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Date: Mon, 9 Dec 1996 14:19:33 +1100
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199612090319.OAA12973@godzilla.zeta.org.au>
To: hackers@freebsd.org, proff@suburbia.net
Subject: Re: strange problems with recent current
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>Dec  8 02:37:59 evil /kernel: cy15: 5 more silo overflows (total 3876)
>Dec  8 02:38:00 evil /kernel: cy8: 1 more silo overflow (total 7)
>...
>This has crept in sometime during the past few days.

On what hardware?  The PCI cy driver doesn't use a "fast" interrupt
handler yet, so silo overflows are quite likely for it.  E.g., updating
the keyboard LEDs takes a few msec, so a few fifos full of input may
be dropped on each port whenever you hit caps lock (the fifo fills up
in 1 msec at 115200 bps).

>Previously cy.c
>would suffer silo overflows far more rarely (once every 10-30 seconds
>on average) and overflows quantities were never over 2 or 3.

One per day is too many.

>Response time generally has suffered, even with a very low load. Feels
>like some kind of excessive context switching delay.

I haven't noticed any new problems here on a lightly loaded 486/33 system.

Bruce