[igt-dev] [PATCH i-g-t] benchmarks/gem_wsim: Perturb static_vcs selection across clients

[Chris Wilson]

Use the client id to alternate the static_vcs balancer (-b context)
across clients - otherwise all clients end up on vcs0 and do not match
the context balancing employed by media-driver.

This may want to be behind the -R flag, but I felt it was a fundamental
property of static context balancing that to keep it disabled by default
causes unfair comparisons and poor workload scheduling, defeating the
purpose of testing.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 benchmarks/gem_wsim.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/benchmarks/gem_wsim.c b/benchmarks/gem_wsim.c
index afb9644dd..8c7e30eb4 100644
--- a/benchmarks/gem_wsim.c
+++ b/benchmarks/gem_wsim.c
@@ -939,7 +939,7 @@ alloc_step_batch(struct workload *wrk, struct w_step *w, unsigned int flags)
 static void
 prepare_workload(unsigned int id, struct workload *wrk, unsigned int flags)
 {
-	unsigned int ctx_vcs = 0;
+	unsigned int ctx_vcs = id & 1;
 	int max_ctx = -1;
 	struct w_step *w;
 	int i;
-- 
2.20.1