Date: Mon, 16 May 2005 13:34:20 +0200 From: Jens Schweikhardt <schweikh@schweikhardt.net> To: freebsd-current@freebsd.org Subject: Timekeeping hosed by factor 3, high lapic[01] interrupt rates Message-ID: <20050516113420.GA786@schweikhardt.net>
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hello, world\n 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[01] being three times the value on the broken kernel (about 2kHz vs 6kHz), 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. Regards, Jens -- Jens Schweikhardt http://www.schweikhardt.net/ SIGSIG -- signature too long (core dumped)
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