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erzapito
Tux's lil' helper
Tux's lil' helper


Joined: 02 Feb 2007
Posts: 88

PostPosted: Tue Feb 10, 2015 2:15 pm    Post subject: Intel Celeron N2840 Flags Reply with quote

Hi, I'm installing gentoo on a laptot with a N2840.

When I check cpuinfo i get the following:

Code:

processor   : 1
vendor_id   : GenuineIntel
cpu family   : 6
model      : 55
model name   : Intel(R) Celeron(R) CPU  N2840  @ 2.16GHz
stepping   : 8
microcode   : 0x809
cpu MHz      : 816.658
cache size   : 1024 KB
physical id   : 0
siblings   : 2
core id      : 1
cpu cores   : 2
apicid      : 2
initial apicid   : 2
fpu      : yes
fpu_exception   : yes
cpuid level   : 11
wp      : yes
flags      : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 movbe popcnt tsc_deadline_timer rdrand lahf_lm 3dnowprefetch ida arat epb dtherm tpr_shadow vnmi flexpriority ept vpid tsc_adjust smep erms
bugs      :
bogomips   : 4326.40
clflush size   : 64
cache_alignment   : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:


mmx is supossed to be supported. But if i run:

Code:
gcc -march=native -Q --help=target -v

mmx is not active.

Can anyone tell if I should or not enabled this as a cpu flag? libvpx is asking me to enable it if i want to use sse2, which is indeed active.
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krinn
Advocate
Advocate


Joined: 02 May 2003
Posts: 4875

PostPosted: Tue Feb 10, 2015 4:20 pm    Post subject: Reply with quote

Known issue, appears on gcc < 4.9
https://forums.gentoo.org/viewtopic-p-7693494.html#7693494
Don't worry, just enable mmx, and if you enable sse, even gcc is telling you it won't, it will enable mmx in real.
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