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Difference between revisions of "Talk:Intel64-haswell"
(Suggestion to add the "LZCNT" flag to CPU_FLAGS_X86) |
m (minor grammer changes to my last post) |
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[1] http://www.funtoo.org/CPU_FLAGS | [1] http://www.funtoo.org/CPU_FLAGS | ||
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LZCNT is indeed listed on the CPU_FLAGS page. | |||
--[[User:Drobbins|Drobbins]] ([[User talk:Drobbins|talk]]) 22:55, May 9, 2015 (UTC) | |||
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LZCNT is '''not''' listed within the flags of the XEON E5-2660 of the 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) | |||
Latest revision as of 18:36, 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 of the 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)