Varnish 3.x Expiry Thread overload

Lasse Karstensen lkarsten at
Mon Aug 26 15:38:41 CEST 2013

On Mon, Aug 26, 2013 at 11:10:10AM +0200, Ricardo Bartolome Mendez wrote:
> Does anybody have an idea about what's going on?

Hi Ricardo.

I ran this by Martin and Dag.

Just to make sure, are there a lot of bans in use? We're assuming no.

Our best guess based on the data supplied is that the tiny object handling in
the file backend is the source of this. Many small objects mixed with
larger objects makes a bad combination on -sfile.

We've seen a problem that did appear similar on a customer rig not long ago.

Our best suggestion is to reconfigure the system for swap and use -smalloc
instead, and see how that goes. This is contrary to the usual recommendations.

If you can I'd recommend adding some disk IO latency monitoring.
With regards,
Lasse Karstensen
Varnish Software AS

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