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[cperciva] In cf_get_method, when we don't already know what clock speed the 
CPU is
running at, guess the nearest value instead of looking for a value within
25 MHz of the observed frequency.

Prior to this change, if a system booted with Intel Turbo Boost enabled,
the dev.cpu.0.freq sysctl is nonfunctional, since the ACPI-reported
frequency for Turbo Boost states does not match the actual clock frequency
(and thus no levels are within 25 MHz of the observed frequency) and the
current performance level is read before a new level is set.

MFC after:      3 days
Relnotes:       Bug fix in power management on CPUs with Intel Turbo Boost

[hselasky] Optimise host mode data roundtrip time. When BULK data is submitted 
the main processing queue, clear the NAK counter for any associated
BULK or CONTROL transfers and poll the endpoint(s) for 1 millisecond
at 125us rate interval, before going into slow, 10ms, NAK polling mode
again.  This has the effect that typical ping-ping protocols respond
quicker when initiated from the USB host.

MFC after:      2 weeks

Started by upstream project "FreeBSD_HEAD" build number 647
originally caused by:
 Started by an SCM change
Building remotely on (FreeBSD-10) in workspace 
Updating svn:// at revision 
'2014-05-11T10:39:51.794 +0000'
U         kern/kern_cpu.c
U         dev/usb/controller/dwc_otg.c
U         dev/usb/controller/dwc_otg.h
At revision 265876
Updating svn:// at revision 
'2014-05-11T10:39:51.794 +0000'
At revision 265876
no change for svn:// since the previous build
[FreeBSD_HEAD-modules] $ /bin/sh -xe /tmp/
+ export JFLAG=-j4
+ export 
+ cd 
+ echo '=== make cleandir ==='
=== make cleandir ===
+ make cleandir
===> aac (cleandir)
 line 24: Could not find ../../share/mk/
 line 38: Malformed conditional (${MK_FORMAT_EXTENSIONS} == "no")
make[1]: Fatal errors encountered -- cannot continue
make[1]: stopped in 
*** Error code 1

make: stopped in 
Build step 'Execute shell' marked build as failure
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