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List:       netbsd-tech-kern
Subject:    Re: RFC: patch to change the disk I/O scheduler via dkctl(8)
From:       Bill Studenmund <wrstuden () NetBSD ! org>
Date:       2005-09-29 21:26:44
Message-ID: 20050929212644.GC8221 () netbsd ! org
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On Thu, Sep 29, 2005 at 12:48:40PM -0700, Jason Thorpe wrote:
> 
> On Sep 29, 2005, at 11:40 AM, Bill Studenmund wrote:
> 
> >On Thu, Sep 29, 2005 at 07:32:51PM +0900, YAMAMOTO Takashi wrote:
> >>ftp://ftp.netbsd.org/pub/NetBSD/misc/xtraeme/bufq_on_the_fly.diff
> >>
> >>- is there any point to change "sortmethod" on the fly?
> >>  it's characteristics of the device.
> >
> >I thought the answer to your question would be that we have  
> >different sort
> >methods which are better for different workloads, so that changing  
> >on the
> >fly would make sense if the workload shifts (or if powerup code  
> >needs to
> >set up the right scheduler).
> 
> Queueing method, sure... but the "sort" (cylinder or raw block #) is  
> really something the device needs to decide.

Ahh. Thank you.

The one reason I could see for changing it would be if the administrator 
felt the device chose incorrectly. Not sure if it's appropriate to do...

Take care,

Bill

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