linux-kernel - periodic iowait spike

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Message-ID: <5545F220.1060902@gmx.de>
Date:	Sun, 03 May 2015 12:02:08 +0200
From:	Toralf Förster <toralf.foerster@....de>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: periodic iowait spike

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

-- 
Toralf
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