diskio low read performance

[Kris Kennaway]

On Sat, Jan 13, 2007 at 04:58:06PM -0200, Michel Santos wrote:

> I have two server, the main server is a Supermicro Dualcore Dual Opteron
> and the backup is a Athlon64 X2, both with 4GB
> 
> The disks are the same, only the onboard SCSI is Adaptec and the other is
> LSI. Funny is that I have no difference regarding the disk read
> performance wether I use the Opteron machine or the other
> 
> dmesg Opteron
> http://suporte.lucenet.com.br/ms/dmesg.sm
> 
> dmesg X2
> http://suporte.lucenet.com.br/ms/dmesg.x2
> 
> kernel config
> http://suporte.lucenet.com.br/ms/kernel62

options        SCHED_ULE               # ULE scheduler

From the NOTES file from where you copied this:

# SCHED_ULE is a new scheduler that has been designed for SMP and has some
# advantages for UP as well.  It is intended to replace the 4BSD scheduler
# over time.  NOTE: SCHED_ULE is currently considered experimental and is
# not recommended for production use at this time.

When investigating problems with your system, your very first step
should be to revert the use of code marked "experimental" and "not
recommended for production use" ;-)

Kris
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