On Fri, Mar 22, 2019 at 6:56 PM Willard Goosey <goo...@sdc.org> wrote:
> > It's basically bufferbloat on the other side. The PC/Mac/whatev recieves > an XOFF and sticks it in a large recieve buffer and goes on with blasting > bytes at the M100. By the time it gets around to actually *processing* the > XOFF it's already overrun the M100's buffer. :-( > > Faster serial transfers work best with things like old DOS term programs > that don't know about 16650 FIFOs. ;-) > > I never had any trouble with Procomm under msdos on a 386. Minicom under > Linux is nothing but trouble! > > My experience is the same. I've found it to be Linux specific. That's why hardware flow control, or inserting some delays is the only way to avoid overrun. Also the USB-Serial drivers add some buffering so that's another variable. Windows doesn't seem to have the problem based on most reports. I think the fix would be for Linux to read ahead in its buffers for XOFF character to see if it needs to flow-off. But I doubt the maintainer will fix. At some point it was Alan Cox. I don't think there's any way to fix this outside the kernel. -- John.
