linux-kernel - Re: periodic iowait spike

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Message-ID: <55534871.1030004@gmx.de>
Date:	Wed, 13 May 2015 14:49:53 +0200
From:	Toralf Förster <toralf.foerster@....de>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: periodic iowait spike

On 05/03/2015 12:02 PM, Toralf Förster wrote:
> The picture in [1], created with isag from the sysstat package, shows a periodic spike in the iowait of my tinderbox server (hardened Gentoo 3.19.6-r1), correlating to write transactions per seconds from a similar graph.
> 
> I'm wondering what (kernel, btrfs or ?) is causing this.
> 
> 
> [1] http://www.zwiebeltoralf.de/pub/sar_cpu_3rdMay.png
> 
After I deleted from that 3 TB drive (1.2 TB were filled, 1.6 TB were free) about 0.5 TB, the spikes went away.
I'm wondering that such spikes happen although the drive had more than 50 % free space ...


-- 
Toralf
pgp key: 7B1A 07F4 EC82 0F90 D4C2  8936 872A E508 0076 E94E
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"; the past is all dirty and cruel in the modern popular imagination, with the exception of the Romans, who are just cruel"
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