Change QUIC's pacing granularity from 5ms to 1ms to match the kernel's

net/quic/quic_sent_packet_manager.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_sent_packet_manager.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 855 matching lines @@
 
 QuicByteCount QuicSentPacketManager::GetSlowStartThreshold() const {
   return send_algorithm_->GetSlowStartThreshold();
 }
 
 void QuicSentPacketManager::EnablePacing() {
   if (using_pacing_) {
     return;
   }
 
-  // Set up a pacing sender with a 5 millisecond alarm granularity.
+  // Set up a pacing sender with a 1 millisecond alarm granularity, the same as
+  // the default granularity of the Linux kernel's FQ qdisc.
   using_pacing_ = true;
   send_algorithm_.reset(
       new PacingSender(send_algorithm_.release(),
-                       QuicTime::Delta::FromMilliseconds(5),
+                       QuicTime::Delta::FromMilliseconds(1),
                        kInitialUnpacedBurst));
 }
 
 }  // namespace net