.3.99-pre2. Notice the increase in the number of IRQs from the
> disk controller (~250%) and the increase in scheduling activity (~400%), a
> good deal of which is due to __get_request_wait.
>
> --
> Dimitris Michailidis dimitris@engr.sgi.com
>
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>
Andre Hedrick
The Linux ATA/IDE guy
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