On 12/20/2012 08:46 AM, Yinghai Lu wrote:
> On Thu, Dec 20, 2012 at 2:38 AM, Zhang, Lin-Bao (Linux Kernel R)
> wrote:
>> I think current core argument is our BIOS did following judgement ,
>> but Linux kernel did not(Linux seems just judge BSP supports x2apic mode or
>> not by CPUID method)
>
>
On Thu, Dec 20, 2012 at 2:38 AM, Zhang, Lin-Bao (Linux Kernel R)
wrote:
> I think current core argument is our BIOS did following judgement ,
> but Linux kernel did not(Linux seems just judge BSP supports x2apic mode or
> not by CPUID method)
kernel checks that, if the BSP in x2apic mode,
Hi Yinghai,
Maybe two days ago, mis-understand the usage of MSR.
Today, I carefully researched Intel? 64 Architecture x2APIC Specification which
is open for all people.
I think current core argument is our BIOS did following judgement ,
but Linux kernel did not(Linux seems just judge
Hi Yinghai,
Maybe two days ago, mis-understand the usage of MSR.
Today, I carefully researched Intel? 64 Architecture x2APIC Specification which
is open for all people.
I think current core argument is our BIOS did following judgement ,
but Linux kernel did not(Linux seems just judge
On Thu, Dec 20, 2012 at 2:38 AM, Zhang, Lin-Bao (Linux Kernel RD)
linbao.zh...@hp.com wrote:
I think current core argument is our BIOS did following judgement ,
but Linux kernel did not(Linux seems just judge BSP supports x2apic mode or
not by CPUID method)
kernel checks that, if the BSP in
On 12/20/2012 08:46 AM, Yinghai Lu wrote:
On Thu, Dec 20, 2012 at 2:38 AM, Zhang, Lin-Bao (Linux Kernel RD)
linbao.zh...@hp.com wrote:
I think current core argument is our BIOS did following judgement ,
but Linux kernel did not(Linux seems just judge BSP supports x2apic mode or
not by CPUID
On 12/18/2012 09:49 AM, Yinghai Lu wrote:
>
> So you need to make cpuid show does not support x2apic --- check with
> intel they have way to do that.
>
No, but there is a flag in ACPI that "this BIOS is broken with x2APIC".
Setting that flag as opposed to fixing the bugs, though is very much
On Wed, Dec 19, 2012 at 2:36 AM, Zhang, Lin-Bao (Linux Kernel R)
wrote:
> Hi Yinghai ,
>
> Actually ,my question like this:
> OS can really enable x2apic correctly without BIOS' help in this case :
> BIOS has claimed definitely it doesn't enable x2apic ,but OS feel it can
> enable x2apic(based
On Wed, Dec 19, 2012 at 2:13 AM, Zhang, Lin-Bao (Linux Kernel R)
wrote:
>> > b) If BIOS feel the system doesn't meet x2apic conditions , it will not set
>> x2apic enablement bit in MSR ,and pass control to OS with xapic mode.
>>
>> kernel will check if cpuid support x2apic, if it supports x2apic,
Hi Yinghai ,
Actually ,my question like this:
OS can really enable x2apic correctly without BIOS' help in this case :
BIOS has claimed definitely it doesn't enable x2apic ,but OS feel it can enable
x2apic(based on BSP supports x2apic) ).
If Linux don't need BIOS' help , how did linux
Hi Yinghai ,
Thanks very much for your reply. I also checked some other previous
emails about x2apic patches.
> From: yhlu.ker...@gmail.com [mailto:yhlu.ker...@gmail.com] On Behalf Of
> Yinghai Lu
I just worry about this case,
> > b) If BIOS feel the system doesn't meet x2apic
Hi Yinghai ,
Thanks very much for your reply. I also checked some other previous
emails about x2apic patches.
From: yhlu.ker...@gmail.com [mailto:yhlu.ker...@gmail.com] On Behalf Of
Yinghai Lu
I just worry about this case,
b) If BIOS feel the system doesn't meet x2apic conditions
Hi Yinghai ,
Actually ,my question like this:
OS can really enable x2apic correctly without BIOS' help in this case :
BIOS has claimed definitely it doesn't enable x2apic ,but OS feel it can enable
x2apic(based on BSP supports x2apic) ).
If Linux don't need BIOS' help , how did linux
On Wed, Dec 19, 2012 at 2:13 AM, Zhang, Lin-Bao (Linux Kernel RD)
linbao.zh...@hp.com wrote:
b) If BIOS feel the system doesn't meet x2apic conditions , it will not set
x2apic enablement bit in MSR ,and pass control to OS with xapic mode.
kernel will check if cpuid support x2apic, if it
On Wed, Dec 19, 2012 at 2:36 AM, Zhang, Lin-Bao (Linux Kernel RD)
linbao.zh...@hp.com wrote:
Hi Yinghai ,
Actually ,my question like this:
OS can really enable x2apic correctly without BIOS' help in this case :
BIOS has claimed definitely it doesn't enable x2apic ,but OS feel it can
enable
On 12/18/2012 09:49 AM, Yinghai Lu wrote:
So you need to make cpuid show does not support x2apic --- check with
intel they have way to do that.
No, but there is a flag in ACPI that this BIOS is broken with x2APIC.
Setting that flag as opposed to fixing the bugs, though is very much not
On Tue, Dec 18, 2012 at 1:50 AM, Zhang, Lin-Bao (Linux Kernel R)
wrote:
> Hi Suresh and other guys ,
>
> In 3.4.4/3.6.6 ,I found a x2apic issue . if I am wrong , sorry first
> , and welcome your correction . thanks for your forwarding other maintainers.
> I am testing a server , its BIOS
On Tue, Dec 18, 2012 at 1:50 AM, Zhang, Lin-Bao (Linux Kernel RD)
linbao.zh...@hp.com wrote:
Hi Suresh and other guys ,
In 3.4.4/3.6.6 ,I found a x2apic issue . if I am wrong , sorry first
, and welcome your correction . thanks for your forwarding other maintainers.
I am testing a
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