Date: Mon, 21 Jan 2013 08:03:08 -0700 From: Ian Lepore <ian@FreeBSD.org> To: Daniel Braniss <danny@cs.huji.ac.il> Cc: freebsd-stable@FreeBSD.org, Ronald Klop <ronald-freebsd8@klop.yi.org> Subject: Re: time issues and ZFS Message-ID: <1358780588.32417.414.camel@revolution.hippie.lan> In-Reply-To: <E1TxFcr-0006dx-MX@kabab.cs.huji.ac.il> References: <E1TxFcr-0006dx-MX@kabab.cs.huji.ac.il>
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On Mon, 2013-01-21 at 13:33 +0200, Daniel Braniss wrote: > 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 What's the output of sysctl kern.eventtimer? Does the bad behavior change if you set kern.eventimer.periodic=1? -- Ian
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