joe mcguckin wrote: > > I seem to remember that Sun was trying to sell boxes to the airline / > reservation industry, and one of the ways they came up with to make > Solaris handle thousands of ascii terminals was to push the character > discipline code into streams in order to eliminate the multiple > user/kernel crossings per character being handled… I encountered this feature when deploying some new Solaris 2.5.1 / 2.6 web servers in about 1997/8. We were chroot()ing the user login daemons (telnet and ftp) to improve security, and they wouldn't work on a freshly rebooted server. Eventually I worked out that telnetd loaded a kernel module on demand, and this didn't work when it was chroot()ed, but telnetd could skip it if the module had previously been loaded. (I could see from truss and/or strings that telnetd was specifying an absolute path to the module rather than expecting the kernel to know where to find it.) I was kind of impressed by the performance engineering, and it stuck in my memory because it took me so long to understand why it sometimes didn't work... Tony. -- f.anthony.n.finch http://dotat.at/ Trafalgar: Variable 3 or 4 at first in southeast, otherwise cyclonic 5 to 7. Moderate or rough, occasionally very rough at first in northwest. Rain or thundery showers. Good, occasionally poor.