Date: Sat, 25 Mar 2017 21:28:36 +0000 From: Colin Percival <cperciva@tarsnap.com> To: Prakhar Goel <newt0311@gmail.com>, freebsd-cloud@freebsd.org Subject: Re: Issues with clock skew on GCE Message-ID: <0100015b075ef9bf-ec150480-31c3-41a7-b6e2-8378e43acc61-000000@email.amazonses.com> In-Reply-To: <CABa1M210%2B%2BioEM5LQ=Lx%2Brbsn3d4bWLojUc4T3WusOH7t-g4cg@mail.gmail.com> References: <CABa1M210%2B%2BioEM5LQ=Lx%2Brbsn3d4bWLojUc4T3WusOH7t-g4cg@mail.gmail.com>
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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
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