linux-kernel - Re: Weird disk idling

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Message-ID: <51A2BCE6.806@ahsoftware.de>
Date:	Mon, 27 May 2013 03:54:46 +0200
From:	Alexander Holler <holler@...oftware.de>
To:	Fredrik Tolf <fredrik@...da2000.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Weird disk idling

Am 26.05.2013 07:29, schrieb Fredrik Tolf:

> I'm sure you all know what the various fields are (except the first,

Hmm, I had to look at Documentation/block/stat.txt.

> which is just a timestamp), so as you can see, there are 135 requests in
> the queue, but no reads or writes happen, in this case, for at least 800
> ms.
> 
> Is this behavior normal and expected, or is there something wrong here?
> In the latter case, is it my hardware that is failing somehow, or can
> there be some software weirdness that can be tweaked away or bugfixed?

I would say thats how caches do work. You might have a look at

sysctl vm

which shows a lot of the knobs you can turn to change some of the
aspects you see.

Regards,

Alexander Holler
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