[Bug 212681] I/O is slow for FreeBSD DOMu on XenServer

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212681

--- Comment #25 from Roger Pau Monné <royger at freebsd.org> ---
IIRC this was working fine last time I've tried. Have you loaded the pmc module
(kldload pmc), and which CPU are you using? Note that you also need to enable
the PMU support in Xen [0] by passing vpmu=1 on the Xen command line.

PMC.HASWELL(3) lists RESOURCE_STALLS.ANY as a valid event. If that doesn't work
(or is too complicated to setup) I would try with dtrace, and let's see what we
get.

[0] http://xenbits.xenproject.org/docs/unstable/misc/xen-command-line.html

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