Hi, I have a GbE device that cannot forward the full 1Gbps rate for frames of odd-byte sizes, but can forward the full
1Gbps rate for frames of even-byte sizes. I hope to get other experts comments on this situation.I'm using IXIA traffic generator to test the GbE device. With the even-byte-sized frames (say, 64, 512), the device can receive full-rate traffic and forward back to IXIA. However, with the odd-byte-sized frames (say, 65, 511), the device can receive full-rate traffic, but fails to forward all the traffic back to IXIA. Overflow happens inside the device.
The nominal traffic generation speed for 511-byte frames can be calculated like the following; 1Gbps / (511 + 8 + 12) * 8 = 235,404.89642
And the IXIA's input rate is 235,405 frames/sec. The forwarding rate of the device is limited to 234,932 fps due to the overflow.
The device company claims that IXIA is generating too much traffic, that is, IXIA has a faster ineternal clock than the device clock. Is this valid claim or not?
Thanks for any comments.
Regards, Jay Kim