Workspace exhaustion with Varnish 4 under load

[Poul-Henning Kamp]

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I have seen very little info/experience on tuning V4 yet, and have
no realistic setup to collect info/experience on myself.

Your workspace issue sounds like a clear bug to me, and ESI sounds
very probable as the culprit, sounds ticket-ish to me.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
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FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.