linux-kernel - Re: [PATCH 0/8] x86: Disentangle the vdso and clean it up

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Message-ID: <CALCETrVTQy8=m1PnYYbbX-quJFYw5qDeAXvkuKdLo8bqCVq+vQ@mail.gmail.com>
Date:	Mon, 20 Oct 2014 21:38:48 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/8] x86: Disentangle the vdso and clean it up

On Mon, Oct 20, 2014 at 3:41 PM, Andy Lutomirski <luto@...capital.net> wrote:
> On Mon, Oct 20, 2014 at 3:03 PM, H. Peter Anvin <hpa@...or.com> 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?
>

This may just be a weird cpufreq artifact.  I need to improve my test tools :/

--Andy
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