bhyve: Sync max {height,width} with pci_fbuf.c

[aokblast]

Summary

This allows vnc connect to a 4k resolution bhyve instance

[bz]

What's the expected bandwidth needed for that with VNC? 30Mbit/s?

[aokblast]

In D57063#1307650, @bz wrote:

What's the expected bandwidth needed for that with VNC? 30Mbit/s?

Some body mentioned the samething with me privately. The actual speed it needs is 30 * 60fps. I guess you want to tell me that it is impractical. I will switch it to 2k tomorrow instead of 4k. Thanks!

[bz]

In D57063#1307735, @aokblast wrote:

In D57063#1307650, @bz wrote:

What's the expected bandwidth needed for that with VNC? 30Mbit/s?

Some body mentioned the samething with me privately. The actual speed it needs is 30 * 60fps. I guess you want to tell me that it is impractical. I will switch it to 2k tomorrow instead of 4k. Thanks!

I think I had that discussion with @grehan a few years ago. Who's setting the fps? But even at 30fps it's just a lot. If we could do it on a posix local socket maybe...

The real answer is to use a protocol which can do good compression (or only transfer what changed) if we want a console window at 4K. We should really look into that one day as an alternative.
I am not even sure how much we could gain though in the mean time by implementing another encoding scheme? https://datatracker.ietf.org/doc/html/rfc6143#section-7.7