On 1/17/2012 12:55 PM, Taras Glek wrote:
Hi,
As part of the Snappy effort, we asked QA to compare cache effectiveness
of Firefox against Opera (which some people claim has a superior cache).
We have some preliminary data now.
The testplan is described at
https://wiki.mozilla.org/Performance/Snappy/Testing:BFCache_Sprint#Reference_Test_Case
I put up a snapshot of the results at
http://people.mozilla.com/~tglek/snappy/cache1.html
I was suspecting that our cache hit-rates may be worse, but the data
proved that theory wrong.
Data indicates that either writing to our cache is expensive or we are
not http-pipelining/etc properly. My theory is that disk cache is to
blame, so I asked QA to rerun this comparing to Firefox to Firefox with
disk cache disabled.
No-disk-cache followup appears to confirm that writing cache absolutely
annihilates pageload perf.
http://people.mozilla.com/~tglek/snappy/cache2.html
I wonder if this is a symptom of
https://bugzilla.mozilla.org/show_bug.cgi?id=695399
Taras
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