From owner-freebsd-bugs Sat May 8 3: 0: 6 1999 Delivered-To: freebsd-bugs@freebsd.org Received: from freefall.freebsd.org (freefall.FreeBSD.ORG [204.216.27.21]) by hub.freebsd.org (Postfix) with ESMTP id EB91E1563B for ; Sat, 8 May 1999 03:00:01 -0700 (PDT) (envelope-from gnats@FreeBSD.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.9.3/8.9.2) id DAA61193; Sat, 8 May 1999 03:00:01 -0700 (PDT) (envelope-from gnats@FreeBSD.org) Received: from wkt.slip.adfa.edu.au (wkt.slip.adfa.edu.au [131.236.2.210]) by hub.freebsd.org (Postfix) with ESMTP id 6E9AC15256 for ; Sat, 8 May 1999 02:54:50 -0700 (PDT) (envelope-from mhol@wkt.slip.adfa.edu.au) Received: (from mhol@localhost) by wkt.slip.adfa.edu.au (8.9.2/8.9.2) id TAA01225; Sat, 8 May 1999 19:56:38 +1000 (EST) (envelope-from mhol) Message-Id: <199905080956.TAA01225@wkt.slip.adfa.edu.au> Date: Sat, 8 May 1999 19:56:38 +1000 (EST) From: mhol@wkt.slip.adfa.edu.au (Warren Toomey) Reply-To: wkt@cs.adfa.edu.au (Warren Toomey) To: FreeBSD-gnats-submit@freebsd.org X-Send-Pr-Version: 3.2 Subject: i386/11575: sio.c silo overflows during X usage Sender: owner-freebsd-bugs@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org >Number: 11575 >Category: i386 >Synopsis: sio.c silo overflows during X usage >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sat May 8 03:00:01 PDT 1999 >Closed-Date: >Last-Modified: >Originator: Warren Toomey >Release: FreeBSD 3.1-STABLE i386 >Organization: Personal >Environment: FreeBSD 3.1-STABLE kernel, Pentium II 266 with 64M, XFree86 3.3.3.1 sio0 at 0x3f8-0x3ff irq 4 flags 0x10 on isa sio0: type 16550A sio1 at 0x2f8-0x2ff irq 3 on isa sio1: type 16550A /sys/i386/isa/sio.c 1.224.2.5 1999/04/13 18:54:43 jhay Kernel ppp running on sio1 (i.e /dev/ttyd1) at 38400bps, connected to a 33K external modem. stty flags were: ppp disc; speed 38400 baud; 0 rows; 0 columns; lflags: -icanon -isig -iexten -echo -echoe -echok -echoke -echonl -echoctl -echoprt -altwerase -noflsh -tostop -flusho -pendin -nokerninfo -extproc iflags: -istrip -icrnl -inlcr -igncr -ixon -ixoff -ixany -imaxbel ignbrk -brkint -inpck ignpar -parmrk oflags: -opost -onlcr -oxtabs cflags: cread cs8 -parenb -parodd hupcl -clocal -cstopb crtscts -dsrflow -dtrflow -mdmbuf cchars: discard = ^O; dsusp = ^Y; eof = ^D; eol = ; eol2 = ; erase = ^?; intr = ^C; kill = ^U; lnext = ^V; min = 1; quit = ^\; reprint = ^R; start = ^Q; status = ^T; stop = ^S; susp = ^Z; time = 0; werase = ^W; At time of problem, the following processes were running PID TT STAT TIME COMMAND 0 ?? DLs 0:00.00 (swapper) 1 ?? Ss 0:00.01 /sbin/init -- 2 ?? DL 0:00.00 (pagedaemon) 3 ?? DL 0:00.00 (vmdaemon) 4 ?? DL 0:00.27 (syncer) 108 ?? Is 0:02.00 syslogd 233 ?? R 2:03.86 /usr/X11R6/bin/Xwrapper :0 (XF86_SVGA) 259 ?? Ss 0:00.20 moused -p /dev/cuaa0 -t mousesystems 313 ?? Is 0:00.01 pppd 254 p0 Ss 0:00.23 -csh (tcsh) 415 p0 R+ 0:00.00 ps -ax 253 p1 Is+ 0:00.12 -tcsh (tcsh) 225 v0 Is+ 0:00.11 /bin/sh /usr/X11R6/bin/startx 232 v0 I+ 0:00.04 xinit /usr/home/mhol/.xinitrc -- 239 v0 S 0:00.26 fvwm 248 v0 S 0:00.33 xterm -e tcsh 249 v0 S 0:00.50 xterm -C 226 v1 Is+ 0:00.01 /usr/libexec/getty Pc ttyv1 227 v2 Is+ 0:00.01 /usr/libexec/getty Pc ttyv2 >Description: Serial port silo overflows occur on sio1 (i.e /dev/ttyd1), using kernel ppp, when there is heavy X display activity. When X is not running, or when little X activity is occurring, no silo overflows occur. In fact, with X quiescent, and the system load >8 (due to several while(1) ; processes) there are no silo overflows. When windows are moved around, scrolling is done within a text window, of when x11perf -all is running, silo overflows go from none at all to several per second. There is no other system activity (no disk activity, no mouse activity, no incoming LAN packets, no other I/O activity). Although I generally use natd, this was also disabled during the test. >How-To-Repeat: Start X windows. Start kernel-mode ppp to an ISP, using an external 33K modem. Once connected, begin a large ftp download which you know will saturate the link. Note the complete lack of silo overflows. Begin to perform heavy text scrolling within an xterm window (e.g du -a /usr), or run x11perf -all. Note several silo overflows per second, which causes chronic stalls in the FTP transfer, and severe incoming packet losses. >Fix: No fix known at this time. I notice that /sys/i386/isa/sio.c has been moved to /sys/isa/sio.c in -CURRENT, and at least one revision mentions silo overflows (1.225). However, I am unable to merge this change into my 3.1-STABLE /sys/i386/isa/sio.c >Release-Note: >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message