From owner-svn-src-head@freebsd.org Wed Dec 9 21:49:32 2015 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 81CE99D5ACC; Wed, 9 Dec 2015 21:49:32 +0000 (UTC) (envelope-from rrs@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 46F8B12DD; Wed, 9 Dec 2015 21:49:32 +0000 (UTC) (envelope-from rrs@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id tB9LnVmH034872; Wed, 9 Dec 2015 21:49:31 GMT (envelope-from rrs@FreeBSD.org) Received: (from rrs@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id tB9LnVJX034871; Wed, 9 Dec 2015 21:49:31 GMT (envelope-from rrs@FreeBSD.org) Message-Id: <201512092149.tB9LnVJX034871@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: rrs set sender to rrs@FreeBSD.org using -f From: Randall Stewart Date: Wed, 9 Dec 2015 21:49:31 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r292027 - head/usr.sbin/pmcstudy X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Dec 2015 21:49:32 -0000 Author: rrs Date: Wed Dec 9 21:49:31 2015 New Revision: 292027 URL: https://svnweb.freebsd.org/changeset/base/292027 Log: Proper support of Broadwell tool by the pmc_study based on the Intel Itune guide for 5th generation processors. There is at least one formula missing in that guide, which I extrapolated and put a ? by in the help. Sponsored by: Netflix Inc Modified: head/usr.sbin/pmcstudy/pmcstudy.c Modified: head/usr.sbin/pmcstudy/pmcstudy.c ============================================================================== --- head/usr.sbin/pmcstudy/pmcstudy.c Wed Dec 9 21:38:26 2015 (r292026) +++ head/usr.sbin/pmcstudy/pmcstudy.c Wed Dec 9 21:49:31 2015 (r292027) @@ -443,7 +443,6 @@ explain_name_has(const char *name) printf("If the value printed is %s we may have the ability to improve performance\n", mythresh); } - static struct counters * find_counter(struct counters *base, const char *name) { @@ -590,6 +589,47 @@ br_mispredictib(struct counters *cpu, in } static int +br_mispredict_broad(struct counters *cpu, int pos) +{ + struct counters *brctr; + struct counters *unhalt; + struct counters *clear; + struct counters *uops; + struct counters *uops_ret; + struct counters *recv; + int ret; + double br, cl, uo, uo_r, re, con, un, res; + + con = 4.0; + + unhalt = find_counter(cpu, "CPU_CLK_UNHALTED.THREAD_P"); + brctr = find_counter(cpu, "BR_MISP_RETIRED.ALL_BRANCHES"); + clear = find_counter(cpu, "MACHINE_CLEARS.CYCLES"); + uops = find_counter(cpu, "UOPS_ISSUED.ANY"); + uops_ret = find_counter(cpu, "UOPS_RETIRED.RETIRE_SLOTS"); + recv = find_counter(cpu, "INT_MISC.RECOVERY_CYCLES"); + + if (pos != -1) { + un = unhalt->vals[pos] * 1.0; + br = brctr->vals[pos] * 1.0; + cl = clear->vals[pos] * 1.0; + uo = uops->vals[pos] * 1.0; + uo_r = uops_ret->vals[pos] * 1.0; + re = recv->vals[pos] * 1.0; + } else { + un = unhalt->sum * 1.0; + br = brctr->sum * 1.0; + cl = clear->sum * 1.0; + uo = uops->sum * 1.0; + uo_r = uops_ret->sum * 1.0; + re = recv->sum * 1.0; + } + res = br / (br + cl) * (uo - uo_r + con * re) / (un * con); + ret = printf("%1.3f", res); + return(ret); +} + +static int splitloadib(struct counters *cpu, int pos) { int ret; @@ -717,6 +757,35 @@ contested_has(struct counters *cpu, int return(ret); } +static int +contestedbroad(struct counters *cpu, int pos) +{ + /* 6 - (MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_HITM * 84) / CPU_CLK_UNHALTED.THREAD_P (thresh >.05) */ + int ret; + struct counters *mem; + struct counters *mem2; + struct counters *unhalt; + double con, un, memd, memtoo, res; + + con = 84.0; + unhalt = find_counter(cpu, "CPU_CLK_UNHALTED.THREAD_P"); + mem = find_counter(cpu, "MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_HITM"); + mem2 = find_counter(cpu,"MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_MISS"); + + if (pos != -1) { + memd = mem->vals[pos] * 1.0; + memtoo = mem2->vals[pos] * 1.0; + un = unhalt->vals[pos] * 1.0; + } else { + memd = mem->sum * 1.0; + memtoo = mem2->sum * 1.0; + un = unhalt->sum * 1.0; + } + res = ((memd * con) + memtoo)/un; + ret = printf("%1.3f", res); + return(ret); +} + static int blockstoreforward(struct counters *cpu, int pos) @@ -898,6 +967,33 @@ cache2has(struct counters *cpu, int pos) } static int +cache2broad(struct counters *cpu, int pos) +{ + /* + * (29 * MEM_LOAD_UOPS_RETIRED.LLC_HIT / CPU_CLK_UNHALTED.THREAD_P (thresh >.2) + */ + int ret; + struct counters *mem; + struct counters *unhalt; + double con, un, me, res; + + con = 36.0; + unhalt = find_counter(cpu, "CPU_CLK_UNHALTED.THREAD_P"); + mem = find_counter(cpu, "MEM_LOAD_UOPS_RETIRED.L3_HIT"); + if (pos != -1) { + me = mem->vals[pos] * 1.0; + un = unhalt->vals[pos] * 1.0; + } else { + me = mem->sum * 1.0; + un = unhalt->sum * 1.0; + } + res = (con * me)/un; + ret = printf("%1.3f", res); + return(ret); +} + + +static int cache1(struct counters *cpu, int pos) { /* 9 - (MEM_LOAD_UOPS_MISC_RETIRED.LLC_MISS * 180) / CPU_CLK_UNHALTED.THREAD_P (thresh >= .2) */ @@ -947,6 +1043,31 @@ cache1ib(struct counters *cpu, int pos) static int +cache1broad(struct counters *cpu, int pos) +{ + /* 9 - (MEM_LOAD_UOPS_L3_MISS_RETIRED.LCOAL_DRAM * 180) / CPU_CLK_UNHALTED.THREAD_P (thresh >= .2) */ + int ret; + struct counters *mem; + struct counters *unhalt; + double con, un, me, res; + + con = 180.0; + unhalt = find_counter(cpu, "CPU_CLK_UNHALTED.THREAD_P"); + mem = find_counter(cpu, "MEM_LOAD_UOPS_RETIRED.L3_MISS"); + if (pos != -1) { + me = mem->vals[pos] * 1.0; + un = unhalt->vals[pos] * 1.0; + } else { + me = mem->sum * 1.0; + un = unhalt->sum * 1.0; + } + res = (me * con)/un; + ret = printf("%1.3f", res); + return(ret); +} + + +static int dtlb_missload(struct counters *cpu, int pos) { /* 10 - ((DTLB_LOAD_MISSES.STLB_HIT * 7) + DTLB_LOAD_MISSES.WALK_DURATION) / CPU_CLK_UNHALTED.THREAD_P (t >=.1) */ @@ -1026,6 +1147,35 @@ itlb_miss(struct counters *cpu, int pos) return(ret); } + +static int +itlb_miss_broad(struct counters *cpu, int pos) +{ + /* (7 * ITLB_MISSES.STLB_HIT_4K + ITLB_MISSES.WALK_DURATION) / CPU_CLK_UNTHREAD_P */ + int ret; + struct counters *itlb; + struct counters *unhalt; + struct counters *four_k; + double un, d1, res, k; + + unhalt = find_counter(cpu, "CPU_CLK_UNHALTED.THREAD_P"); + itlb = find_counter(cpu, "ITLB_MISSES.WALK_DURATION"); + four_k = find_counter(cpu, "ITLB_MISSES.STLB_HIT_4K"); + if (pos != -1) { + d1 = itlb->vals[pos] * 1.0; + un = unhalt->vals[pos] * 1.0; + k = four_k->vals[pos] * 1.0; + } else { + d1 = itlb->sum * 1.0; + un = unhalt->sum * 1.0; + k = four_k->sum * 1.0; + } + res = (7.0 * k + d1)/un; + ret = printf("%1.3f", res); + return(ret); +} + + static int icache_miss(struct counters *cpu, int pos) { @@ -1163,6 +1313,39 @@ clears(struct counters *cpu, int pos) } static int +clears_broad(struct counters *cpu, int pos) +{ + int ret; + struct counters *clr1, *clr2, *clr3, *cyc; + struct counters *unhalt; + double con, un, cl1, cl2, cl3, cy, res; + + con = 100.0; + unhalt = find_counter(cpu, "CPU_CLK_UNHALTED.THREAD_P"); + clr1 = find_counter(cpu, "MACHINE_CLEARS.MEMORY_ORDERING"); + clr2 = find_counter(cpu, "MACHINE_CLEARS.SMC"); + clr3 = find_counter(cpu, "MACHINE_CLEARS.MASKMOV"); + cyc = find_counter(cpu, "MACHINE_CLEARS.CYCLES"); + if (pos != -1) { + cl1 = clr1->vals[pos] * 1.0; + cl2 = clr2->vals[pos] * 1.0; + cl3 = clr3->vals[pos] * 1.0; + cy = cyc->vals[pos] * 1.0; + un = unhalt->vals[pos] * 1.0; + } else { + cl1 = clr1->sum * 1.0; + cl2 = clr2->sum * 1.0; + cl3 = clr3->sum * 1.0; + cy = cyc->sum * 1.0; + un = unhalt->sum * 1.0; + } + /* Formula not listed but extrapulated to add the cy ?? */ + res = ((cl1 + cl2 + cl3 + cy) * con)/un; + ret = printf("%1.3f", res); + return(ret); +} + +static int microassist(struct counters *cpu, int pos) { /* 14 - IDQ.MS_CYCLES / CPU_CLK_UNHALTED.THREAD_P (thresh > .05) */ @@ -1186,6 +1369,36 @@ microassist(struct counters *cpu, int po return(ret); } +static int +microassist_broad(struct counters *cpu, int pos) +{ + int ret; + struct counters *idq; + struct counters *unhalt; + struct counters *uopiss; + struct counters *uopret; + double un, id, res, con, uoi, uor; + + con = 4.0; + unhalt = find_counter(cpu, "CPU_CLK_UNHALTED.THREAD_P"); + idq = find_counter(cpu, "IDQ.MS_UOPS"); + uopiss = find_counter(cpu, "UOPS_ISSUED.ANY"); + uopret = find_counter(cpu, "UOPS_RETIRED.RETIRE_SLOTS"); + if (pos != -1) { + id = idq->vals[pos] * 1.0; + un = unhalt->vals[pos] * 1.0; + uoi = uopiss->vals[pos] * 1.0; + uor = uopret->vals[pos] * 1.0; + } else { + id = idq->sum * 1.0; + un = unhalt->sum * 1.0; + uoi = uopiss->sum * 1.0; + uor = uopret->sum * 1.0; + } + res = (uor/uoi) * (id/(un * con)); + ret = printf("%1.3f", res); + return(ret); +} static int aliasing(struct counters *cpu, int pos) @@ -1212,6 +1425,31 @@ aliasing(struct counters *cpu, int pos) } static int +aliasing_broad(struct counters *cpu, int pos) +{ + /* 15 - (LD_BLOCKS_PARTIAL.ADDRESS_ALIAS * 5) / CPU_CLK_UNHALTED.THREAD_P (thresh > .1) */ + int ret; + struct counters *ld; + struct counters *unhalt; + double un, lds, con, res; + + con = 7.0; + unhalt = find_counter(cpu, "CPU_CLK_UNHALTED.THREAD_P"); + ld = find_counter(cpu, "LD_BLOCKS_PARTIAL.ADDRESS_ALIAS"); + if (pos != -1) { + lds = ld->vals[pos] * 1.0; + un = unhalt->vals[pos] * 1.0; + } else { + lds = ld->sum * 1.0; + un = unhalt->sum * 1.0; + } + res = (lds * con)/un; + ret = printf("%1.3f", res); + return(ret); +} + + +static int fpassists(struct counters *cpu, int pos) { /* 16 - FP_ASSIST.ANY/INST_RETIRED.ANY_P */ @@ -1530,6 +1768,131 @@ static struct cpu_entry haswell[HASWELL_ static void +explain_name_broad(const char *name) +{ + const char *mythresh; + if (strcmp(name, "eff1") == 0) { + printf("Examine (UOPS_RETIRED.RETIRE_SLOTS)/(4 *CPU_CLK_UNHALTED.THREAD_P)\n"); + mythresh = "thresh < .75"; + } else if (strcmp(name, "eff2") == 0) { + printf("Examine CPU_CLK_UNHALTED.THREAD_P/INST_RETIRED.ANY_P\n"); + mythresh = "thresh > 1.0"; + } else if (strcmp(name, "itlbmiss") == 0) { + printf("Examine (7 * ITLB_MISSES_STLB_HIT_4K + ITLB_MISSES.WALK_DURATION)/ CPU_CLK_UNHALTED.THREAD_P\n"); + mythresh = "thresh > .05"; + } else if (strcmp(name, "icachemiss") == 0) { + printf("Examine ( 36.0 * CACHE.MISSES)/ CPU_CLK_UNHALTED.THREAD_P ??? may not be right \n"); + mythresh = "thresh > .05"; + } else if (strcmp(name, "lcpstall") == 0) { + printf("Examine ILD_STALL.LCP/CPU_CLK_UNHALTED.THREAD_P\n"); + mythresh = "thresh > .05"; + } else if (strcmp(name, "cache1") == 0) { + printf("Examine (MEM_LOAD_UOPS_LLC_MISS_RETIRED.LOCAL_DRAM * 180) / CPU_CLK_UNHALTED.THREAD_P\n"); + mythresh = "thresh >= .1"; + } else if (strcmp(name, "cache2") == 0) { + printf("Examine (36.0 * MEM_LOAD_UOPS_RETIRED.L3_HIT / CPU_CLK_UNHALTED.THREAD_P)\n"); + mythresh = "thresh >= .2"; + } else if (strcmp(name, "contested") == 0) { + printf("Examine ((MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_HITM * 84) + MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_MISS)/ CPU_CLK_UNHALTED.THREAD_P\n"); + mythresh = "thresh >= .05"; + } else if (strcmp(name, "datashare") == 0) { + printf("Examine (MEM_LOAD_UOPS_L3_HIT_RETIRED.XSNP_HIT * 72)/CPU_CLK_UNHALTED.THREAD_P\n"); + mythresh = "thresh > .05"; + } else if (strcmp(name, "blockstorefwd") == 0) { + printf("Examine (LD_BLOCKS_STORE_FORWARD * 13) / CPU_CLK_UNHALTED.THREAD_P\n"); + mythresh = "thresh >= .05"; + } else if (strcmp(name, "aliasing_4k") == 0) { + printf("Examine (LD_BLOCKS_PARTIAL.ADDRESS_ALIAS * 7) / CPU_CLK_UNHALTED.THREAD_P\n"); + mythresh = "thresh >= .1"; + } else if (strcmp(name, "dtlbmissload") == 0) { + printf("Examine (((DTLB_LOAD_MISSES.STLB_HIT * 7) + DTLB_LOAD_MISSES.WALK_DURATION)\n"); + printf(" / CPU_CLK_UNHALTED.THREAD_P)\n"); + mythresh = "thresh >= .1"; + + } else if (strcmp(name, "br_miss") == 0) { + printf("Examine BR_MISP_RETIRED.ALL_BRANCHS_PS / (BR_MISP_RETIED.ALL_BRANCHES_PS + MACHINE_CLEARS.COUNT) *\n"); + printf(" (UOPS_ISSUEDF.ANY - UOPS_RETIRED.RETIRE_SLOTS + 4 * INT_MISC.RECOVERY_CYCLES) /\n"); + printf("CPU_CLK_UNHALTED.THREAD * 4)\n"); + mythresh = "thresh >= .2"; + } else if (strcmp(name, "clears") == 0) { + printf("Examine ((MACHINE_CLEARS.MEMORY_ORDERING + \n"); + printf(" MACHINE_CLEARS.SMC + \n"); + printf(" MACHINE_CLEARS.MASKMOV ) * 100 ) / CPU_CLK_UNHALTED.THREAD_P\n"); + mythresh = "thresh >= .02"; + } else if (strcmp(name, "fpassist") == 0) { + printf("Examine FP_ASSIST.ANY/INST_RETIRED.ANY_P\n"); + mythresh = "look for a excessive value"; + } else if (strcmp(name, "otherassistavx") == 0) { + printf("Examine (OTHER_ASSISTS.AVX_TO_SSE * 75)/CPU_CLK_UNHALTED.THREAD_P\n"); + mythresh = "look for a excessive value"; + } else if (strcmp(name, "microassist") == 0) { + printf("Examine (UOPS_RETIRED.RETIRE_SLOTS/UOPS_ISSUED.ANY) * (IDQ.MS_CYCLES / (4 * CPU_CLK_UNHALTED.THREAD_P)\n"); + printf("***We use IDQ.MS_UOPS,cmask=1 to get cycles\n"); + mythresh = "thresh >= .05"; + } else { + printf("Unknown name:%s\n", name); + mythresh = "unknown entry"; + } + printf("If the value printed is %s we may have the ability to improve performance\n", mythresh); +} + + +#define BROADWELL_COUNT 17 +static struct cpu_entry broadwell[BROADWELL_COUNT] = { +/*1*/ { "eff1", "thresh < .75", + "pmcstat -s UOPS_RETIRED.RETIRE_SLOTS -s CPU_CLK_UNHALTED.THREAD_P -w 1", + efficiency1 }, +/*2*/ { "eff2", "thresh > 1.0", + "pmcstat -s INST_RETIRED.ANY_P -s CPU_CLK_UNHALTED.THREAD_P -w 1", + efficiency2 }, +/*3*/ { "itlbmiss", "thresh > .05", + "pmcstat -s ITLB_MISSES.WALK_DURATION -s CPU_CLK_UNHALTED.THREAD_P -s ITLB_MISSES.STLB_HIT_4K -w 1", + itlb_miss_broad }, +/*4*/ { "icachemiss", "thresh > .05", + "pmcstat -s ICACHE.MISSES --s CPU_CLK_UNHALTED.THREAD_P -w 1", + icache_miss_has }, +/*5*/ { "lcpstall", "thresh > .05", + "pmcstat -s ILD_STALL.LCP -s CPU_CLK_UNHALTED.THREAD_P -w 1", + lcp_stall }, +/*6*/ { "cache1", "thresh >= .1", + "pmcstat -s MEM_LOAD_UOPS_RETIRED.L3_MISS -s CPU_CLK_UNHALTED.THREAD_P -w 1", + cache1broad }, +/*7*/ { "cache2", "thresh >= .2", + "pmcstat -s MEM_LOAD_UOPS_RETIRED.L3_HIT -s CPU_CLK_UNHALTED.THREAD_P -w 1", + cache2broad }, +/*8*/ { "contested", "thresh >= .05", + "pmcstat -s MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_HITM -s CPU_CLK_UNHALTED.THREAD_P -s MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_MISS -w 1", + contestedbroad }, +/*9*/ { "datashare", "thresh >= .05", + "pmcstat -s MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_HIT -s CPU_CLK_UNHALTED.THREAD_P -w 1", + datasharing_has }, +/*10*/ { "blockstorefwd", "thresh >= .05", + "pmcstat -s LD_BLOCKS_STORE_FORWARD -s CPU_CLK_UNHALTED.THREAD_P -w 1", + blockstoreforward }, +/*11*/ { "aliasing_4k", "thresh >= .1", + "pmcstat -s LD_BLOCKS_PARTIAL.ADDRESS_ALIAS -s CPU_CLK_UNHALTED.THREAD_P -w 1", + aliasing_broad }, +/*12*/ { "dtlbmissload", "thresh >= .1", + "pmcstat -s DTLB_LOAD_MISSES.STLB_HIT -s DTLB_LOAD_MISSES.WALK_DURATION -s CPU_CLK_UNHALTED.THREAD_P -w 1", + dtlb_missload }, +/*13*/ { "br_miss", "thresh >= .2", + "pmcstat -s CPU_CLK_UNHALTED.THREAD_P -s BR_MISP_RETIRED.ALL_BRANCHES -s MACHINE_CLEARS.CYCLES -s UOPS_ISSUED.ANY -s UOPS_RETIRED.RETIRE_SLOTS -s INT_MISC.RECOVERY_CYCLES -w 1", + br_mispredict_broad }, +/*14*/ { "clears", "thresh >= .02", + "pmcstat -s MACHINE_CLEARS.CYCLES -s MACHINE_CLEARS.MEMORY_ORDERING -s MACHINE_CLEARS.SMC -s MACHINE_CLEARS.MASKMOV -s CPU_CLK_UNHALTED.THREAD_P -w 1", + clears_broad }, +/*15*/ { "fpassist", "look for a excessive value", + "pmcstat -s FP_ASSIST.ANY -s INST_RETIRED.ANY_P -w 1", + fpassists }, +/*16*/ { "otherassistavx", "look for a excessive value", + "pmcstat -s OTHER_ASSISTS.AVX_TO_SSE -s CPU_CLK_UNHALTED.THREAD_P -w 1", + otherassistavx }, +/*17*/ { "microassist", "thresh >= .2", + "pmcstat -s IDQ.MS_UOPS,cmask=1 -s CPU_CLK_UNHALTED.THREAD_P -s UOPS_ISSUED.ANY -s UOPS_RETIRED.RETIRE_SLOTS -w 1", + microassist_broad }, +}; + +static void set_sandybridge(void) { strcpy(the_cpu.cputype, "SandyBridge PMC"); @@ -1558,6 +1921,15 @@ set_haswell(void) } static void +set_broadwell(void) +{ + strcpy(the_cpu.cputype, "HASWELL PMC"); + the_cpu.number = BROADWELL_COUNT; + the_cpu.ents = broadwell; + the_cpu.explain = explain_name_broad; +} + +static void set_expression(char *name) { int found = 0, i; @@ -1577,10 +1949,6 @@ set_expression(char *name) } } - - - - static int validate_expression(char *name) { @@ -1813,7 +2181,7 @@ process_file(char *filename) /* Nothing we can do */ printf("Nothing to do -- no counters built\n"); if (filename) { - fclose(io); + fclose(io); } else { my_pclose(io, pid_of_command); } @@ -1992,6 +2360,23 @@ get_cpuid_set(void) printf("Intel HASWELL\n"); set_haswell(); break; + + case 0x4e: + case 0x5e: + printf("Intel SKY-LAKE\n"); + goto not_supported; + break; + case 0x3D: + case 0x47: + printf("Intel BROADWELL\n"); + set_broadwell(); + break; + case 0x4f: + case 0x56: + printf("Intel BROADWEL (Xeon)L\n"); + set_broadwell(); + break; + case 0x4D: /* Per Intel document 330061-001 01/2014. */ printf("Intel ATOM_SILVERMONT\n");