[Commit-gnuradio] r8561 - gnuradio/branches/developers/eb/gcell-wip/gcell/src/lib/runtime/spu

[eb]

Author: eb
Date: 2008-06-06 20:43:04 -0600 (Fri, 06 Jun 2008)
New Revision: 8561

Modified:
   gnuradio/branches/developers/eb/gcell-wip/gcell/src/lib/runtime/spu/gc_main.c
Log:
work-in-progress: added random component to backoff.


Modified: 
gnuradio/branches/developers/eb/gcell-wip/gcell/src/lib/runtime/spu/gc_main.c
===================================================================
--- 
gnuradio/branches/developers/eb/gcell-wip/gcell/src/lib/runtime/spu/gc_main.c   
    2008-06-07 00:45:43 UTC (rev 8560)
+++ 
gnuradio/branches/developers/eb/gcell-wip/gcell/src/lib/runtime/spu/gc_main.c   
    2008-06-07 02:43:04 UTC (rev 8561)
@@ -196,6 +196,8 @@
   backoff = _backoff_start;
 }
 
+#if 0
+
 static void
 backoff_delay(void)
 {
@@ -205,6 +207,25 @@
   backoff = ((backoff << 1) + 1) & _backoff_cap;
 }
 
+#else
+
+#define RANDOM_WEIGHT  0.2
+
+static void
+backoff_delay(void)
+{
+  gc_cdelay(backoff);
+
+  backoff = ((backoff << 1) + 1);
+  if (backoff > _backoff_cap)
+    backoff = _backoff_cap;
+
+  float r = (RANDOM_WEIGHT * (2.0 * (gc_uniform_deviate() - 0.5)));
+  backoff = backoff * (1.0 + r);
+}
+
+#endif
+
 // ------------------------------------------------------------------------
 
 static inline unsigned int