Varnish3 and Munin : Hit rate exceeds 100%

[Geoff Simmons]

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On 01/12/2016 04:18 PM, maxence at bothorel.net wrote:
> 
> client_req              2977215        34.73 Client requests
> received cache_hit              5095361        59.44 Cache hits 
> cache_hitpass          64796         0.76 Cache hits for pass 
> cache_miss            834384         9.73 Cache misses

hitrate = cache_hit / (cache_hit + cache_miss) = 86%

client_req doesn't enter into the equation.

> We can see there are more cache_hit than client_req. I wonder if
> this problem is due to ESI request, which is not use in the graph.

Yes, client_req only counts "incoming" requests, while client_hit,
_hitpass and _miss also include results from ESIs.

> Is there a way to include ESI requests in the graph ?

Since both cache_hit and cache_miss count hits and misses from ESIs,
the hitrate equation will in fact account for the ESIs as well.

> You can see a graph here :
> https://lut.im/v4u71OPh4C/q5xNkDneiftmsH2b.png

I get an SSL error from that link.


HTH,
Geoff
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