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Date: Tue, 24 Jan 2017 19:11:20 +0100 From: Richard Cochran <richardcochran@...il.com> To: Marcelo Tosatti <mtosatti@...hat.com> Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>, Radim Krcmar <rkrcmar@...hat.com>, Miroslav Lichvar <mlichvar@...hat.com> Subject: Re: [patch 4/4] PTP: add kvm PTP driver On Tue, Jan 24, 2017 at 03:09:42PM -0200, Marcelo Tosatti wrote: > Add a driver with gettime method returning hosts realtime clock. > This allows Chrony to synchronize host and guest clocks with > high precision (see results below). > > chronyc> sources > MS Name/IP address Stratum Poll Reach LastRx Last sample > =============================================================================== > #* PHC0 0 3 377 4 +162ns[ -683ns] +/- 11ns > > To configure Chronyd to use PHC refclock, add the > following line to its configuration file: > > refclock PHC /dev/ptpX poll 3 dpoll -2 offset 0 > > Where /dev/ptpX is the kvmclock PTP clock. > > Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com> Acked-by: Richard Cochran <richardcochran@...il.com>
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