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

[Andy Lutomirski]

On Mon, Oct 20, 2014 at 3:41 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
> On Mon, Oct 20, 2014 at 3:03 PM, H. Peter Anvin <hpa@xxxxxxxxx> 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/