From owner-freebsd-cloud@freebsd.org Sat Mar 25 21:21:18 2017 Return-Path: Delivered-To: freebsd-cloud@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 06B4DD1D099 for ; Sat, 25 Mar 2017 21:21:18 +0000 (UTC) (envelope-from newt0311@gmail.com) Received: from mail-oi0-x236.google.com (mail-oi0-x236.google.com [IPv6:2607:f8b0:4003:c06::236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id D8F99955 for ; Sat, 25 Mar 2017 21:21:17 +0000 (UTC) (envelope-from newt0311@gmail.com) Received: by mail-oi0-x236.google.com with SMTP id r203so8968991oib.3 for ; Sat, 25 Mar 2017 14:21:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=L8MOkXae9dHo8KPGYlphrYJzgOXVPdlcOnL90TLyA5s=; b=PNTyLQjMB7eOcW/xS7ezOX7kmFkjNWIIQ0h1Jb5br3RxRQ9pRf7E2nVUBH43d5GC2M 6WvVJyFktOJJlXn1X/2depVCd00koIUDgC5NPzpzIRM069t7sHuvZWt3nsf4nWdGSZTk odNfIVbT3KxZ2hjpCPdJ6PQWhlLZd+IUVeFkMifinyt93mQbbkRqXSYmvxYAgb71i2Uq nVvvKQQuskCNo7DMt8sY/oKUBWIYWA9/NZ0BGamg1bQjLL8VQjXm2bDL/IzXtRoUiM+d 1oDrLrYEmxQCZceBdXZM8mCUACr1nxT/6RW9BQMurb7KyNzxnHRSAsOK/Fpjvop/fsx7 djEg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=L8MOkXae9dHo8KPGYlphrYJzgOXVPdlcOnL90TLyA5s=; b=QxlRXa3TBiLsBlYm6mtmgYoDuGs2GWVZGegGSbNw+j4JxsdJ9dRx2lTLKECE78lHPn ig7i4XjwFENzGdqIIEvuXyZD7rF0KoY5NdFDIragdE+gY4KJipgheDCfq0t5YMmbvpDB ZcUDIZ66o3vLlRx/rSkZg7ivarvpP8T6Xau0I7S6Gt1aiBJ+vxLMwx41K88ykEU08VpO Y71hXCpLF5zd7JdtxjBUgZlczDbmq74X37JVMjHDIy2liSaJdxaS9YOfM1VMqnmPrIF1 LcHnCUDm7TA2qfm8I6HDdI69AHAkQVVmp0PFU33lZIdZO7DOKofRH7nh9xV6PcYm+hId M+dA== X-Gm-Message-State: AFeK/H0rZsvz9wnbppCO/nRCOLsCHAbbHDSmPdl4TaYcU1SXTMq7FnbNnPmjLstlAlEWSOM6z9c4PjpeeiovFw== X-Received: by 10.202.227.69 with SMTP id a66mr8107141oih.115.1490476876729; Sat, 25 Mar 2017 14:21:16 -0700 (PDT) MIME-Version: 1.0 Received: by 10.157.22.217 with HTTP; Sat, 25 Mar 2017 14:20:56 -0700 (PDT) From: Prakhar Goel Date: Sat, 25 Mar 2017 17:20:56 -0400 Message-ID: Subject: Issues with clock skew on GCE To: freebsd-cloud@freebsd.org Content-Type: text/plain; charset=UTF-8 X-BeenThere: freebsd-cloud@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "FreeBSD on cloud platforms \(EC2, GCE, Azure, etc.\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 25 Mar 2017 21:21:18 -0000 Hello All, Has anybody noticed clock skew on g1-small instances? I have two and both show substantial clock skew (as much as several days after only a few days running). The n1 etc... instances I have seem to be fine so perhaps this is limited to the shared cpu instances only? Thanks. -- ________________________ Warm Regards Prakhar Goel From owner-freebsd-cloud@freebsd.org Sat Mar 25 21:28:44 2017 Return-Path: Delivered-To: freebsd-cloud@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 A9D0FD1D491 for ; Sat, 25 Mar 2017 21:28:44 +0000 (UTC) (envelope-from 0100015b075ef9bf-ec150480-31c3-41a7-b6e2-8378e43acc61-000000@amazonses.com) Received: from a8-176.smtp-out.amazonses.com (a8-176.smtp-out.amazonses.com [54.240.8.176]) (using TLSv1 with cipher ECDHE-RSA-AES128-SHA (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 6DD1EE4C for ; Sat, 25 Mar 2017 21:28:44 +0000 (UTC) (envelope-from 0100015b075ef9bf-ec150480-31c3-41a7-b6e2-8378e43acc61-000000@amazonses.com) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=ae7m2yrxjw65l2cqdpjxuucyrvy564tn; d=tarsnap.com; t=1490477316; h=Subject:To:References:From:Message-ID:Date:MIME-Version:In-Reply-To:Content-Type:Content-Transfer-Encoding; bh=aIk9N6CcYAz/44FBmbkC95h9CgvE3q9NRTiUOt4NCrw=; b=IseAhYHn4tsDibr0ZWWbQJQf7aftiTiqOBQtTYhrcN2pHrMXrmywxR6JRQWGhVGp rwrAHOnaT8radnBqqy0R2nxrWOCGGQReco1ypStNDolYPJp6g/xfjQRYbxM6aX+diMA oIW1S709AY7FssyZXAfA7PkvcZtENS2MRu283AQ0= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=224i4yxa5dv7c2xz3womw6peuasteono; d=amazonses.com; t=1490477316; h=Subject:To:References:From:Message-ID:Date:MIME-Version:In-Reply-To:Content-Type:Content-Transfer-Encoding:Feedback-ID; bh=aIk9N6CcYAz/44FBmbkC95h9CgvE3q9NRTiUOt4NCrw=; b=a+Ax0Z6o4DZKMZuxxeKfIeSkIZIGMqNc7nXCWIjmfGA8Xy1k7HiMA2Vj5Xc/5OAS 1xjzemzWoKQO/NTI7FXGRMRuoClZt2LwY/hpvtv8+hCfDppaGDW3CAuiwh1ZovsmiE+ cmlsXUX5KF1iM2c8BQmfOuKQTd7OS+p/2TUZ+A60= Subject: Re: Issues with clock skew on GCE To: Prakhar Goel , freebsd-cloud@freebsd.org References: From: Colin Percival Message-ID: <0100015b075ef9bf-ec150480-31c3-41a7-b6e2-8378e43acc61-000000@email.amazonses.com> Date: Sat, 25 Mar 2017 21:28:36 +0000 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-SES-Outgoing: 2017.03.25-54.240.8.176 Feedback-ID: 1.us-east-1.Lv9FVjaNvvR5llaqfLoOVbo2VxOELl7cjN0AOyXnPlk=:AmazonSES X-BeenThere: freebsd-cloud@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "FreeBSD on cloud platforms \(EC2, GCE, Azure, etc.\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 25 Mar 2017 21:28:44 -0000 On 03/25/17 14:20, Prakhar Goel wrote: > Has anybody noticed clock skew on g1-small instances? I have two and > both show substantial clock skew (as much as several days after only a > few days running). The n1 etc... instances I have seem to be fine so > perhaps this is limited to the shared cpu instances only? I'm an EC2 guy rather than a GCE guy, but I'd suggest looking at the kern.timecounter sysctl. Clock skew on virtual systems is something easily seen as a result of TSC fiddling. -- Colin Percival Security Officer Emeritus, FreeBSD | The power to serve Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid From owner-freebsd-cloud@freebsd.org Sat Mar 25 21:59:00 2017 Return-Path: Delivered-To: freebsd-cloud@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 B9279D1DCF2 for ; Sat, 25 Mar 2017 21:59:00 +0000 (UTC) (envelope-from newt0311@gmail.com) Received: from mail-oi0-x22b.google.com (mail-oi0-x22b.google.com [IPv6:2607:f8b0:4003:c06::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 82DDA1E05 for ; Sat, 25 Mar 2017 21:59:00 +0000 (UTC) (envelope-from newt0311@gmail.com) Received: by mail-oi0-x22b.google.com with SMTP id r203so9126703oib.3 for ; Sat, 25 Mar 2017 14:59:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=DuJM3rRYIvJXdEpjThg2XdyHUIzf+X2ivLxDPwDz0aY=; b=mXU5Y1C0C72NppFENUbmuU/b/Lsfok4IUNKxaLBExlnSywFo2SIYWvKh2inV0NgSMD 8uS8xq0MdTA1PJI+LykkgLAPy2G5zveuE24uVoVSX6GT5x1CQeFXAhfCPr3IIEj5a7s7 O0StXA2sk1+jO9c9z+9DEyFLkgQJDM5MB3gdXUWEeZBAeNKX/29SNgmSSFAau5DPYfG6 mo5sorfxhFIuFYqnHqu4G11CPXib51OQfRg4WkX+1tFSuiW4ka83W7mId39O46I5TBHE NQbasQnPko0lFuhJPI2mZE6UrQQfE4XElgHDCA+6MypMqtFnzWbr2IfT2xCrTV6/Bv56 B3Iw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=DuJM3rRYIvJXdEpjThg2XdyHUIzf+X2ivLxDPwDz0aY=; b=nDk7F1rq6CMr69nugS+p4xzRhOz9hgfoNzUgE/pXCEsUuUue3IW+w6NzkVkqw47On8 kE+CmjSnCDG/+W5lbzrExu54FzMakeqRI20WSqg9alBpQFxKMLMVGL/dh4wfSmGZHi3D i4M464lITqZhjHAIqHVy7F5ZgCtoZcj306OV90GRbglhFcMr+y4t0VNMvReLgTmdZ4AY efOhQYoUvLCv16y2/6DpErHoG3AR9lP1VIBQvUiBzZifmcMEjn4LAbE70Cc7h89bKmHT BAR1+9i8sHioaM7h7vaLS9wJa6bH1tbeSpiGZTBMlOQAE2hXPCp8+eB6o4idj90tPTgQ jxig== X-Gm-Message-State: AFeK/H0pLbyhXgrX0fsGV0OqUFyofPTqjlR/BN3D7hQ1KyoQ9BLQr7q+rgsliWPFT1masxrafmtPjNqpexgRfg== X-Received: by 10.202.106.204 with SMTP id f195mr8355040oic.41.1490479139632; Sat, 25 Mar 2017 14:58:59 -0700 (PDT) MIME-Version: 1.0 Received: by 10.157.22.217 with HTTP; Sat, 25 Mar 2017 14:58:39 -0700 (PDT) In-Reply-To: <0100015b075efd74-2a227e8b-7fc9-4ebb-9187-f549733c1b6c-000000@email.amazonses.com> References: <0100015b075efd74-2a227e8b-7fc9-4ebb-9187-f549733c1b6c-000000@email.amazonses.com> From: Prakhar Goel Date: Sat, 25 Mar 2017 17:58:39 -0400 Message-ID: Subject: Re: Issues with clock skew on GCE To: Colin Percival Cc: freebsd-cloud@freebsd.org Content-Type: text/plain; charset=UTF-8 X-BeenThere: freebsd-cloud@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "FreeBSD on cloud platforms \(EC2, GCE, Azure, etc.\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 25 Mar 2017 21:59:00 -0000 Looks like that was it. If I had to guess: on the shared CPU instances, something funky happens with the TSC. ACPI-fast seems to be doing a bit better... I'll leave this in for a bit and see how things go. Thanks Colin. -- ________________________ Warm Regards Prakhar Goel