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sys: drop frequency scaling in Linux driver

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Since the kernel USER_HZ constant was introduced and the internal HZ
can't be reliably detected in user-space, the frequency scaling constant
used with older kernels is just a random guess.

Remove the scaling completely and let the closed loop compensate for the
error. To prevent thrashing between two states when the system's
frequency error is close to a multiple of USER_HZ, stick to the current
tick value if it's next to the new required tick. This is used only on
archs where USER_HZ is 100 as the frequency adjustment is limited to 500
ppm.

The linux_hz and linux_freq_scale directives are no longer supported,
but allowed by the config parser.
This commit is contained in:
Miroslav Lichvar
2014-05-22 16:28:20 +02:00
parent 14687d003d
commit e147f2f11e
4 changed files with 45 additions and 164 deletions
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2
conf.h
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@@ -74,8 +74,6 @@ extern void CNF_GetBindAcquisitionAddress(int family, IPAddr *addr);
extern void CNF_GetBindCommandAddress(int family, IPAddr *addr);
extern char *CNF_GetPidFile(void);
extern char *CNF_GetLeapSecTimezone(void);
extern void CNF_GetLinuxHz(int *set, int *hz);
extern void CNF_GetLinuxFreqScale(int *set, double *freq_scale);
/* Value returned in ppm, as read from file */
extern double CNF_GetMaxUpdateSkew(void);