Date: Mon, 9 Dec 1996 14:19:33 +1100 From: Bruce Evans <bde@zeta.org.au> To: hackers@freebsd.org, proff@suburbia.net Subject: Re: strange problems with recent current Message-ID: <199612090319.OAA12973@godzilla.zeta.org.au>
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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
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