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Date:	Mon, 20 Oct 2014 15:41:53 -0700
From:	Andy Lutomirski <>
To:	"H. Peter Anvin" <>
Cc:	Thomas Gleixner <>,
	Ingo Molnar <>, X86 ML <>,
	"" <>
Subject: Re: [PATCH 0/8] x86: Disentangle the vdso and clean it up

On Mon, Oct 20, 2014 at 3:03 PM, H. Peter Anvin <> wrote:
> On 10/20/2014 02:57 PM, Andy Lutomirski wrote:
>> Should I send a replacement for patch 8 or should I let you merge 1-7
>> and fold this into the followup series?
> Please send a replacement.

Sending in a sec.

Also, this is really weird.  Unless I'm completely nuts, lsl is faster
in KVM than it is on bare metal.  This makes me wonder whether
something's suboptimal about the way that the GDT is set up.  sgdt is
faster, too.  This is Sandy Bridge E, one socket.  The difference is
big enough that tracking it down might be a significant win on context
switches.  Any hints?


>         -hpa

Andy Lutomirski
AMA Capital Management, LLC
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