Renesas Emulator Debugger M16C PC4701 - Manual (Page 32)

3.3.3 LAN communication 2
Please exexute registry setting program (Sack.exe) before starting the debugger. It is necessary for
LAN communication with emulators to set the following registry.
OS Key Data
Windows XP/2000 HKEY_LOCAL_MACHINE¥S
YSTEM¥CurrentControlSet¥
Services¥Tcpip¥Parameters¥
SackOpts 0(REG_DWORD)
You can clear the registry with executing the program "UnSack.exe". The above programs are
installed in the directory where this debugger is installed.
ATTENTION
Make sure Sack.exe and UnSack.exe is executed by one who is authorized as an Administrator. No
one but the user who has the authority of an Administrator can install the device driver.
Note
Windows XP/2000 TCP supports "Selective Acknowledgments (SACK)" as documented in RFC 2018.
SACK gives higher performance in the network which have high bandwidth and long round-trip
delays like satellite channels.
SACK support is enabled by default in Windows XP/2000. It is necessary for LAN communication
with emulators by Windows XP/2000 to disable SACK support. Setting the above registry can disable
SACK support.
Note that when you use the network which have high bandwidth and long round-trip delays like
satellite channels, the performance with SACK support disabled is lower than with enabled.
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