diff --git a/camera/cameraserver/cameraserver.rc b/camera/cameraserver/cameraserver.rc
index 16d9da8..09f9789 100644
--- a/camera/cameraserver/cameraserver.rc
+++ b/camera/cameraserver/cameraserver.rc
@@ -1,6 +1,6 @@
 service cameraserver /system/bin/cameraserver
     class main
     user cameraserver
-    group audio camera drmrpc inet media mediadrm net_bt net_bt_admin net_bw_acct
+    group audio camera input drmrpc inet media mediadrm net_bt net_bt_admin net_bw_acct
     ioprio rt 4
     writepid /dev/cpuset/foreground/tasks
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 3759424..30bdef5 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -2285,6 +2285,7 @@
             kUseFastMixer == FastMixer_Dynamic)) {
         size_t minNormalFrameCount = (kMinNormalSinkBufferSizeMs * mSampleRate) / 1000;
         size_t maxNormalFrameCount = (kMaxNormalSinkBufferSizeMs * mSampleRate) / 1000;
+
         // round up minimum and round down maximum to nearest 16 frames to satisfy AudioMixer
         minNormalFrameCount = (minNormalFrameCount + 15) & ~15;
         maxNormalFrameCount = maxNormalFrameCount & ~15;
@@ -2301,18 +2302,7 @@
                 multiplier = (double) maxNormalFrameCount / (double) mFrameCount;
             }
         } else {
-            // prefer an even multiplier, for compatibility with doubling of fast tracks due to HAL
-            // SRC (it would be unusual for the normal sink buffer size to not be a multiple of fast
-            // track, but we sometimes have to do this to satisfy the maximum frame count
-            // constraint)
-            // FIXME this rounding up should not be done if no HAL SRC
-            uint32_t truncMult = (uint32_t) multiplier;
-            if ((truncMult & 1)) {
-                if ((truncMult + 1) * mFrameCount <= maxNormalFrameCount) {
-                    ++truncMult;
-                }
-            }
-            multiplier = (double) truncMult;
+            multiplier = floor(multiplier);
         }
     }
     mNormalFrameCount = multiplier * mFrameCount;
@@ -3175,6 +3165,11 @@
                         // (1) mixer threads without a fast mixer (which has its own warm-up)
                         // (2) minimum buffer sized tracks (even if the track is full,
                         //     the app won't fill fast enough to handle the sudden draw).
+                        //
+                        // Total time spent in last processing cycle equals time spent in
+                        // 1. threadLoop_write, as well as time spent in
+                        // 2. threadLoop_mix (significant for heavy mixing, especially
+                        //                    on low tier processors)
 
                         // it's OK if deltaMs is an overestimate.
                         const int32_t deltaMs =