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SubjectRe: [PATCH 0/8] x86: Disentangle the vdso and clean it up
On Mon, Oct 20, 2014 at 3:41 PM, Andy Lutomirski <luto@amacapital.net> wrote:
> On Mon, Oct 20, 2014 at 3:03 PM, H. Peter Anvin <hpa@zytor.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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