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From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Jan Beulich <JBeulich@suse.com>,
	xen-devel <xen-devel@lists.xenproject.org>
Cc: Joao Martins <joao.m.martins@oracle.com>,
	Wei Liu <wei.liu2@citrix.com>,
	Dario Faggioli <dario.faggioli@eu.citrix.com>
Subject: Re: [PATCH] x86/time: use correct (local) time stamp in constant-TSC calibration fast path
Date: Thu, 9 Jun 2016 13:10:38 +0100	[thread overview]
Message-ID: <57595CBE.6070400@citrix.com> (raw)
In-Reply-To: <575976AE02000078000F3695@prv-mh.provo.novell.com>

On 09/06/16 13:01, Jan Beulich wrote:
> This looks like a copy and paste mistake in commit 1b6a99892d ("x86:
> Simpler time handling when TSC is constant across all power saving
> states"), responsible for occasional many-microsecond cross-CPU skew of
> what NOW() returns.
> Also improve the correlation between local TSC and stime stamps
> obtained at the end of the two calibration handlers: Compute the stime
> one from the TSC one, instead of doing another rdtsc() for that
> compuation.
> Signed-off-by: Jan Beulich <jbeulich@suse.com>

Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

That does indeed look like a copy/paste mistake.  I would be tempted to
leave this in -unstable for a while.


Xen-devel mailing list

  reply	other threads:[~2016-06-09 12:10 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-09 12:01 Jan Beulich
2016-06-09 12:10 ` Andrew Cooper [this message]
2016-06-09 12:11 ` Joao Martins
2016-06-09 12:57   ` Jan Beulich
2016-06-09 15:00     ` Joao Martins
2016-06-09 15:52       ` Jan Beulich
2016-06-09 18:19         ` Joao Martins
2016-06-10  6:59           ` Jan Beulich
2016-06-10  9:29             ` Jan Beulich
2016-06-10 17:07               ` Joao Martins
2016-06-09 12:12 ` Wei Liu

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