Date: Thu, 30 May 1996 15:38:23 -0400 From: Thomas David Rivers <ponds!rivers@dg-rtp.dg.com> To: coredump@nervosa.com, zeta.org.au!bde@dg-rtp.dg.com, freebsd-bugs@freebsd.org, mrm@marmot.Mole.ORG Cc: jkh@time.cdrom.com Subject: Re: List of open Problem Reports Message-ID: <199605301938.PAA03771@lakes>
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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 > Can the corrected vmdaemon (possibly) be used in 2.1? If so, can someone point me to the diff's and I'll report back... - Dave Rivers -
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