vppinfra: deal with 0 return from os_cpu_clock_frequency()
Sporadic reports of os_cpu_clock_frequency() returning 0.0 in highly
parallel container environments.
To avoid immediate division by zero:
Step 1: try estimate_clock_frequency(1e-3).
Step 2: give up. Pretend we have a 2gHz clock.
Type: fix
@@ -208,6 +208,22 @@ clib_time_init (clib_time_t * c)
{
clib_memset (c, 0, sizeof (c[0]));
c->clocks_per_second = os_cpu_clock_frequency ();
+ /*
+ * Sporadic reports of os_cpu_clock_frequency() returning 0.0
+ * in highly parallel container environments.
+ * To avoid immediate division by zero:
+ * Step 1: try estimate_clock_frequency().
+ * Step 2: give up. Pretend we have a 2gHz clock.
+ */
+ if (PREDICT_FALSE (c->clocks_per_second == 0.0))
+ {
+ c->clocks_per_second = estimate_clock_frequency (1e-3);
+ if (c->clocks_per_second == 0.0)
+ {
+ clib_warning ("os_cpu_clock_frequency() returned 0.0, use 2e9...");
+ c->clocks_per_second = 2e9;
+ }
+ }
c->seconds_per_clock = 1 / c->clocks_per_second;
c->log2_clocks_per_second = min_log2_u64 ((u64) c->clocks_per_second);
