Re: Evaluation of three I/O schedulers

From: Nick Piggin (
Date: Tue Jul 01 2003 - 01:12:51 EST

Peter Wong wrote:

>We used 2.5.72+mm1 to evaluate three I/O schedulers, namely
>anticipatory, deadline and complete fair queueing under a very heavy
>database workload on an 8-way Pentium 4 machine. The workload is a
>decision support system doing mostly sequential I/O and each run takes
>about one hour. All three runs finished completely without encountering
>functional problems, and achieved similar performance level.
>The 8-way machine has Pentium 4 2.0 GHz processors, 16 GB physical
>memory, 2MB L3 cache, 8 FC controllers with 80 disks. Hyperthreading
>was turned on for the three runs. The CPU utilization is similar for all
>three runs: 65% user, 7% system and 28% idle.

Hi Peter,
How many block devices are being used at once in your tests?
I would be interested to see profiles of AS and DL if possible.


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