linux-kernel - RE: [PATCH 1/3] mce: Add a msg string to the MCE tracepoint

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 29 Feb 2012 17:33:51 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Borislav Petkov <bp@...64.org>
CC:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	EDAC devel <linux-edac@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/3] mce: Add a msg string to the MCE tracepoint

> IOW, we want to assume that cores 0, 1, 2 ... k-1 are on node 0; k, k+1
> ... 2k-1 belong to node 1, etc., where k is the number of cores on a
> socket and thus we have a regular core enumeration on the box.

Sounds dubious:

Booting Node   0, Processors  #1 #2 #3 #4 #5 #6 #7 Ok.
Booting Node   1, Processors  #8 #9 #10 #11 #12 #13 #14 #15 Ok.
Booting Node   0, Processors  #16 #17 #18 #19 #20 #21 #22 #23 Ok.
Booting Node   1, Processors  #24 #25 #26 #27 #28 #29 #30 #31
Brought up 32 CPUs

Now those are logical cpu numbers, and we brought up the first HT
thread on each core first, and then came around for a 2nd pass
bringing up the other HT thread.  This order is determined by
how the BIOS lists the cpus (and in this case it seems to be
doing so according to recommendations) - so here our core numbers
will match what you said. But the BIOS could do something
strange and list logical cpus alternating between sockets. In
which case cores 0, 2, 4, 6 ... would be on node 0, and cores
1, 3, 5, 7, ... on node 1.

-Tony
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/