periodic iowait spike

From: Toralf FÃrster
Date: Sun May 03 2015 - 06:02:21 EST

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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

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Toralf
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Next message: Geert Uytterhoeven: "Re: [linux-sunxi] [PATCH 2/3] spidev: Add DT binding example."
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