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DragonFly users List (threaded) for 2011-03
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Re: disk scheduler

From: Pierre Abbat <phma@xxxxxxxxxxxxx>
Date: Sun, 6 Mar 2011 14:34:57 -0500

On Sunday 06 March 2011 13:28:09 Alex Hornung wrote:
> FQ is a fair-queuing policy, primarily designed to balance the I/O
> between different processes taking into account the average latency of
> each request and the number of requests. It additionally avoids read
> starvation by giving higher priority to reads whenever they are
> available. It essentially should improve interactivity when I/O
> intensive (write intensive in particular) processes are running, like
> hammer rebalance, etc.

Sounds good. I've set it to fq. Looking at the code, I saw a note about 
reading something that has been scheduled to be written but hasn't been 
written yet. Does that work right?


Don't buy a French car in Holland. It may be a citroen.

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