From 81a9cc31c46aada8ec4ff7e262b8b0a46e2ce57a Mon Sep 17 00:00:00 2001
From: Alex Brainman <alex.brainman@gmail.com>
Date: Thu, 20 Sep 2012 12:06:08 +1000
Subject: [PATCH] misc/cgo/test: do not run wasteCPU during TestParallelSleep
 unless on arm

R=golang-dev, r, minux.ma, dave, bradfitz
CC=golang-dev
https://golang.org/cl/6532052
---
 misc/cgo/test/issue1560.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/misc/cgo/test/issue1560.go b/misc/cgo/test/issue1560.go
index ac897aa33bf..4f49399545f 100644
--- a/misc/cgo/test/issue1560.go
+++ b/misc/cgo/test/issue1560.go
@@ -56,8 +56,12 @@ func wasteCPU() chan struct{} {
 }
 
 func testParallelSleep(t *testing.T) {
-	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(2))
-	defer close(wasteCPU())
+	if runtime.GOARCH == "arm" {
+		// on ARM, the 1.3s deadline is frequently missed,
+		// and burning cpu seems to help
+		defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(2))
+		defer close(wasteCPU())
+	}
 
 	sleepSec := 1
 	start := time.Now()