kernel IO schedulers

[Net Llama!]

On 12/31/2004 10:34 AM, Jerry McBride wrote:
>  On Thursday 30 December 2004 14:58, Net Llama! wrote:
>  > I could be wrong, but I think that in 2.6.10 there's a choice of several
>  > different schedulers in the kernel:
>  >
>  > # IO Schedulers
>  > #
>  > CONFIG_IOSCHED_NOOP=y
>  > CONFIG_IOSCHED_AS=y
>  > CONFIG_IOSCHED_DEADLINE=y
>  > CONFIG_IOSCHED_CFQ=y
>  >
>  > What I'm wondering is what happens if you chose Y for all of them (as
>  > above)?
>  >
>  > The reason I'm asking is that I did choose Y for all of them, and now in
>  > 2.6.10 (but not in earlier kernels) i'm getting some horrific
>  > performance in X (XFCE specifically).  Scrolling in windows is sluggish,
>  > sometimes even typing gets lagged.  I'm starting to think that I was
>  > supposed to choose just one of the schedulers, but I'd like some input.
> 
> Clicking yes, makes them available in the kernel. At boot time, make your 
> scheduler choice as a kernel parameter like:
> 
>  elevator= [IOSCHED]
>    Format: {"as"|"cfq"|"deadline"|"noop"}
>    See Documentation/block/as-iosched.txt
>    and Documentation/block/deadline-iosched.txt for details.
> 
> The default scheduler is deadline.

OK, thanks.  So i'm using the anticipatory scheduler, which is what I 
thought i was using for previous 2.6.x kernels.  However, performance is 
very noticably not the same (nor as good) as it was for previous 2.6.x 
kernels.

What is everyone else using right now?


-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
L. Friedman                       	       netllama at linux-sxs.org
Linux Step-by-step & TyGeMo: 		    http://netllama.ipfox.com

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