Date: Mon, 21 Jan 2013 13:33:17 +0200 From: Daniel Braniss <danny@cs.huji.ac.il> To: freebsd-stable@freebsd.org Cc: Ronald Klop <ronald-freebsd8@klop.yi.org> Subject: time issues and ZFS Message-ID: <E1TxFcr-0006dx-MX@kabab.cs.huji.ac.il>
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After many trials (and errors), here are some facts: host: DELL PowerEdge R710, 16GB, mfi0: <Dell PERC H700 Integrated> mfid0: 14305280MB (29297213440 sectors) RAID volume 'r5' is optimal mfi1: <Dell PERC 6> mfid1: 12393472MB (25381830656 sectors) RAID volume 'Virtual Disk 0' is optimal we have NO problems with FreeBSD-8.3-STABLE, but with 9.1-STABLE, the real-time clock slows down when doing some zfs stuff like send|receive, typing 'date' when less that 1000s went by seems to crorrect the problem, ntpd kicks in and on track again. I have a cron job just logging date every 5 minutes, and the loghost sees: |-- local time on loghost | time on problematic host Jan 20 19:56:19 store-02.cs.huji.ac.il Jan 20 19:56:19 danny: Sun Jan 20 19:56:19 IST 2013 -- ok Jan 20 20:15:00 store-02.cs.huji.ac.il Jan 20 20:15:00 danny: Sun Jan 20 20:15:00 IST 2013 -- ok Jan 20 21:30:00 store-02.cs.huji.ac.il Jan 20 20:21:06 danny: Sun Jan 20 20:21:06 IST 2013 -- off by 1:09 Jan 20 21:33:53 store-02.cs.huji.ac.il Jan 20 20:25:00 danny: Sun Jan 20 20:25:00 IST 2013 -- off by 1:08 Jan 20 21:38:54 store-02.cs.huji.ac.il Jan 20 20:30:00 danny: Sun Jan 20 20:30:00 IST 2013 -- off by 1:09 ... Jan 20 22:03:54 store-02.cs.huji.ac.il Jan 20 20:55:00 danny: Sun Jan 20 20:55:00 IST 2013 -- diff is now constant .. Jan 20 22:04:13 store-02.cs.huji.ac.il Jan 20 20:55:19 ntpd[1848]: time correction of 4134 seconds exceeds sanity limit (1000); set clock manually to the correct UTC time. ... Jan 20 22:58:53 store-02.cs.huji.ac.il Jan 20 21:50:00 danny: Sun Jan 20 21:50:00 IST 2013 strangely, when running 8.3, ACPI-fast is chosen: kern.timecounter.choice: TSC(-100) HPET(900) ACPI-fast(1000) i8254(0) dummy(-1000000) but with 9.1 TSC-low gets chosen: kern.timecounter.choice: TSC-low(1000) ACPI-fast(900) HPET(950) i8254(0) dummy(-1000000) so I did sysctl kern.timecounter.hardware=ACPI-fast, but the same happens - unless it can't be changed after boot. I realy need help here! thanks, danny
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