rt/snapraid
1
0
Fork 0
mirror of https://github.com/amadvance/snapraid.git synced 2026-10-26 02:49:02 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Disables SSSE3 on Atom and Jaguar CPU.

Browse source 
It's slower than plain SSE2.
This commit is contained in:
Andrea Mazzoleni 2013-10-07 22:21:26 +02:00
parent 0d3ec44803
commit e33a916295
3 changed files with 69 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

65
cpu.h
View file

@ -156,6 +156,70 @@ static inline int cpu_has_slowmult(void)
return 0;
}
/**
* Check if the processor has a slow PSHUFB implementation.
* If yes, it's better to not use it.
*/
static inline int cpu_has_slowpshufb(void)
{
char vendor[CPU_VENDOR_MAX];
unsigned family;
unsigned model;
cpu_info(vendor, &family, &model);
if (strcmp(vendor, "GenuineIntel") == 0) {
/* Intel ATOM (info from x264 -> full family/model 6/28) */
/* Intel(R) Atom(TM) CPU D525 @ 1.80GHz (info from user)
* Compiler gcc 4.7.2
* CPU GenuineIntel, family 6, model 28, flags mmx sse2 ssse3 slowmult
* Memory is little-endian 64-bit
* Support nanosecond timestamps with futimens()
*
* Speed test with 8 disk and 262144 buffer size, for a total of 2816 KiB...
* memset0 1850 [MB/s]
* CRC table 316 [MB/s]
* HASH Murmur3 378 [MB/s]
* HASH Spooky2 3389 [MB/s]
* RAID5 int32 1800 [MB/s]
* RAID5 int64 2938 [MB/s]
* RAID5 mmx 2946 [MB/s]
* RAID5 sse2 3429 [MB/s]
* RAID5 sse2ext 3447 [MB/s]
* RAID6 int32 519 [MB/s]
* RAID6 int64 944 [MB/s]
* RAID6 mmx 1160 [MB/s]
* RAID6 sse2 2082 [MB/s]
* RAID6 sse2ext 2481 [MB/s]
* RAIDTP int32 236 [MB/s]
* RAIDTP int64 456 [MB/s]
* RAIDTP mmx 576 [MB/s]
* RAIDTP sse2 1109 [MB/s]
* RAIDTP sse2ext 1527 [MB/s]
* RAIDTP ssse3 931 [MB/s] (slower than sse2ext)
* RAIDTP ssse3ext 932 [MB/s] (slower than sse2ext)
* RAIDQP int32 144 [MB/s]
* RAIDQP int64 271 [MB/s]
* RAIDQP mmx 431 [MB/s]
* RAIDQP sse2 843 [MB/s]
* RAIDQP sse2ext 1086 [MB/s]
* RAIDQP ssse3 732 [MB/s] (slower than sse2ext)
* RAIDQP ssse3ext 571 [MB/s] (slower than sse2ext)
*/
if (family == 6 && model == 28)
return 1;
}
if (strcmp(vendor, "AuthenticAMD") == 0) {
/* AMD Jaguar (info from x264 -> full family 0x16==21) */
if (family == 21)
return 1;
}
return 0;
}
/**
* Check if the processor has a slow extended set of SSE registers.
* If yes, it's better to unroll without using the second part of registers.
@ -196,7 +260,6 @@ static inline int cpu_has_slowextendedreg(void)
return 0;
}
/* other cases */
/* Intel(R) Core(TM) i7-3740QM CPU @ 2.70GHz

2
raid.c
View file

@ -2914,7 +2914,7 @@ void raid_init(void)
#endif
}
if (cpu_has_ssse3()) {
if (cpu_has_ssse3() && !cpu_has_slowpshufb()) {
#if defined(__x86_64__)
raidTP_gen = raidTP_ssse3ext;
raidQP_gen = raidQP_ssse3ext;

7
speed.c
View file

@ -89,13 +89,14 @@ void speed(void)
cpu_info(vendor, &family, &model);
printf("CPU %s, family %u, model %u, flags%s%s%s%s%s%s\n", vendor, family, model,
printf("CPU %s, family %u, model %u, flags%s%s%s%s%s%s%s\n", vendor, family, model,
cpu_has_mmx() ? " mmx" : "",
cpu_has_sse2() ? " sse2" : "",
cpu_has_ssse3() ? " ssse3" : "",
cpu_has_sse42() ? " sse42" : "",
cpu_has_avx() ? " avx" : "",
cpu_has_slowmult() ? " slowmult" : ""
cpu_has_slowmult() ? " slowmult" : "",
cpu_has_slowpshufb() ? " slowpshufb" : ""
);
}
#else
@ -335,7 +336,7 @@ void speed(void)
raidQP_mmx(buffer, diskmax, block_size);
} SPEED_STOP
printf("RAIDQP mmxr1 %"PRIu64" [MB/s]\n", ds / dt);
printf("RAIDQP mmx %"PRIu64" [MB/s]\n", ds / dt);
}
if (cpu_has_sse2()) {