From: "Dan Magenheimer" <dan.magenheimer@oracle.com>
To: Ian Pratt <Ian.Pratt@eu.citrix.com>,
Keir Fraser <Keir.Fraser@eu.citrix.com>,
"Xen-Devel (E-mail)" <xen-devel@lists.xensource.com>
Cc: Dave Winchell <dwinchell@virtualiron.com>
Subject: RE: Xen system skew MUCH worse than tsc skew (was RE: RE: [PATCH] record max stime skew (was RE: [PATCH] strictly increasinghvm guest time))
Date: Sat, 12 Jul 2008 15:05:45 -0600 [thread overview]
Message-ID: <20080712150545593.00000003744@djm-pc> (raw)
In-Reply-To: <DD74FBB8EE28D441903D56487861CD9D320E5487@lonpexch01.citrite.net>
> Some NUMA systems have different oscillators on each node so you can't
> rely on the frequency being identical. Such systems are fairly rare
> (though their common use case is server virtualization). I guess a
> command line option to enable independent calibration for
> these systems
> would be OK, though it would obviously be better to start off assuming
> the frequencies are identical, and then detect rate differences.
>
> Ian
Good point. This is the way that Linux does it too, I think.
Dan
next prev parent reply other threads:[~2008-07-12 21:05 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-02 16:03 [PATCH] strictly increasing hvm guest time Dan Magenheimer
2008-07-02 16:07 ` Keir Fraser
2008-07-02 21:50 ` Dan Magenheimer
2008-07-02 22:41 ` [PATCH] record max stime skew (was RE: [PATCH] strictly increasing hvm guest time) Dan Magenheimer
2008-07-03 8:03 ` Keir Fraser
2008-07-03 16:24 ` Dan Magenheimer
2008-07-03 16:35 ` Dan Magenheimer
2008-07-03 20:03 ` Dan Magenheimer
2008-07-03 23:00 ` Keir Fraser
2008-07-04 15:11 ` Dan Magenheimer
2008-07-04 15:22 ` Keir Fraser
2008-07-04 19:32 ` Dan Magenheimer
2008-07-04 19:56 ` Keir Fraser
2008-07-10 0:24 ` Dan Magenheimer
2008-07-10 7:40 ` Keir Fraser
2008-07-10 22:42 ` Xen system skew MUCH worse than tsc skew (was RE: RE: [PATCH] record max stime skew (was RE: [PATCH] strictly increasing hvm guest time)) Dan Magenheimer
2008-07-11 8:27 ` Keir Fraser
2008-07-11 20:53 ` Dan Magenheimer
2008-07-11 21:27 ` Xen system skew MUCH worse than tsc skew (was RE: RE: [PATCH] record max stime skew (was RE: [PATCH] strictly increasinghvm " Ian Pratt
2008-07-12 21:05 ` Dan Magenheimer [this message]
2008-07-11 21:27 ` Xen system skew MUCH worse than tsc skew (was RE: RE: [PATCH] record max stime skew (was RE: [PATCH] strictly increasing hvm " Keir Fraser
2008-07-12 21:07 ` Dan Magenheimer
2008-07-19 17:51 ` Dan Magenheimer
2008-07-21 8:32 ` Keir Fraser
2008-07-22 22:27 ` Dan Magenheimer
2008-07-22 23:07 ` Xen system skew MUCH worse than tsc skew (was RE: RE: [PATCH] record max stime skew (was RE: [PATCH] strictly increasinghvm " Ian Pratt
2008-07-23 0:40 ` Dan Magenheimer
2008-07-23 1:16 ` Ian Pratt
2008-07-23 6:11 ` Tian, Kevin
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