Date: Sat, 8 Nov 2008 20:40:39 +0000 (UTC) From: Ed Schouten <ed@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/dev/syscons sysmouse.c src/sys/kern tty.c src/sys/sys ttydefaults.h Message-ID: <200811082042.mA8KgIcs011963@repoman.freebsd.org>
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ed 2008-11-08 20:40:39 UTC
FreeBSD src repository
Modified files:
sys/dev/syscons sysmouse.c
sys/kern tty.c
sys/sys ttydefaults.h
Log:
SVN rev 184771 on 2008-11-08 20:40:39Z by ed
Reduce the default baud rate of PTY's to 9600.
On RELENG_6 (and probably RELENG_7) we see our syscons windows and
pseudo-terminals have the following buffer sizes:
| LINE RAW CAN OUT IHIWT ILOWT OHWT LWT COL STATE SESS PGID DISC
| ttyv0 0 0 0 7680 6720 2052 256 7 OCcl 1146 1146 term
| ttyp0 0 0 0 7680 6720 1296 256 0 OCc 82033 82033 term
These buffer sizes make no sense, because we often have much more output
than input, but I guess having higher input buffer sizes improves
guarantees of the system.
On MPSAFE TTY I just sent both the input and output buffer sizes to 7
KB, which is pretty big on a standard FreeBSD install with 8 syscons
windows and some PTY's. Reduce the baud rate to 9600 baud, which means
we now have the following buffer sizes:
| LINE INQ CAN LIN LOW OUTQ USE LOW COL SESS PGID STATE
| ttyv0 1920 0 0 192 1984 0 199 7 2401 2401 Oil
| pts/0 1920 0 0 192 1984 0 199 5631 1305 2526 Oi
This is a lot smaller, but for pseudo-devices this should be good
enough. You need to do a lot of punching to fill up a 7.5 KB input
buffer. If it turns out things don't work out this way, we'll just
switch to 19200 baud.
Revision Changes Path
1.33 +1 -1 src/sys/dev/syscons/sysmouse.c
1.298 +1 -1 src/sys/kern/tty.c
1.22 +0 -1 src/sys/sys/ttydefaults.h
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