From owner-freebsd-questions@freebsd.org Tue Aug 16 11:33:59 2016 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 6904DBBC461 for ; Tue, 16 Aug 2016 11:33:59 +0000 (UTC) (envelope-from matthew@FreeBSD.org) Received: from smtp.infracaninophile.co.uk (smtp.infracaninophile.co.uk [81.2.117.100]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "smtp.infracaninophile.co.uk", Issuer "infracaninophile.co.uk" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id EB93F11F6 for ; Tue, 16 Aug 2016 11:33:58 +0000 (UTC) (envelope-from matthew@FreeBSD.org) Received: from 53.101.240.10.in-addr.arpa.private.cam.ac.uk (global-5-13.nat-1.net.cam.ac.uk [131.111.5.13]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: m.seaman@infracaninophile.co.uk) by smtp.infracaninophile.co.uk (Postfix) with ESMTPSA id C7B1B7C11; Tue, 16 Aug 2016 11:33:53 +0000 (UTC) Authentication-Results: smtp.infracaninophile.co.uk; dmarc=none header.from=FreeBSD.org Authentication-Results: smtp.infracaninophile.co.uk/C7B1B7C11; dkim=none; dkim-atps=neutral Subject: Re: Losing time like crazy (1s short per 10s) - how to investigate? To: freebsd-questions@freebsd.org, "Martin S. Weber" References: <20160816112002.GA3083@hephaistos.local> <20160816112714.GA1241@hephaistos.local> From: Matthew Seaman Message-ID: Date: Tue, 16 Aug 2016 12:33:47 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 MIME-Version: 1.0 In-Reply-To: <20160816112714.GA1241@hephaistos.local> Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="bXENMT2o9lGNxXPTGlr1pXaUaG34S1jKp" X-Spam-Status: No, score=2.3 required=5.0 tests=BAYES_00, HELO_DYNAMIC_SPLIT_IP, SPF_SOFTFAIL, TVD_RCVD_IP, T_SPF_HELO_TEMPERROR autolearn=no autolearn_force=no version=3.4.1 X-Spam-Level: ** X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on smtp.infracaninophile.co.uk X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 Aug 2016 11:33:59 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --bXENMT2o9lGNxXPTGlr1pXaUaG34S1jKp Content-Type: multipart/mixed; boundary="sNb0xwHHgpquHMd7E9OL8rv8WXd4GcQT9" From: Matthew Seaman To: freebsd-questions@freebsd.org, "Martin S. Weber" Message-ID: Subject: Re: Losing time like crazy (1s short per 10s) - how to investigate? References: <20160816112002.GA3083@hephaistos.local> <20160816112714.GA1241@hephaistos.local> In-Reply-To: <20160816112714.GA1241@hephaistos.local> --sNb0xwHHgpquHMd7E9OL8rv8WXd4GcQT9 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 16/08/2016 12:27, Martin S. Weber wrote: > On 2016-08-16 13:20:02, Martin S. Weber wrote: >> > This is on FreeBSD 10.3-RELEASE-p7. I've only noticed this today, >> > so I'd suspect this is post the p7 update (although I haven't >> > investigated in that direction yet). I'm losing roughly a second >> > per 10 seconds wall time. Look at this crazy guy: >> >=20 >> > # ntpd -q ; sleep 10; ntpd -q = =20 >> > 16 Aug 13:12:52 ntpd[48425]: ntpd 4.2.8p8-a (1): Starting >> > (...) >> > 16 Aug 13:12:54 ntpd[48425]: ntpd: time set +0.891676 s >> > ntpd: time set +0.891676s >> > 16 Aug 13:13:04 ntpd[48426]: ntpd 4.2.8p8-a (1): Starting >> > (...) >> > 16 Aug 13:13:06 ntpd[48426]: ntpd: time set +1.218972 s >> > ntpd: time set +1.218972s >> >=20 >> > This is a CRAZY amount of skew. I've never noticed this before -- >> > (...) > Note, with (kernel) p4 (userland) p6 (I freebsd-update'd rollback)=20 > this does not happen: Could you open a PR with the information you've included in this mail thread please? That sort of timing instability really shouldn't occur as a consequence of a system upgrade. It does seem to be peculiar to your hardware though -- if everyone was seeing that there would be ructions. Big ructions. Cheers, Matthew --sNb0xwHHgpquHMd7E9OL8rv8WXd4GcQT9-- --bXENMT2o9lGNxXPTGlr1pXaUaG34S1jKp Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQJ8BAEBCgBmBQJXsvohXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQ2NTNBNjhCOTEzQTRFNkNGM0UxRTEzMjZC QjIzQUY1MThFMUE0MDEzAAoJELsjr1GOGkATrUYQAIdO4Lej1SE2H+T5SwGsV5tc RACcKtZKOWL2WyZlbX2bkBMvyIettdiDfGBOw5oUK6luaCx0BddKeY7yauT6iUBM HUgK1SEwSChFLR4IUbh+hH3rn6iwJ8gvqW8KFmBINvgMhjtyoP25md2tZ72k1QZB 6R5aU+fN0p0TUaubikaQmmWG56xuZ853TS+ko4Z30S5LlvRhF2uDpAt93bdMoTld LJflYGoh0GyioWN2xBkl9S1ShzYNIj9B0hgt/Qt581+2x2Tp5B9JOicFoJpSGn8g ybrcvCnxsDBVToWRByxYOerMGFIAj1VArw3xQoeZAwcQkvBTNNNBNWCI9fuPVW2e DNhq8TV2He8Li6dJbdHOmdvpoiq82k+uwA48PisHBN51zgrnnxE7ADHmdeT8CaS+ JSAj879ZAEqAMXUqyfPHZJW0f+Jg/Hl+xog6X8Mq750KyF1OakGJgk4uo+q3Prtn s/PpMhP+jC006xYsTfseHLqr5zN3ZQ/bKZkVm2IeRARuBxRry/svur0p2FmCmiF/ aGOLTBFcXtTIXVwKAfmBCcQ+CaHZ2SjUcCPTBm5RnOpK2fykkswGkIM6Q+6lvuzp K1VR2DoakrNZTqSjT/rp8DlRBCdnZ4dlsg+EGblI64xqfcNcnx6dqbBPx403txlW zT68PzaVHBiApZrqcodB =OAao -----END PGP SIGNATURE----- --bXENMT2o9lGNxXPTGlr1pXaUaG34S1jKp--