Timekeeping hosed by factor 3, high lapic interrupt rates
From: Jens Schweikhardt (schweikh_at_schweikhardt.net)
Date: Mon, 16 May 2005 13:34:20 +0200 To: email@example.com
the timekeeping on my CURRENT system as of May 15 is very strange. The
time as reported by date(1) increases too slow by a factor of 3. Things
with second intervals like sleep 1, tail -f, iostat 1, changing folders
in mutt all go slower by a factor of 3.
The system bios date however is correct, and a kernel as of March does
not have this problem, so it's clearly the kernel or some other software
problem. I have investigated a bit and found the interrupt rates for the
lapic being three times the value on the broken kernel (about 2kHz
schweikh@hal9000:~ $ vmstat -i # Good kernel
interrupt total rate
irq1: atkbd0 250 0
irq3: sio1 2 0
irq4: sio0 2 0
irq12: psm0 9079 25
irq13: npx0 1 0
irq14: ata0 84 0
irq15: ata1 77 0
irq18: em0 1091 3
irq24: ahd0 9112 25
irq25: ahc0 16 0
lapic0: timer 722947 1997 <-- ~6057 on a bad system
irq0: clk 361525 998
lapic1: timer 708251 1956 <-- dito
Total 1812437 5006 <-- greater than 12000
Maybe this gives someone a clue what goes on?
System is a supermicro P4SCT, 3GHz P4. Dmesg and kernel config upon request.
-- Jens Schweikhardt http://www.schweikhardt.net/ SIGSIG -- signature too long (core dumped) _______________________________________________ firstname.lastname@example.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "email@example.com"