linux-kernel - Re: performance differences: "maxcpus=1" vs. "echo 0

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]

Message-ID: <20080325175716.GW2170@one.firstfloor.org>
Date:	Tue, 25 Mar 2008 18:57:16 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Wander Winkelhorst <w.winkelhorst@...il.com>
Cc:	Michael Meyer <mike65134@...oo.de>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: performance differences: "maxcpus=1" vs. "echo 0 > /sys/devices/system/cpu/cpu1/online"

> What kind of CPU are you using? Some Intel CPU's do "funny stuff",
> like dynamically overclocking itself when working on a single thread,
> or using all of the 2nd level cache instead of sharing it with the
> second core.

P0 should also work fine with cpu hotplug. At least in theory.

-Andi
--
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/