Subject: performance impact of branch prediction?
To: None <tech-perform@NetBSD.org>
From: Hubert Feyrer <hubert@feyrer.de>
List: tech-kern
Date: 04/21/2006 15:57:55 
Branch prediction is used in many parts throught the kernel, e.g.

subr_pool.c:    if (__predict_false((pc->pc_pool->pr_flags & PR_WANTED) != 0)) {
subr_pool.c-            goto destruct;
subr_pool.c-    }

Does anyone know the performance impact of this prediction?
Were any kind of measurements done? What were the results?


Curious,

 	Hubert