linux-kernel - Re: Dynamic configure max

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: <alpine.LFD.2.00.0907281522290.16740@localhost.localdomain>
Date:	Tue, 28 Jul 2009 15:25:12 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	Corrado Zoccolo <czoccolo@...il.com>
Cc:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Andreas Mohr <andi@...as.de>,
	LKML <linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org
Subject: Re: Dynamic configure max_cstate


> Entering a deep C state can cause strange things to timers: some of
> them, especially tsc, become unreliable.

The Nehalem family CPU has a non-stop constant-frequency TSC.

The measurements that Yanmin quotes show that the TSC
is the lowest overhead timesource in the system.

thanks,
Len Brown, Intel Open Source Technology Center
--
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/