diff --git a/compiler-rt/lib/tsan/rtl/tsan_trace.h b/compiler-rt/lib/tsan/rtl/tsan_trace.h
--- a/compiler-rt/lib/tsan/rtl/tsan_trace.h
+++ b/compiler-rt/lib/tsan/rtl/tsan_trace.h
@@ -191,7 +191,8 @@
 };
 
 struct TracePart : TraceHeader {
-  static constexpr uptr kByteSize = 256 << 10;
+  // There are a lot of goroutines in Go, so we use smaller parts.
+  static constexpr uptr kByteSize = (SANITIZER_GO ? 128 : 256) << 10;
   static constexpr uptr kSize =
       (kByteSize - sizeof(TraceHeader)) / sizeof(Event);
   // TraceAcquire does a fast event pointer overflow check by comparing