From: Brian Ristuccia <brian@ristuccia.com>
Date: Fri, 31 Jul 2009 13:27:02 GMT
Subject: Re: Request for benchmarking: x86 SHA1 code
Message-ID: <20090731132702.GY12813@osiris.978.org>
In-Reply-To: <20090731104602.15375.qmail@science.horizon.com>

The revised code is faster on Intel Atom N270 by around 15% (results below
typical of several runs):

$ ./586test ; ./x86test 
Result:  a9993e36 4706816a ba3e2571 7850c26c 9cd0d89d
Expected:a9993e36 4706816a ba3e2571 7850c26c 9cd0d89d
500000000 bytes: 4.981760 s
Result:  a9993e36 4706816a ba3e2571 7850c26c 9cd0d89d
Expected:a9993e36 4706816a ba3e2571 7850c26c 9cd0d89d
500000000 bytes: 4.323324 s

$ cat /proc/cpuinfo

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 28
model name	: Intel(R) Atom(TM) CPU N270   @ 1.60GHz
stepping	: 2
cpu MHz		: 800.000
cache size	: 512 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 1
apicid		: 0
initial apicid	: 0
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 10
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc
arch_perfmon pebs bts pni dtes64 monitor ds_cpl est tm2 ssse3 xtpr pdcm
lahf_lm
bogomips	: 3191.59
clflush size	: 64
power management:

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 28
model name	: Intel(R) Atom(TM) CPU N270   @ 1.60GHz
stepping	: 2
cpu MHz		: 800.000
cache size	: 512 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 1
apicid		: 1
initial apicid	: 1
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 10
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc
arch_perfmon pebs bts pni dtes64 monitor ds_cpl est tm2 ssse3 xtpr pdcm
lahf_lm
bogomips	: 3191.91
clflush size	: 64
power management:

-- 
Brian Ristuccia
brian@ristuccia.com