Date: Mon, 13 May 1996 12:56:35 +1000 From: Bruce Evans <bde@zeta.org.au> To: coredump@nervosa.com, freebsd-bugs@freebsd.org, mrm@Mole.ORG Cc: jkh@time.cdrom.com Subject: Re: List of open Problem Reports Message-ID: <199605130256.MAA26611@godzilla.zeta.org.au>
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>> > [1995/06/17] kern/528 slow 386 reports excessive interrupt-level buffer ov >> >> Isn't this natural for a slow 386? >Possibly, but it also happens with a 486DX4/120, 2.1.0R, 16550AFN, kernel ppp, >296 mtu or 1500 mtu. Running the vmdaemon process entirely at splhigh() would have caused it. Interrupts were sometimes masked for 60ms on a P133, but the interrupt-level sio buffers are "only" large enough for 22ms worth of input at 115200 bps. This bug lived from 1994/11/25 to 1996/04/11 so it affected all releases except 2.0. Overruns will occur if softtty interrupts are blocked or prempted for longer than 22ms. This is most likely for slow systems connected to fast (concurrently) active device(s) through slow polled interfaces. Bruce
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