performance by endian

[Mori Hiroki]

Hi


Sorry I talk about AR9331 soc.

I check boot log.

RT3050 is this.


Cache info: 
  picache_stride    = 4096
  picache_loopcount = 8
  pdcache_stride    = 4096
  pdcache_loopcount = 4
cpu0: MIPS Technologies processor v76.150
  MMU: Standard TLB, 32 entries (4K 16K 64K 256K 1M 16M 64M 256M pg sizes)
  L1 i-cache: 4 ways of 256 sets, 32 bytes per line
  L1 d-cache: 4 ways of 128 sets, 32 bytes per line
  L2 cache: disabled Config1=0xbea3319e<PerfCount,WatchRegs,MIPS16,EJTAG>
  Config2=0x80000000
  Config3=0x420

AR9331 is this.

Cache info:
  picache_stride    = 4096
  picache_loopcount = 16
  pdcache_stride    = 4096
  pdcache_loopcount = 8
  max line size     = 32
cpu0: MIPS Technologies processor v116.147
  MMU: Standard TLB, 16 entries (4K 16K 64K 256K 1M 16M 64M 256M pg sizes)
  L1 i-cache: 4 ways of 512 sets, 32 bytes per line
  L1 d-cache: 4 ways of 256 sets, 32 bytes per line
  L2 cache: disabled
  Config1=0x9ee3519e<PerfCount,WatchRegs,MIPS16,EJTAG>
  Config2=0x80000000
  Config3=0x20
  Config7=0x0

I seem AR9331 have more cache than RT3050.

awk script is this.

BEGIN {
    printf "%d¥n", fib(32)
}

function fib(n) {
    if (n < 2) return n
    return fib(n - 2) + fib(n - 1)
}

----- Original Message -----
> From: Adrian Chadd <adrian.chadd at gmail.com>
> To: Mori Hiroki <yamori813 at yahoo.co.jp>
> Cc: "freebsd-mips at freebsd.org" <freebsd-mips at freebsd.org>
> Date: 2017/7/26, Wed 02:14
> Subject: Re: performance by endian
> 
> well, how much cache, how much out-of-order is it? The AR9330 SoC has
> very limited cache :(
> 
> 
> 
> -adrian
> 
> 
> On 24 July 2017 at 00:53, Mori Hiroki <yamori813 at yahoo.co.jp> wrote:
>>  Hi.
>> 
>>  I checked fib(32) by awk script.
>> 
>>  RT3050 is 80 sec
>>  AR9330 is 99 sec
>> 
>> 
>>  AR9330 is newer and clock is hight. But slow.
>> 
>>  Why this result ?
>> 
>>  I suspect this is endian issue.
>> 
>>  I have problem mruby performance at Atheros SOC.
>>  It is slow almost double from same clock little
>>  endian mips soc.
>> 
>>  Regards
>> 
>>  Hiroki Mori
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