diff --git a/RxSwift/Observables/Observable+Single.swift b/RxSwift/Observables/Observable+Single.swift
index 675bb472..7b1efb9c 100644
--- a/RxSwift/Observables/Observable+Single.swift
+++ b/RxSwift/Observables/Observable+Single.swift
@@ -131,7 +131,9 @@ extension ObservableType {
     /**
     Repeats the source observable sequence the specified number of times in case of an error or until it successfully terminates.
     
-    - parameter maxAttemptCount: Number of times to repeat the sequence.
+    If you encounter an error and want it to retry once, then you must use `retry(2)`
+
+    - parameter maxAttemptCount: Maximum number of times to repeat the sequence.
     - returns: An observable sequence producing the elements of the given sequence repeatedly until it terminates successfully.
     */
     public func retry(maxAttemptCount: Int)
diff --git a/RxTests/PerformanceTests/main.swift b/RxTests/PerformanceTests/main.swift
index f46c887e..53ce2b89 100644
--- a/RxTests/PerformanceTests/main.swift
+++ b/RxTests/PerformanceTests/main.swift
@@ -32,7 +32,7 @@ func measureTime(@noescape work: () -> ()) -> UInt64 {
     }
     let timeInNano = (mach_absolute_time() - start) * UInt64(timebaseInfo.numer) / UInt64(timebaseInfo.denom)
 
-    return approxValuePerIteration(timeInNano) / 1000
+    return approxValuePerIteration(timeInNano) / UInt64(NumberOfIterations)
 }
 
 func measureMemoryUsage(@noescape work: () -> ()) -> (bytesAllocated: UInt64, allocations: UInt64) {
diff --git a/RxTests/RxTests.xcodeproj/project.pbxproj b/RxTests/RxTests.xcodeproj/project.pbxproj
index 34ec7ba2..2362c406 100644
--- a/RxTests/RxTests.xcodeproj/project.pbxproj
+++ b/RxTests/RxTests.xcodeproj/project.pbxproj
@@ -199,7 +199,6 @@
 		C84B8FC11B89D0D500C9CCCF /* BagTest.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = BagTest.swift; sourceTree = "<group>"; };
 		C85F4E421B7F70EA00A866C7 /* CompositeObserverTest.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CompositeObserverTest.swift; sourceTree = "<group>"; };
 		C8633AE41B0A9FF300375D60 /* KVOObservableTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = KVOObservableTests.swift; sourceTree = "<group>"; };
-		C868D0EF1BB75EA1003D1474 /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
 		C868D0F81BB76A29003D1474 /* PerformanceTools.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = PerformanceTools.swift; sourceTree = "<group>"; };
 		C868D1091BB950D3003D1474 /* PerformanceTests.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = PerformanceTests.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		C868D10B1BB950D4003D1474 /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
@@ -270,7 +269,6 @@
 				C8A468CC1B8A897800BF917B /* RxCocoa.framework */,
 				C836EA001B8A76A900AB941D /* RxSwift.framework */,
 				C81108221AF50E11001C13E4 /* Tests */,
-				C868D0EE1BB75EA1003D1474 /* PerformanceTests */,
 				C868D10A1BB950D4003D1474 /* PerformanceTests */,
 				C81108211AF50E11001C13E4 /* Products */,
 			);
@@ -400,14 +398,6 @@
 			path = Tests;
 			sourceTree = "<group>";
 		};
-		C868D0EE1BB75EA1003D1474 /* PerformanceTests */ = {
-			isa = PBXGroup;
-			children = (
-				C868D0EF1BB75EA1003D1474 /* main.swift */,
-			);
-			path = PerformanceTests;
-			sourceTree = "<group>";
-		};
 		C868D10A1BB950D4003D1474 /* PerformanceTests */ = {
 			isa = PBXGroup;
 			children = (
diff --git a/RxTests/Tests/PerformanceTools.swift b/RxTests/Tests/PerformanceTools.swift
index 5701de9e..bc2422c9 100644
--- a/RxTests/Tests/PerformanceTools.swift
+++ b/RxTests/Tests/PerformanceTools.swift
@@ -57,8 +57,6 @@ func registerMallocHooks() {
 
     assert(Int(count) <= proxies.count)
 
-    let defaultZone = malloc_default_zone()
-
     for i in 0 ..< Int(count) {
         let zoneArray = zones.advancedBy(i)
         let name = malloc_get_zone_name(zoneArray.memory)
@@ -72,7 +70,7 @@ func registerMallocHooks() {
 
         let protectSize = vm_size_t(sizeof(malloc_zone_t)) * vm_size_t(count)
 
-        if zone.version >= 8 {
+        if true {
             let addressPointer = UnsafeMutablePointer<vm_address_t>(zoneArray)
             let res = vm_protect(mach_task_self_, addressPointer.memory, protectSize, 0, PROT_READ | PROT_WRITE)
             assert(res == 0)
@@ -80,7 +78,7 @@ func registerMallocHooks() {
 
         zoneArray.memory.memory = zone
 
-        if defaultZone.memory.version == 8 {
+        if true {
             let res = vm_protect(mach_task_self_, _zones.memory, protectSize, 0, PROT_READ)
             assert(res == 0)
         }