Difference between revisions of "Talk:Intel64-haswell"

From Funtoo
Jump to: navigation, search
Line 11: Line 11:
  
 
--[[User:Drobbins|Drobbins]] ([[User talk:Drobbins|talk]]) 22:55, May 9, 2015 (UTC)
 
--[[User:Drobbins|Drobbins]] ([[User talk:Drobbins|talk]]) 22:55, May 9, 2015 (UTC)
 +
 +
 +
 +
----
 +
 +
LZCNT is '''not''' listed within the flags of the XEON E5-2660 at server, that i rent
 +
<console>
 +
# ##i##cat /proc/cpuinfo | head -n5
 +
processor : 0
 +
vendor_id : GenuineIntel
 +
cpu family : 6
 +
model : 63
 +
model name : Intel(R) Xeon(R) CPU E5-2660 v3 @ 2.60GHz
 +
# ##i##cat /proc/cpuinfo | grep LZCNT | wc -l
 +
0
 +
</console>
 +
I'm not sure if that information is absolutely reliable, since this is a QEMU based VPS and i don't know if the guest has full access to all the host CPU instructions. When i asked the provider about that, he answered "You have access to all instructions except for hyperthreading".
 +
 +
I hope, that helps a bit however.<br />
 +
--[[User:Schentuu|schentuu]] ([[User talk:Schentuu|talk]]) 18:25, May 18, 2015 (UTC)

Revision as of 18:25, May 18, 2015

Should the CPU_FLAGS suggested on this page include "lzcnt"? As listed here [1] lzcnt was adopted in Intel Haswell.

Or is there a special reason that LZCNT was not listed on this page?

[1] http://www.funtoo.org/CPU_FLAGS


LZCNT is indeed listed on the CPU_FLAGS page.

--Drobbins (talk) 22:55, May 9, 2015 (UTC)



LZCNT is not listed within the flags of the XEON E5-2660 at server, that i rent

root # cat /proc/cpuinfo | head -n5
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 63
model name	: Intel(R) Xeon(R) CPU E5-2660 v3 @ 2.60GHz
root # cat /proc/cpuinfo | grep LZCNT | wc -l
0

I'm not sure if that information is absolutely reliable, since this is a QEMU based VPS and i don't know if the guest has full access to all the host CPU instructions. When i asked the provider about that, he answered "You have access to all instructions except for hyperthreading".

I hope, that helps a bit however.
--schentuu (talk) 18:25, May 18, 2015 (UTC)