linux-kernel - Why /proc/cpuinfo doesn't print L1,L2,L3 caches?

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Message-ID: <998d0e4a0803251439u4bf09fb1ye568fc1970b0200f@mail.gmail.com>
Date:	Tue, 25 Mar 2008 22:39:39 +0100
From:	"J.C. Pizarro" <jcpiza@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: Why /proc/cpuinfo doesn't print L1,L2,L3 caches?

$ cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 47
model name      : AMD Athlon(tm) 64 Processor 3200+
...
cache size      : 512 KB
...

The cache size is currently misinformed. It's not the real size because
it's 64+64+512 KiB = 640 KiB, not 512 KB.

How can i know what hw-caches use the processors?
The current kernel doesn't know well what hw-caches uses.

The good proposal is by example (the data below are not real):
* In old AMD Athlon64:

cache L1        : 64 KiB I + 64 KiB D, 64 B line, direct way, ...
cache L2        : 512 KiB I+D-shared, exclusive, 128 associative way, ...
cache L3        : none

* In Intel Core Duo:
processor       : 0
cache L1        : 32 KiB I + 32 KiB D, 64 B line, direct way, ...
cache L2        : 2048 KiB Cores-shared, inclusive, 128 associative way, ...
cache L3        : none

processor       : 1
cache L1        : 32 KiB I + 32 KiB D, 64 B line, direct way, ...
cache L2        : 2048 KiB cores-shared, inclusive, 128 associative way, ...
cache L3        : none

* In Quad:
processor       : 0
cache L1        : 32 KiB I + 32 KiB D, 64 B line, direct way, ...
cache L2        : 2048+2048 KiB pair-cores-shared, inclusive, 128
associative way, ...
cache L3        : none
...
processor       : 3
cache L1        : 32 KiB I + 32 KiB D, 64 B line, direct way, ...
cache L2        : 2048+2048 KiB pair-cores-shared, inclusive, 128
associative way, ...
cache L3        : none

It above is an example, put your symbols to /proc/cpuinfo in a
convenient manner.

   Good bye ;)
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