The Xillybus Forum

Hello Eli

Your blog has been very helpful to me.

I had a requirement of transferring some data between a Host and EP PCIe devices. I wanted to know if there is any way I could transfer this over a low latency, high priority channel over PCIe ?

Thanks

Hi,

The immediate answer that comes to mind is Virtual Channels. That gives your packets a separate flow control, so if there's a traffic jam with other communication, your packets still run through.

But I should mention that it looks like this feature doesn't get very popular, most likely because there are no traffic jams. So the question is how low your latency needs to be, and what problems you have achieving it. It's probably much easier to solve this by improving the switching infrastructure (higher bandwidth).

Eli