diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,19 +9,19 @@ endif()
 set(CXX_FLAGS
  -g
  # -DVALGRIND
- # -DMUDUO_STD_STRING
+ -DMUDUO_STD_STRING
  -D_FILE_OFFSET_BITS=64
  -Wall
  -Wextra
  -Werror
  -Wconversion
  -Wno-unused-parameter
- -Wold-style-cast
+ # -Wold-style-cast
  -Woverloaded-virtual
  -Wpointer-arith
- -Wshadow
+ # -Wshadow
  -Wwrite-strings
- -march=native
+ -march=nocona
  # -MMD
  # -std=c++0x
  -rdynamic
@@ -31,7 +31,7 @@ if(CMAKE_BUILD_BITS EQUAL 32)
 endif()
 string(REPLACE ";" " " CMAKE_CXX_FLAGS "${CXX_FLAGS}")
 
-set(CMAKE_CXX_COMPILER "g++")
+set(CMAKE_CXX_COMPILER "g++4")
 #set(CMAKE_CXX_COMPILER "icpc")
 set(CMAKE_CXX_FLAGS_DEBUG "-O0")
 set(CMAKE_CXX_FLAGS_RELEASE "-O2 -finline-limit=1000 -DNDEBUG")
diff --git a/examples/idleconnection/CMakeLists.txt b/examples/idleconnection/CMakeLists.txt
--- a/examples/idleconnection/CMakeLists.txt
+++ b/examples/idleconnection/CMakeLists.txt
@@ -1,4 +1,4 @@
-add_executable(idleconnection_echo echo.cc main.cc)
+add_executable(idleconnection_echo EXCLUDE_FROM_ALL echo.cc main.cc)
 target_link_libraries(idleconnection_echo muduo_net)
 
 add_executable(idleconnection_echo2 sortedlist.cc)
diff --git a/muduo/base/Timestamp.cc b/muduo/base/Timestamp.cc
--- a/muduo/base/Timestamp.cc
+++ b/muduo/base/Timestamp.cc
@@ -4,7 +4,7 @@
 #include <stdio.h>
 #define __STDC_FORMAT_MACROS
 #include <inttypes.h>
-#undef __STDC_FORMAT_MACROS
+//#undef __STDC_FORMAT_MACROS
 
 #include <boost/static_assert.hpp>
 
diff --git a/muduo/base/tests/CMakeLists.txt b/muduo/base/tests/CMakeLists.txt
--- a/muduo/base/tests/CMakeLists.txt
+++ b/muduo/base/tests/CMakeLists.txt
@@ -10,7 +10,7 @@ target_link_libraries(blockingqueue_test muduo_base)
 add_executable(blockingqueue_bench BlockingQueue_bench.cc)
 target_link_libraries(blockingqueue_bench muduo_base)
 
-add_executable(boundedblockingqueue_test BoundedBlockingQueue_test.cc)
+add_executable(boundedblockingqueue_test EXCLUDE_FROM_ALL BoundedBlockingQueue_test.cc)
 target_link_libraries(boundedblockingqueue_test muduo_base)
 
 add_executable(date_unittest Date_unittest.cc)
diff --git a/muduo/net/Channel.cc b/muduo/net/Channel.cc
--- a/muduo/net/Channel.cc
+++ b/muduo/net/Channel.cc
@@ -21,6 +21,10 @@ const int Channel::kNoneEvent = 0;
 const int Channel::kReadEvent = POLLIN | POLLPRI;
 const int Channel::kWriteEvent = POLLOUT;
 
+#ifndef POLLRDHUP
+#define POLLRDHUP  0x2000
+#endif
+
 Channel::Channel(EventLoop* loop, int fd__)
   : loop_(loop),
     fd_(fd__),
diff --git a/muduo/net/Endian.h b/muduo/net/Endian.h
--- a/muduo/net/Endian.h
+++ b/muduo/net/Endian.h
@@ -13,6 +13,7 @@
 
 #include <stdint.h>
 #include <endian.h>
+#include <byteswap.h>
 
 namespace muduo
 {
@@ -23,48 +24,38 @@ namespace sockets
 
 // the inline assembler code makes type blur,
 // so we disable warnings for a while.
-#if __GNUC_MINOR__ >= 6
-#pragma GCC diagnostic push
-#endif
-#pragma GCC diagnostic ignored "-Wconversion"
-#pragma GCC diagnostic ignored "-Wold-style-cast"
+#if __BYTE_ORDER == __LITTLE_ENDIAN
 inline uint64_t hostToNetwork64(uint64_t host64)
 {
-  return htobe64(host64);
+  return bswap_64(host64);
 }
 
 inline uint32_t hostToNetwork32(uint32_t host32)
 {
-  return htobe32(host32);
+  return bswap_32(host32);
 }
 
 inline uint16_t hostToNetwork16(uint16_t host16)
 {
-  return htobe16(host16);
+  return bswap_16(host16);
 }
 
 inline uint64_t networkToHost64(uint64_t net64)
 {
-  return be64toh(net64);
+  return bswap_64(net64);
 }
 
 inline uint32_t networkToHost32(uint32_t net32)
 {
-  return be32toh(net32);
+  return bswap_32(net32);
 }
 
 inline uint16_t networkToHost16(uint16_t net16)
 {
-  return be16toh(net16);
+  return bswap_16(net16);
 }
-#if __GNUC_MINOR__ >= 6
-#pragma GCC diagnostic pop
-#else
-#pragma GCC diagnostic error "-Wconversion"
-#pragma GCC diagnostic error "-Wold-style-cast"
 #endif
 
-
 }
 }
 }
diff --git a/muduo/net/EventLoop.cc b/muduo/net/EventLoop.cc
--- a/muduo/net/EventLoop.cc
+++ b/muduo/net/EventLoop.cc
@@ -18,7 +18,8 @@
 #include <boost/bind.hpp>
 
 #include <signal.h>
-#include <sys/eventfd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
 
 using namespace muduo;
 using namespace muduo::net;
@@ -29,18 +30,6 @@ __thread EventLoop* t_loopInThisThread = 0;
 
 const int kPollTimeMs = 10000;
 
-int createEventfd()
-{
-  int evtfd = ::eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
-  if (evtfd < 0)
-  {
-    LOG_SYSERR << "Failed in eventfd";
-    abort();
-  }
-  return evtfd;
-}
-
-#pragma GCC diagnostic ignored "-Wold-style-cast"
 class IgnoreSigPipe
 {
  public:
@@ -50,7 +39,6 @@ class IgnoreSigPipe
     LOG_TRACE << "Ignore SIGPIPE";
   }
 };
-#pragma GCC diagnostic error "-Wold-style-cast"
 
 IgnoreSigPipe initObj;
 }
@@ -69,11 +57,17 @@ EventLoop::EventLoop()
     threadId_(CurrentThread::tid()),
     poller_(Poller::newDefaultPoller(this)),
     timerQueue_(new TimerQueue(this)),
-    wakeupFd_(createEventfd()),
-    wakeupChannel_(new Channel(this, wakeupFd_)),
     currentActiveChannel_(NULL)
 {
   LOG_DEBUG << "EventLoop created " << this << " in thread " << threadId_;
+  if (::socketpair(AF_UNIX, SOCK_STREAM, 0, wakeupFd_) < 0)
+  {
+    LOG_SYSFATAL << "Failed in socketpair";
+  }
+  sockets::setNonBlockAndCloseOnExec(wakeupFd_[0]);
+  sockets::setNonBlockAndCloseOnExec(wakeupFd_[1]);
+  wakeupChannel_.reset(new Channel(this, wakeupFd_[0]));
+
   if (t_loopInThisThread)
   {
     LOG_FATAL << "Another EventLoop " << t_loopInThisThread
@@ -93,7 +87,8 @@ EventLoop::~EventLoop()
 {
   LOG_DEBUG << "EventLoop " << this << " of thread " << threadId_
             << " destructs in thread " << CurrentThread::tid();
-  ::close(wakeupFd_);
+  ::close(wakeupFd_[0]);
+  ::close(wakeupFd_[1]);
   t_loopInThisThread = NULL;
 }
 
@@ -108,12 +103,13 @@ void EventLoop::loop()
   while (!quit_)
   {
     activeChannels_.clear();
-    pollReturnTime_ = poller_->poll(kPollTimeMs, &activeChannels_);
+    pollReturnTime_ = poller_->poll(timerQueue_->getTimeout(), &activeChannels_);
     ++iteration_;
     if (Logger::logLevel() <= Logger::TRACE)
     {
       printActiveChannels();
     }
+    timerQueue_->processTimers();
     // TODO sort channel by priority
     eventHandling_ = true;
     for (ChannelList::iterator it = activeChannels_.begin();
@@ -215,22 +211,19 @@ void EventLoop::abortNotInLoopThread()
 
 void EventLoop::wakeup()
 {
-  uint64_t one = 1;
-  ssize_t n = sockets::write(wakeupFd_, &one, sizeof one);
+  char one = '1';
+  ssize_t n = sockets::write(wakeupFd_[1], &one, sizeof one);
   if (n != sizeof one)
   {
-    LOG_ERROR << "EventLoop::wakeup() writes " << n << " bytes instead of 8";
+    LOG_ERROR << "EventLoop::wakeup() writes " << n << " bytes instead of 1";
   }
 }
 
 void EventLoop::handleRead()
 {
-  uint64_t one = 1;
-  ssize_t n = sockets::read(wakeupFd_, &one, sizeof one);
-  if (n != sizeof one)
-  {
-    LOG_ERROR << "EventLoop::handleRead() reads " << n << " bytes instead of 8";
-  }
+  char buf[4096] = { 0 };
+  ssize_t n = sockets::read(wakeupFd_[0], buf, sizeof buf);
+  (void)n;
 }
 
 void EventLoop::doPendingFunctors()
diff --git a/muduo/net/EventLoop.h b/muduo/net/EventLoop.h
--- a/muduo/net/EventLoop.h
+++ b/muduo/net/EventLoop.h
@@ -130,7 +130,7 @@ class EventLoop : boost::noncopyable
   Timestamp pollReturnTime_;
   boost::scoped_ptr<Poller> poller_;
   boost::scoped_ptr<TimerQueue> timerQueue_;
-  int wakeupFd_;
+  int wakeupFd_[2];
   // unlike in TimerQueue, which is an internal class,
   // we don't expose Channel to client.
   boost::scoped_ptr<Channel> wakeupChannel_;
diff --git a/muduo/net/InetAddress.cc b/muduo/net/InetAddress.cc
--- a/muduo/net/InetAddress.cc
+++ b/muduo/net/InetAddress.cc
@@ -17,9 +17,7 @@
 #include <boost/static_assert.hpp>
 
 // INADDR_ANY use (type)value casting.
-#pragma GCC diagnostic ignored "-Wold-style-cast"
 static const in_addr_t kInaddrAny = INADDR_ANY;
-#pragma GCC diagnostic error "-Wold-style-cast"
 
 //     /* Structure describing an Internet socket address.  */
 //     struct sockaddr_in {
diff --git a/muduo/net/SocketsOps.cc b/muduo/net/SocketsOps.cc
--- a/muduo/net/SocketsOps.cc
+++ b/muduo/net/SocketsOps.cc
@@ -37,7 +37,9 @@ SA* sockaddr_cast(struct sockaddr_in* addr)
   return static_cast<SA*>(implicit_cast<void*>(addr));
 }
 
-void setNonBlockAndCloseOnExec(int sockfd)
+}
+
+void sockets::setNonBlockAndCloseOnExec(int sockfd)
 {
   // non-block
   int flags = ::fcntl(sockfd, F_GETFL, 0);
@@ -54,12 +56,9 @@ void setNonBlockAndCloseOnExec(int sockfd)
   (void)ret;
 }
 
-}
-
 int sockets::createNonblockingOrDie()
 {
   // socket
-#if VALGRIND
   int sockfd = ::socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
   if (sockfd < 0)
   {
@@ -67,13 +66,6 @@ int sockets::createNonblockingOrDie()
   }
 
   setNonBlockAndCloseOnExec(sockfd);
-#else
-  int sockfd = ::socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, IPPROTO_TCP);
-  if (sockfd < 0)
-  {
-    LOG_SYSFATAL << "sockets::createNonblockingOrDie";
-  }
-#endif
   return sockfd;
 }
 
@@ -98,13 +90,8 @@ void sockets::listenOrDie(int sockfd)
 int sockets::accept(int sockfd, struct sockaddr_in* addr)
 {
   socklen_t addrlen = static_cast<socklen_t>(sizeof *addr);
-#if VALGRIND
   int connfd = ::accept(sockfd, sockaddr_cast(addr), &addrlen);
   setNonBlockAndCloseOnExec(connfd);
-#else
-  int connfd = ::accept4(sockfd, sockaddr_cast(addr),
-                         &addrlen, SOCK_NONBLOCK | SOCK_CLOEXEC);
-#endif
   if (connfd < 0)
   {
     int savedErrno = errno;
diff --git a/muduo/net/SocketsOps.h b/muduo/net/SocketsOps.h
--- a/muduo/net/SocketsOps.h
+++ b/muduo/net/SocketsOps.h
@@ -25,6 +25,8 @@ namespace sockets
 /// abort if any error.
 int createNonblockingOrDie();
 
+void setNonBlockAndCloseOnExec(int sockfd);
+
 int  connect(int sockfd, const struct sockaddr_in& addr);
 void bindOrDie(int sockfd, const struct sockaddr_in& addr);
 void listenOrDie(int sockfd);
diff --git a/muduo/net/TimerQueue.cc b/muduo/net/TimerQueue.cc
--- a/muduo/net/TimerQueue.cc
+++ b/muduo/net/TimerQueue.cc
@@ -16,8 +16,6 @@
 
 #include <boost/bind.hpp>
 
-#include <sys/timerfd.h>
-
 namespace muduo
 {
 namespace net
@@ -25,57 +23,15 @@ namespace net
 namespace detail
 {
 
-int createTimerfd()
-{
-  int timerfd = ::timerfd_create(CLOCK_MONOTONIC,
-                                 TFD_NONBLOCK | TFD_CLOEXEC);
-  if (timerfd < 0)
-  {
-    LOG_SYSFATAL << "Failed in timerfd_create";
-  }
-  return timerfd;
-}
-
-struct timespec howMuchTimeFromNow(Timestamp when)
+int howMuchTimeFromNow(Timestamp when)
 {
   int64_t microseconds = when.microSecondsSinceEpoch()
                          - Timestamp::now().microSecondsSinceEpoch();
-  if (microseconds < 100)
-  {
-    microseconds = 100;
-  }
-  struct timespec ts;
-  ts.tv_sec = static_cast<time_t>(
-      microseconds / Timestamp::kMicroSecondsPerSecond);
-  ts.tv_nsec = static_cast<long>(
-      (microseconds % Timestamp::kMicroSecondsPerSecond) * 1000);
-  return ts;
-}
-
-void readTimerfd(int timerfd, Timestamp now)
-{
-  uint64_t howmany;
-  ssize_t n = ::read(timerfd, &howmany, sizeof howmany);
-  LOG_TRACE << "TimerQueue::handleRead() " << howmany << " at " << now.toString();
-  if (n != sizeof howmany)
-  {
-    LOG_ERROR << "TimerQueue::handleRead() reads " << n << " bytes instead of 8";
-  }
-}
-
-void resetTimerfd(int timerfd, Timestamp expiration)
-{
-  // wake up loop by timerfd_settime()
-  struct itimerspec newValue;
-  struct itimerspec oldValue;
-  bzero(&newValue, sizeof newValue);
-  bzero(&oldValue, sizeof oldValue);
-  newValue.it_value = howMuchTimeFromNow(expiration);
-  int ret = ::timerfd_settime(timerfd, 0, &newValue, &oldValue);
-  if (ret)
+  if (microseconds < 1000)
   {
-    LOG_SYSERR << "timerfd_settime()";
+    microseconds = 1000;
   }
+  return static_cast<int>(microseconds / 1000);
 }
 
 }
@@ -88,20 +44,13 @@ using namespace muduo::net::detail;
 
 TimerQueue::TimerQueue(EventLoop* loop)
   : loop_(loop),
-    timerfd_(createTimerfd()),
-    timerfdChannel_(loop, timerfd_),
     timers_(),
     callingExpiredTimers_(false)
 {
-  timerfdChannel_.setReadCallback(
-      boost::bind(&TimerQueue::handleRead, this));
-  // we are always reading the timerfd, we disarm it with timerfd_settime.
-  timerfdChannel_.enableReading();
 }
 
 TimerQueue::~TimerQueue()
 {
-  ::close(timerfd_);
   // do not remove channel, since we're in EventLoop::dtor();
   for (TimerList::iterator it = timers_.begin();
       it != timers_.end(); ++it)
@@ -129,11 +78,19 @@ void TimerQueue::cancel(TimerId timerId)
 void TimerQueue::addTimerInLoop(Timer* timer)
 {
   loop_->assertInLoopThread();
-  bool earliestChanged = insert(timer);
+  insert(timer);
+}
 
-  if (earliestChanged)
+int TimerQueue::getTimeout() const
+{
+  loop_->assertInLoopThread();
+  if (timers_.empty())
+  {
+    return 10000;
+  }
+  else
   {
-    resetTimerfd(timerfd_, timer->expiration());
+    return howMuchTimeFromNow(timers_.begin()->second->expiration());
   }
 }
 
@@ -157,11 +114,10 @@ void TimerQueue::cancelInLoop(TimerId timerId)
   assert(timers_.size() == activeTimers_.size());
 }
 
-void TimerQueue::handleRead()
+void TimerQueue::processTimers()
 {
   loop_->assertInLoopThread();
   Timestamp now(Timestamp::now());
-  readTimerfd(timerfd_, now);
 
   std::vector<Entry> expired = getExpired(now);
 
@@ -225,11 +181,6 @@ void TimerQueue::reset(const std::vector<Entry>& expired, Timestamp now)
   {
     nextExpire = timers_.begin()->second->expiration();
   }
-
-  if (nextExpire.valid())
-  {
-    resetTimerfd(timerfd_, nextExpire);
-  }
 }
 
 bool TimerQueue::insert(Timer* timer)
diff --git a/muduo/net/TimerQueue.h b/muduo/net/TimerQueue.h
--- a/muduo/net/TimerQueue.h
+++ b/muduo/net/TimerQueue.h
@@ -51,6 +51,9 @@ class TimerQueue : boost::noncopyable
 
   void cancel(TimerId timerId);
 
+  int getTimeout() const;
+  void processTimers();
+
  private:
 
   // FIXME: use unique_ptr<Timer> instead of raw pointers.
@@ -61,8 +64,6 @@ class TimerQueue : boost::noncopyable
 
   void addTimerInLoop(Timer* timer);
   void cancelInLoop(TimerId timerId);
-  // called when timerfd alarms
-  void handleRead();
   // move out all expired timers
   std::vector<Entry> getExpired(Timestamp now);
   void reset(const std::vector<Entry>& expired, Timestamp now);
@@ -70,9 +71,6 @@ class TimerQueue : boost::noncopyable
   bool insert(Timer* timer);
 
   EventLoop* loop_;
-  const int timerfd_;
-  Channel timerfdChannel_;
-  // Timer list sorted by expiration
   TimerList timers_;
 
   // for cancel()
diff --git a/muduo/net/poller/EPollPoller.cc b/muduo/net/poller/EPollPoller.cc
--- a/muduo/net/poller/EPollPoller.cc
+++ b/muduo/net/poller/EPollPoller.cc
@@ -26,7 +26,6 @@ using namespace muduo::net;
 BOOST_STATIC_ASSERT(EPOLLIN == POLLIN);
 BOOST_STATIC_ASSERT(EPOLLPRI == POLLPRI);
 BOOST_STATIC_ASSERT(EPOLLOUT == POLLOUT);
-BOOST_STATIC_ASSERT(EPOLLRDHUP == POLLRDHUP);
 BOOST_STATIC_ASSERT(EPOLLERR == POLLERR);
 BOOST_STATIC_ASSERT(EPOLLHUP == POLLHUP);
 
@@ -39,7 +38,7 @@ const int kDeleted = 2;
 
 EPollPoller::EPollPoller(EventLoop* loop)
   : Poller(loop),
-    epollfd_(::epoll_create1(EPOLL_CLOEXEC)),
+    epollfd_(::epoll_create(32)),
     events_(kInitEventListSize)
 {
   if (epollfd_ < 0)