delorie.com/archives/browse.cgi | search |
X-Recipient: | archive-cygwin AT delorie DOT com |
DomainKey-Signature: | a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id |
:list-unsubscribe:list-subscribe:list-archive:list-post | |
:list-help:sender:from:subject:to:message-id:date:mime-version | |
:content-type:content-transfer-encoding; q=dns; s=default; b=G+b | |
xyGoAshVUaUT0pyTECflayaUXSUho2b62us/3H1ClateWn/eyRL3KR3ORkW2m6ue | |
leqh8qELq0QmnEAE5CAVIjm3pYrwwWwymi3c1hDx7LLGDDp+yr3p41BDMsKz+7nO | |
RU+Z8v+uDMPWOCk/i3ZbJ3x6woRfxXt3hK6HW3Gs= | |
DKIM-Signature: | v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id |
:list-unsubscribe:list-subscribe:list-archive:list-post | |
:list-help:sender:from:subject:to:message-id:date:mime-version | |
:content-type:content-transfer-encoding; s=default; bh=wu8GduzDy | |
ZgAyblEepBjFWkzZJ0=; b=ng8pt6bbJfoHey9erOX/nsBGz2HlrVeC2c2WOBBf6 | |
9IwNgma8ytLhjO0z7Q9TAzLNXOHNweRc23KEKIFpsViKFYQhb/QDRQ4H3dCU7yG6 | |
6nhPimzJszFAnKv9yAbLz/bR/Ie0YYhNten3XNpLZB7jDkm0puxA0v7ZUy0p/wki | |
QU= | |
Mailing-List: | contact cygwin-help AT cygwin DOT com; run by ezmlm |
List-Id: | <cygwin.cygwin.com> |
List-Subscribe: | <mailto:cygwin-subscribe AT cygwin DOT com> |
List-Archive: | <http://sourceware.org/ml/cygwin/> |
List-Post: | <mailto:cygwin AT cygwin DOT com> |
List-Help: | <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs> |
Sender: | cygwin-owner AT cygwin DOT com |
Mail-Followup-To: | cygwin AT cygwin DOT com |
Delivered-To: | mailing list cygwin AT cygwin DOT com |
Authentication-Results: | sourceware.org; auth=none |
X-Virus-Found: | No |
X-Spam-SWARE-Status: | No, score=-0.2 required=5.0 tests=AWL,BAYES_40,FREEMAIL_FROM,KAM_ASCII_DIVIDERS,RCVD_IN_DNSWL_NONE,SPF_PASS autolearn=no version=3.3.2 |
X-HELO: | mail-wg0-f45.google.com |
X-Received: | by 10.180.94.39 with SMTP id cz7mr3548978wib.66.1435066779175; Tue, 23 Jun 2015 06:39:39 -0700 (PDT) |
From: | Marco Atzeri <marco DOT atzeri AT gmail DOT com> |
Subject: | cpuinfo cache size |
To: | "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com> |
Message-ID: | <55896193.2080307@gmail.com> |
Date: | Tue, 23 Jun 2015 15:39:31 +0200 |
User-Agent: | Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.0.1 |
MIME-Version: | 1.0 |
X-IsSubscribed: | yes |
Hi Corinna, for a porting of a math lib to cygwin we are trying to obtain the same information of sysconf(_SC_LEVEL1_DCACHE_SIZE) sysconf(_SC_LEVEL2_CACHE_SIZE) sysconf(_SC_LEVEL3_CACHE_SIZE) sysconf(_SC_LEVEL4_CACHE_SIZE) but of course none of them is implemented in cygwin. The /proc/cpuinfo contains : ------------------------------------------------------------------ processor : same 0 to 3 vendor_id : GenuineIntel cpu family : 6 model : 58 model name : Intel(R) Core(TM) i5-3320M CPU @ 2.60GHz stepping : 9 cpu MHz : 2594.000 cache size : 256 KB fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe pni dtes64 monitor ds_ cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 x2apic popcnt aes xsave o sxsave avx f16c rdrand lahf_lm ida arat epb xsaveopt pln pts dtherm fsgsbase sme p erms TLB size : 0 4K pages clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: ------------------------------------------------------------------ Looking on the code it seems that for maxe >= 0x80000006 cache_size reported on cpuinfo is calculated using L1 and immediately after overwritten with L2 value. --------- winsup/cygwin/fhandler_proc.cc -------------------- if (maxe >= 0x80000005) /* L1 Cache and TLB Identifiers. */ { uint32_t data_cache, inst_cache; cpuid (&unused, &unused, &data_cache, &inst_cache, 0x80000005); -> cache_size = (inst_cache >> 24) + (data_cache >> 24); tlb_size = 0; } if (maxe >= 0x80000006) /* L2 Cache and L2 TLB Identifiers. */ { uint32_t tlb, l2; cpuid (&unused, &tlb, &l2, &unused, 0x80000006); -> cache_size = l2 >> 16; tlb_size = ((tlb >> 16) & 0xfff) + (tlb & 0xfff); } ----------------------------------------------------------------- Should be possible to have both info available ? Any idea how to obtain the other cache infos ? Using a third part tool CPU-Z version 1.72.1.x64 I know that my architecture should be: Number of processors 1 Number of threads 4 Processor 0 -- Core 0 -- Thread 0 0 -- Thread 1 1 -- Core 1 -- Thread 0 2 -- Thread 1 3 L1 Data cache 2 x 32 KBytes, 8-way set associative, 64-byte line size L1 Instruction cache 2 x 32 KBytes, 8-way set associative, 64-byte line size L2 cache 2 x 256 KBytes, 8-way set associative, 64-byte line size L3 cache 3 MBytes, 12-way set associative, 64-byte line size Thanks in advance Marco -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
webmaster | delorie software privacy |
Copyright © 2019 by DJ Delorie | Updated Jul 2019 |