From owner-freebsd-stable@FreeBSD.ORG Mon Jan 21 14:37:49 2013 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id F0890AEB; Mon, 21 Jan 2013 14:37:49 +0000 (UTC) (envelope-from danny@cs.huji.ac.il) Received: from kabab.cs.huji.ac.il (kabab.cs.huji.ac.il [132.65.16.84]) by mx1.freebsd.org (Postfix) with ESMTP id 79CBA687; Mon, 21 Jan 2013 14:37:49 +0000 (UTC) Received: from pampa.cs.huji.ac.il ([132.65.80.32]) by kabab.cs.huji.ac.il with esmtp id 1TxIVP-000Bks-VH; Mon, 21 Jan 2013 16:37:48 +0200 X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.3 To: Adrian Chadd Subject: Re: time issues and ZFS In-reply-to: References: Comments: In-reply-to Adrian Chadd message dated "Mon, 21 Jan 2013 06:13:02 -0800." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Mon, 21 Jan 2013 16:37:47 +0200 From: Daniel Braniss Message-ID: Cc: freebsd-stable@freebsd.org X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jan 2013 14:37:50 -0000 > Hi, > > Try experimenting with kern.eventtimer.periodic and kern.eventtimer.idletick. > can you give/point to some info about this? btw, I just noticed that on this hardware I get: 9.1-STABLE: > vmstat -i interrupt total rate irq3: uart1 931 0 irq4: uart0 5 0 irq19: ehci0 1331 0 irq20: hpet0 uhci3 1687937 1163 irq21: uhci2 ehci1 29 0 irq23: atapci0 48 0 irq256: bce0 52270 36 irq260: mfi0 14690 10 irq261: mfi1 3088 2 Total 1760329 1213 no cpu timer, instead irq20: hpet0 uhci3, and when 8.3-STABLE: > vmstat -i interrupt total rate irq3: uart1 1048 0 irq4: uart0 5 0 irq19: ehci0 280451 1 irq21: uhci2 ehci1 29 0 irq23: atapci0 52 0 cpu0:timer 313544623 1125 irq256: bce0 30791673 110 irq260: mfi0 1372186 4 cpu1:timer 1294093 4 ... total 384382790 1380 is this OK? > If this fixes it for you, please file a PR with all the relevant details. > I will! > Thanks! > > > > > Adrian > > > On 21 January 2013 03:33, Daniel Braniss wrote: > > After many trials (and errors), here are some facts: > > > > host: DELL PowerEdge R710, 16GB, > > mfi0: > > mfid0: 14305280MB (29297213440 sectors) RAID volume 'r5' is optimal > > mfi1: > > 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 > > > > > > > > _______________________________________________ > > freebsd-stable@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"