100% CPU IOwait

[Caires Vinicius]

Hi guys!

We've started to use Varnish 4 with Amazon Linux with EBS SSD of 40GB,
memory of 7.5GB. We use the file storage with 20G allocated with ttl of 11
minutes and grace of 5 hours, all the other configs are standard.

Sometimes when we have a lot of request that result into cache miss we
started to notice that our request latency grows and the iowait stays at
100%, something similar to this
https://www.varnish-cache.org/lists/pipermail/varnish-misc/2008-April/01...
<https://www.varnish-cache.org/lists/pipermail/varnish-misc/2008-April/016139.html>.
And our threads reaches the maximum (1000).

Do you guys have any idea why is that?

Cheers,

Caires
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