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

[matthew green <mrg%eterna.com.au@localhost>]

> 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. :)

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


.mrg.