Date: Sun, 2 Jan 2011 11:20:11 GMT From: Colin Percival <cperciva@freebsd.org> To: freebsd-xen@FreeBSD.org Subject: Re: kern/153620: Xen guest system clock drifts in AWS EC2 (FreeBSD 9.0-CURRENT i386 T1-micro) Message-ID: <201101021120.p02BKBM6075029@freefall.freebsd.org>
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The following reply was made to PR kern/153620; it has been noted by GNATS. From: Colin Percival <cperciva@freebsd.org> To: bug-followup@FreeBSD.org, fbsd-9.0-aws-ec2-1293964000@holmberg.to Cc: Subject: Re: kern/153620: Xen guest system clock drifts in AWS EC2 (FreeBSD 9.0-CURRENT i386 T1-micro) Date: Sun, 02 Jan 2011 03:16:52 -0800 This is interesting -- I thought I had squashed all the clock drift bugs. Can you tell me: 1. Did the clock run ahead, or behind? 2. Can you reproduce this? 3. Did the clock _drift_, or _jump_? The 2200 seconds mentioned is almost exactly the 2^41 ns period of the Xen timecounter, so if the clock jumped it's probably safe to guess that it's involved somehow... -- Colin Percival Security Officer, FreeBSD | freebsd.org | The power to serve Founder / author, Tarsnap | tarsnap.com | Online backups for the truly paranoid
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