From bdf22e31211ceb80e4cef2ac02849e5ad03197aa Mon Sep 17 00:00:00 2001
From: David Oppenheimer <davidopp@google.com>
Date: Tue, 7 Jul 2015 12:44:31 -0700
Subject: [PATCH] Increase zero-limit pod RAM for spreading to 200 MB to match
 cluster addon pods and represent less trivial fraction of typical machine RAM
 (e.g. n1-standard-1).

---
 .../algorithm/priorities/priorities.go        |  7 +++--
 .../algorithm/priorities/priorities_test.go   | 28 ++++++++++++++-----
 2 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/plugin/pkg/scheduler/algorithm/priorities/priorities.go b/plugin/pkg/scheduler/algorithm/priorities/priorities.go
index 4a4e333131a..1150ac228e3 100644
--- a/plugin/pkg/scheduler/algorithm/priorities/priorities.go
+++ b/plugin/pkg/scheduler/algorithm/priorities/priorities.go
@@ -46,9 +46,10 @@ func calculateScore(requested int64, capacity int64, node string) int {
 // of computing priority only. This ensures that when scheduling zero-limit pods, such
 // pods will not all be scheduled to the machine with the smallest in-use limit,
 // and that when scheduling regular pods, such pods will not see zero-limit pods as
-// consuming no resources whatsoever.
-const defaultMilliCpuLimit int64 = 100            // 0.1 core
-const defaultMemoryLimit int64 = 60 * 1024 * 1024 // 60 MB
+// consuming no resources whatsoever. We chose these values to be similar to the
+// resources that we give to cluster addon pods (#10653). But they are pretty arbitrary.
+const defaultMilliCpuLimit int64 = 100             // 0.1 core
+const defaultMemoryLimit int64 = 200 * 1024 * 1024 // 200 MB
 
 // TODO: Consider setting default as a fixed fraction of machine capacity (take "capacity api.ResourceList"
 // as an additional argument here) rather than using constants
diff --git a/plugin/pkg/scheduler/algorithm/priorities/priorities_test.go b/plugin/pkg/scheduler/algorithm/priorities/priorities_test.go
index b6af3446f29..08fcfaf12c2 100644
--- a/plugin/pkg/scheduler/algorithm/priorities/priorities_test.go
+++ b/plugin/pkg/scheduler/algorithm/priorities/priorities_test.go
@@ -91,12 +91,11 @@ func TestZeroLimit(t *testing.T) {
 		nodes []api.Node
 		test  string
 	}{
-		// The point of these tests is to show you get the same priority for a zero-limit pod
+		// The point of these next two tests is to show you get the same priority for a zero-limit pod
 		// as for a pod with the defaults limits, both when the zero-limit pod is already on the machine
 		// and when the zero-limit pod is the one being scheduled.
 		{
-			pod: &api.Pod{Spec: noResources},
-			// match current f1-micro on GCE
+			pod:   &api.Pod{Spec: noResources},
 			nodes: []api.Node{makeMinion("machine1", 1000, defaultMemoryLimit*10), makeMinion("machine2", 1000, defaultMemoryLimit*10)},
 			test:  "test priority of zero-limit pod with machine with zero-limit pod",
 			pods: []*api.Pod{
@@ -105,8 +104,7 @@ func TestZeroLimit(t *testing.T) {
 			},
 		},
 		{
-			pod: &api.Pod{Spec: small},
-			// match current f1-micro on GCE
+			pod:   &api.Pod{Spec: small},
 			nodes: []api.Node{makeMinion("machine1", 1000, defaultMemoryLimit*10), makeMinion("machine2", 1000, defaultMemoryLimit*10)},
 			test:  "test priority of nonzero-limit pod with machine with zero-limit pod",
 			pods: []*api.Pod{
@@ -114,6 +112,16 @@ func TestZeroLimit(t *testing.T) {
 				{Spec: large2}, {Spec: small2},
 			},
 		},
+		// The point of this test is to verify that we're not just getting the same score no matter what we schedule.
+		{
+			pod:   &api.Pod{Spec: large},
+			nodes: []api.Node{makeMinion("machine1", 1000, defaultMemoryLimit*10), makeMinion("machine2", 1000, defaultMemoryLimit*10)},
+			test:  "test priority of larger pod with machine with zero-limit pod",
+			pods: []*api.Pod{
+				{Spec: large1}, {Spec: noResources1},
+				{Spec: large2}, {Spec: small2},
+			},
+		},
 	}
 
 	const expectedPriority int = 25
@@ -130,8 +138,14 @@ func TestZeroLimit(t *testing.T) {
 			t.Errorf("unexpected error: %v", err)
 		}
 		for _, hp := range list {
-			if hp.Score != expectedPriority {
-				t.Errorf("%s: expected 25 for all priorities, got list %#v", list)
+			if test.test == "test priority of larger pod with machine with zero-limit pod" {
+				if hp.Score == expectedPriority {
+					t.Error("%s: expected non-%d for all priorities, got list %#v", expectedPriority, list)
+				}
+			} else {
+				if hp.Score != expectedPriority {
+					t.Errorf("%s: expected %d for all priorities, got list %#v", expectedPriority, list)
+				}
 			}
 		}
 	}