linux-kernel - Re: [RFC][PATCH] tsc_khz= boot option to avoid TSC calibration variance

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] [day] [month] [year] [list]

Date:	11 May 2009 02:54:24 -0400
From:	"George Spelvin" <linux@...izon.com>
To:	johnstul@...ibm.com, linux@...izon.com
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	ulrich.windl@...uni-regensburg.de, williams@...hat.com,
	zippel@...ux-m68k.org
Subject: Re: [RFC][PATCH] tsc_khz= boot option to avoid TSC calibration variance

Just as a data point, I have this patch running on two PPS-synced
NTP servers with apparent success.  After thinking through the sign
conventions carefully, (if NTP reports a that it is applying a positive
clock frequency adjustment, the TSC frequency should be reduced by that
amount), I now have the NTP frequency offset within a couple PPM of 0.

Thanks for the patch!
--
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/