Kernel spits out lot of these Jun 18 05:14:47 pommi /kernel: sio1: 119 more interrupt-level buffer over flows (total 3642) Jun 18 05:14:47 pommi /kernel: sio1: 119 more interrupt-level buffer overflows ( total 3642) It also very easily reboots when lots of PPP load exits. Low tcp performance hints that it is loosing lots of data. Fix: I think this feature has already been discussed; grepping 'interrupt-level' from FAQ's didn't help. If this is a feature which can be worked around, this might be a doc-bug? However, I find it curous how a 386-16 could be too slow to respond for a 38400 bps link? How-To-Repeat: Use FreeBSD as a router for a PPP connection on a slow machine.
State Changed From-To: open->closed fixed setting 'options RS_IBUFSIZE=1024', with appropriate modifications made to sio.c to allow for this
State Changed From-To: closed->open incomplete analysis of solution/workaround
Responsible Changed From-To: freebsd-bugs->bde sio.c is Bruce's responsibility
State Changed From-To: open->closed duplicated in PR#kern/579, and describes workaround