Hi,
We encounter an issue with UDP buffer size on a Windows 2003 + gigabyte
Ethernet network card. We detect it because we can't use Tibco
RendezVous over 500 Mb/s of bandwith under Windows 2003 (as it works
fine under Linux - up to 1 Gb/s).
After several investigations (hardware related) , it seems that we
can't send an UDP packet greater than 65 K despite following all KB
notes (or Windows Internal books).
HKLM\System\CurrentControlSet\Services\AFD\Paramet ers
=> DefaultReceiveWindow 0x001fffe0
=> DefaultSendWindow 0x001fffe0
=> LargeBufferListDepth 0x0a
=> LargeBufferSize 0x001fffe0
HKLM\System\CurrentControlSet\Services\TcpIp\Param eters
=> GlobalMaxTcpWindowSize 0x001fffe0
=> TcpWindowSize 0x001fffe0
=> Tcp1323Opts 3
We try to change all of theses settings, result is still the same
(Tibco is limited to 500 Mb of bandwith).
I also noticed huge number of Output Queue Length in PerfCounters (peak
up to 40).
So I used TracePlusWinsock to trace Winsock calls coming from rvd.exe,
SO_SNDBUF seems not setted . So following NDIS 5.1 specifications or MS
TCP/IP Implementation in 2K3 , socket must be created with default
parameter (setted in registry). MS Premium Support reply that the UDP
buffer is not configurable at the system level, and grows and shrinks
dynamically, a buffer can be set at the application level by using the
Winsock API. Tibco Support reply that they force a 1M buffer size in
their Win32 code ...
But with PCATTCP.exe (classic TCP/UDP benchmarking tool ), we also
reproduce an issue :
Sender : PCATTCP.exe -t -l 800000 -u -v -f M -p 7501 ReceiverComputer
Receiver : PCATTCP.exe -r -l 100000 -u -c -p 7501
Results :
PCAUSA Test TCP Utility V2.01.01.08
UDP Transmit Test
Transmit : UDP -> 184.63.61.212:7501
Buffer Size : 100000; Alignment: 16384/0
Send Mode : Send Pattern; Number of Buffers: 2048
Statistics : UDP -> 184.63.61.212:7501
0 bytes in 0.00 real seconds = -1.#J MB/sec +++
numCalls: 3; msec/call: 0.00; calls/sec: 1.#J
OS : Windows 2003 (without SP1)
Broadcom NetXtreme Gigabit Ethernet , driver b57xp32.sys v 8.48.0.0.
last version available (WHC Certified).
My questions are :
- Does anyone here use Tibco RendezVous (rvd) under Windows 2K3 +
Gigabyte network card ? If yes , do you use all your bandwith or are
you limited to 500 Mb/s (like us) ?
- Is it possible that Miniport driver (WHC !!) force a default value
for UDP buffer size to AFD.SYS ? Could explain peak on Output Queue
Length...
- Do you have any other ideas / explanation ?
Best regards
Pierre-Olivier BLU-MOCAER
Technical Account Manager - Windows Server Team
SGCIB - Societe Generale Investment Banking
|
Similar Threads
Linear Mode
