16 Jul
2021
16 Jul
'21
3:56 p.m.
On Fri, Jul 16, 2021 at 09:00:58AM -0400, Theodore Y. Ts'o wrote:
The trick that I used was two have two "flip
buffers" which were
dedicated for each serial port. One buffer would be filled by the
interrupt handler, while the other would be buffer would be processed
by the bottom half (read: software interrupt) handler. When the
bottom half handler had emptied one buffer, it would check to see if
there were any characters in the other buffer, and if so, flip the two
and process the characters in that buffer.
I'm pretty sure SGI used a similar approach for networking packets.