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timeval: Increase accuracy of cached time 4X, from 100 ms to 25 ms.

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With CFM and other tunnel monitoring protocols, having a fairly precise
time is good.  My measurements don't show this change increasing CPU use.
(In fact it appears to repeatably reduce CPU use slightly, from about
22% to about 20% with 1000 CFM instances, although it's not obvious why.)

Bug #15171.
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
This commit is contained in:
Ben Pfaff
2013-03-05 13:12:08 -08:00
parent 3d6702a2e6
commit 67a2f47310
1 changed files with 1 additions and 1 deletions
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lib/timeval.h
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@@ -43,7 +43,7 @@ BUILD_ASSERT_DECL(TYPE_IS_SIGNED(time_t));
/* Interval between updates to the reported time, in ms. This should not be
* adjusted much below 10 ms or so with the current implementation, or too
* much time will be wasted in signal handlers and calls to clock_gettime(). */
#define TIME_UPDATE_INTERVAL 100
#define TIME_UPDATE_INTERVAL 25
/* True on systems that support a monotonic clock. Compared to just getting
* the value of a variable, clock_gettime() is somewhat expensive, even on