Re: -falign-functions=16 for i386/amd64

[Ryota Ozaki <ozaki-r%netbsd.org@localhost>]

On Tue, Sep 6, 2016 at 3:14 AM, matthew green <mrg%eterna.com.au@localhost> wrote:
>> dut1# cpuctl identify 0
>> cpu0: highest basic info 0000000b
>> cpu0: highest extended info 80000008
>> cpu0: "Intel(R) Atom(TM) CPU  C2558  @ 2.40GHz"
>> cpu0: Intel Atom C2000 (686-class), 2400.27 MHz
>> cpu0: family 0x6 model 0x4d stepping 0x8 (id 0x406d8)
>> cpu0: features 0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE>
>> cpu0: features 0xbfebfbff<MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2>
>> cpu0: features 0xbfebfbff<SS,HTT,TM,SBF>
>> cpu0: features1 0x43d8e3bf<SSE3,PCLMULQDQ,DTES64,MONITOR,DS-CPL,VMX,EST,TM2>
>> cpu0: features1 0x43d8e3bf<SSSE3,CX16,xTPR,PDCM,SSE41,SSE42,MOVBE,POPCNT>
>> cpu0: features1 0x43d8e3bf<DEADLINE,AES,RDRAND>
>> cpu0: features2 0x28100800<SYSCALL/SYSRET,XD,RDTSCP,EM64T>
>> cpu0: features3 0x101<LAHF,PREFETCHW>
>> cpu0: I-cache 32KB 64B/line 8-way, D-cache 24KB 64B/line 6-way
>> cpu0: L2 cache 1MB 64B/line 16-way
>> cpu0: ITLB 48 4KB entries fully associative
>> cpu0: DTLB 128 4KB entries 4-way, 4K/2M: 16 entries
>> cpu0: Initial APIC ID 0
>> cpu0: Cluster/Package ID 0
>> cpu0: Core ID 0
>> cpu0: SMT ID 0
>> cpu0: DSPM-eax 0x5<DTS,ARAT>
>> cpu0: DSPM-ecx 0x9<HWF,EPB>
>> cpu0: SEF highest subleaf 00000000
>> cpu0: SEF-main 0x2282<TSCADJUST,SMEP,ERMS,FPUCSDS>
>> cpu0: microcode version 0x127, platform ID 0
>>
>>
>> > can you run performance tests on systems with small cache?
>>
>> Not tested ever. It'll take a bit time to do because I don't
>> have a suitable one. BTW what size do you expect for small?
>
> ah, heh.  the above is a small system. :)

Oh, okay :)

>
> can you run it on a big system?  like a xeon with a large cpu
> cache?

Hmm, we don't have such big systems that we can test conveniently.
I hope someone who has such systems tries it out.

  ozaki-r