[Boost-users] Setting QOS doesn't work?

Subject: [Boost-users] Setting QOS doesn't work?
From: Dominique Lacerte (dlacerte_at_[hidden])
Date: 2009-10-07 12:12:10

Hi,

I have some QOS code in a product that is working fine. We're porting that code to using the socket support in ASIO and the QOS code doesn't seem to be working any longer. We're using WinXP under both environments and running our old code works fine but the new code has issues. Setting the TOS bits via:

::setsockopt(mSocket.native(), IPPROTO_IP, IP_TOS, (char *)(&uiTOS), sizeof(uiTOS))

Works fine, but setting the service type does not. We're making the following call:

   DWORD dwBytesReturned = 0;
   bool bSuccess = (SOCKET_ERROR != ::WSAIoctl(
      mSocket.native(),
      SIO_SET_QOS,
      (void *)reinterpret_cast<const BYTE *>(&tQOS),
      sizeof(tQOS),
      NULL,
      0,
      &dwBytesReturned,
      NULL,
      NULL
   ));

With values such as:

SocketAddress bytes: 0200fc22c0a863670000000000000000
===RX===
TokenRate: -1
TokenBucketSize: -1
PeakBandwidth: -1
Latency: -1
DelayVariation: -1
ServiceType: 6
MaxSduSize: -1
MinimumPolicedSize: -1
===TX===
TokenRate: 4600
TokenBucketSize: -1
PeakBandwidth: -1
Latency: -1
DelayVariation: -1
ServiceType: 2
MaxSduSize: -1
MinimumPolicedSize: -1

And it returns success, but the DSCP bits in the packets are not being set. If we call SIO_GET_QOS afterwards we always get back the default:

SocketAddress bytes: <NULL>
===RX===
TokenRate: -1
TokenBucketSize: -1
PeakBandwidth: -1
Latency: -1
DelayVariation: -1
ServiceType: 1
MaxSduSize: -1
MinimumPolicedSize: -1
===TX===
TokenRate: -1
TokenBucketSize: -1
PeakBandwidth: -1
Latency: -1
DelayVariation: -1
ServiceType: 1
MaxSduSize: -1
MinimumPolicedSize: -1

Is there something different about the sockets implementation used by ASIO that prevents the  WSAIoctl() call from working correctly?

Dominique Lacerte
Senior Software Engineer
CounterPath Corporation

T  250.380.0584 x1368
M 250.595.1362

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