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PCIe Tuning Wizard Chapter 3, Getting Started with Xgig TraceControl
Xgig Analyzer User’s Guide 59
Control an IP Power switch
- (This is the best and preferred method.) This option controls an
IP Power switch over the LAN to power off/on the DUT. Once the DUT is on and the first
packet is seen on the PCIe bus, a capture is taken and the DUT is automatically powered off
again after 8 seconds (configurable). That technique allows powering on/off computers
without damaging the operating system as it is powered off before the operating system is
fully loaded. The wizard calls the batch files IPPowerOff.bat and IPPowerOn.bat to do this.
The files are accessible by clicking the
Edit .bat files…
button. By default, the files call into
IPPower9258.bat, which is capable of controlling an IP Power 9258 switch (cheap and widely
available). You need to specify the IP address, login information and port number used on the
IP Power switch. The switch uses DHCP and must be on the SAME SUBNET as the computer
where TraceControl runs. You must first download and run the ipedit.exe software (http://
www.aviosys.com/downloads.html) to discover the IP9258 switches on your network and
retrieve the IP address (you can also use an IP scanner if you run into troubles http://
angryip.org/download/#windows). When the IPPower9258.bat file is ready, double-click on
the IPPowerOff.bat and IPPowerOn.bat files to make sure they work. Once they work, you can
select this Auto-Reboot option in the “Tuning Options” panel and then hit the
Start Auto
Tuning
button.
Mixed IP power/remote reboot - This is a mix of the two prior options, so it requires you to
make both of them work before you can use this one. This is a last resort option if you find out
that repeated short 8 second captures used in “Control an IP Power switch” are not leading to
an error-free link.
Once you hit Start Auto Tuning , the wizard will perform from 10 to over 500 reboots overnight
until it finds error-free settings. Once it has found an error-free setting in an 8-second capture, it
will try a 2-minute capture error-free (if an IP Power switch is used, it tries 16 eight-second
error-free captures in a row instead). If the 2-minute capture(s) is not error free, then the wizard
continues and tries other settings. Once we have an error-free 2-minute capture, then the wizard
displays a pop-up dialog box requesting you to start packet traffic on the DUT.
The packet captures the run for two minutes after you clicked OK . 10,000 packets are required,
error-free, to declare success; otherwise, the wizard will try other settings again. Upon success, the
log shows the final grade and final EQ settings applied.
Figure 29: Successful Test Results
Then the wizard displays a final message that the Auto Tuning has completed.
Figure 30: Auto Tuning Completed Message
Note: Sometimes, while the wizard is busy writing the best settings to the interposer, a
“Server Busy” message indicating that the “action cannot be completed” may be displayed.
If this happens, just dismiss the message.