http://bugzilla.suse.com/show_bug.cgi?id=1131437
http://bugzilla.suse.com/show_bug.cgi?id=1131437#c20
--- Comment #20 from Giovanni Gherdovich ---
Created attachment 804345
--> http://bugzilla.suse.com/attachment.cgi?id=804345&action=edit
second page extract from the full report
Another page to show that the patterns described previously hold in general.
Next I'm going to attach a 3rd page.
The full report in the form of a multi-page PDF file is at
https://w3.suse.de/~ggherdovich/BSC1131437/flipbook-dbench-2clients.pdf
(~50 MB)
Code and data for the plot is at
https://gitlab.suse.de/ggherdovich/dbench-migrations
Things I forgot to mention in the previous comment:
* a shortcoming of this plots is that the xfs kworker journaling thread is not
traced. I haven't thought yet at how to grab it; probably I could insert a
static tracepoint in the XFS entry point and recognize the interesting kworker
that way. After that is done, crossing data with pstate migration is the same
as already done
* tracing was done with systemtap being careful not to do any IO while the
benchmark was running (all the arrays are kept in memory)
* I verified the regression was present when collecting the data, i.e. tracing
didn't interfere with the benchmark results
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