diff --git a/oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/file/FileStore.java b/oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/file/FileStore.java
index 7145bd1..8467ea5 100644
--- a/oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/file/FileStore.java
+++ b/oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/file/FileStore.java
@@ -844,8 +844,8 @@ public class FileStore extends AbstractFileStore {
                     return -newGeneration;
                 }
 
-                gcListener.info("TarMK GC #{}: compacted {} to {}",
-                        GC_COUNT, before.getRecordId(), after.getRecordId());
+                gcListener.info("TarMK GC #{}: compaction cycle 0 completed in {} ({} ms). Compacted {} to {}",
+                        GC_COUNT, watch, watch.elapsed(MILLISECONDS), before.getRecordId(), after.getRecordId());
 
                 int cycles = 0;
                 boolean success = false;
@@ -859,6 +859,7 @@ public class FileStore extends AbstractFileStore {
                                     "Compacting these commits. Cycle {} of {}",
                             GC_COUNT, cycles, gcOptions.getRetryCount());
                     gcListener.updateStatus(COMPACTION_RETRY.message() + cycles);
+                    Stopwatch cycleWatch = Stopwatch.createStarted();
                     
                     SegmentNodeState head = getHead();
                     after = compact(head, writer, cancel);
@@ -867,8 +868,9 @@ public class FileStore extends AbstractFileStore {
                         return -newGeneration;
                     }
 
-                    gcListener.info("TarMK GC #{}: compacted {} against {} to {}",
-                            GC_COUNT, head.getRecordId(), before.getRecordId(), after.getRecordId());
+                    gcListener.info("TarMK GC #{}: compaction cycle {} completed in {} ({} ms). Compacted {} against {} to {}",
+                            GC_COUNT, cycles, cycleWatch, cycleWatch.elapsed(MILLISECONDS),
+                            head.getRecordId(), before.getRecordId(), after.getRecordId());
                     before = head;
                 }
 
@@ -877,20 +879,28 @@ public class FileStore extends AbstractFileStore {
                             GC_COUNT, cycles);
                     int forceTimeout = gcOptions.getForceTimeout();
                     if (forceTimeout > 0) {
-                        gcListener.info("TarMK GC #{}: trying to force compact remaining commits for {} seconds",
+                        gcListener.info("TarMK GC #{}: trying to force compact remaining commits for {} seconds. " +
+                                "Concurrent commits to the store will be blocked.",
                                 GC_COUNT, forceTimeout);
                         gcListener.updateStatus(COMPACTION_FORCE_COMPACT.message());
+                        Stopwatch forceWatch = Stopwatch.createStarted();
                         
                         cycles++;
                         success = forceCompact(writer, or(cancel, timeOut(forceTimeout, SECONDS)));
                         if (!success) {
                             if (cancel.get()) {
-                                gcListener.warn("TarMK GC #{}: compaction failed to force compact remaining commits. " +
-                                        "Compaction was cancelled: {}.", GC_COUNT, cancel);
+                                gcListener.warn("TarMK GC #{}: compaction failed to force compact remaining commits " +
+                                        "after {} ({} ms). Compaction was cancelled: {}.",
+                                        GC_COUNT, forceWatch, forceWatch.elapsed(MILLISECONDS), cancel);
                             } else {
                                 gcListener.warn("TarMK GC #{}: compaction failed to force compact remaining commits. " +
-                                        "Most likely compaction didn't get exclusive access to the store.", GC_COUNT);
+                                        "after {} ({} ms). Most likely compaction didn't get exclusive access to the store.",
+                                        GC_COUNT, forceWatch, forceWatch.elapsed(MILLISECONDS));
                             }
+                        } else {
+                            gcListener.info("TarMK GC #{}: compaction succeeded to force compact remaining commits " +
+                                            "after {} ({} ms).",
+                                            GC_COUNT, forceWatch, forceWatch.elapsed(MILLISECONDS));
                         }
                     }
                 }
@@ -1110,7 +1120,7 @@ public class FileStore extends AbstractFileStore {
             for (TarReader oldReader : oldReaders) {
                 closeAndLogOnFail(oldReader);
                 File file = oldReader.getFile();
-                gcListener.info("TarMK GC #{}: cleanup marking file for deletion: {}", GC_COUNT, file.getName());
+                gcListener.info("cleanup marking file for deletion: {}", GC_COUNT, file.getName());
                 toRemove.addLast(file);
             }