Mailinglist Archive: opensuse (3175 mails)

[Jon Nelson <jnelson-suse@xxxxxxxxxxx>]

On Wed, 4 Apr 2007, Bill Anderson wrote:

> I noticed that the default elevator applies to everything, including USB
> memory sticks. I thought the block device driver would change the I/O
> scheduler to something more appropriate for a memory stick, such as the noop
> scheduler. I switched to the noop scheduler for just the memory stick, and
> there was an improvement in performance. I haven't done a detailed statistical
> analysis to verify my empirical impression.
> 
> I have a few questions:
> 1) Is there a reason for the block device driver not changing the I/O
> scheduler to noop?
> 2) How do I modify HAL to change the I/O scheduler when it detects that a
> hotplug for a memory stick?

I can't answer (1), and (2) is probably pretty easy.
However, let me offer an alternative:

set the *default* I/O scheduler (there /are/ several schedulers, you 
know) to noop and then at boot time re-set your HDD (or whatever local 
devices you want to change back) to "anticipatory" (or whatever you 
use).


--
Carpe diem - Seize the day.
Carp in denim - There's a fish in my pants!

Jon Nelson <jnelson-suse@xxxxxxxxxxx>
-- 
To unsubscribe, e-mail: opensuse+unsubscribe@xxxxxxxxxxxx
For additional commands, e-mail: opensuse+help@xxxxxxxxxxxx