On Wed, Jan 24, 2007 at 03:20:53PM -0600, Paul Fulghum wrote: > In 2.6.16 the tty buffering pushes data to the line > discipline without regard to tty->receive_room. > If the line discipline can't keep up, the data gets dropped. > I observed this data loss at higher speeds when > placing the system under heavy load. > > 2.6.18 added code to respect tty->receive_room. > > This may or may not be your problem, but you should > be able to check by adding a conditional printk > to drivers/char/tty_io.c:flush_to_ldisc() > > If tty->receive_room is less than the size of the buffer > passed to disc->receive_buf() then you are losing data.
Sounds plausible. Certainly higher cpu load makes the problem occour more often, and making the system slower made it worse too. I will take a look at the tty_io.c in 2.6.18 and compare it against 2.6.16. -- Len Sorensen - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/