linux-kernel - Re: [tip:timers/ntp] ntp: adjust SHIFT

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 for Android: free password hash cracker in your pocket

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

Message-ID: <4A246D0B.40204@redhat.com>
Date:	Mon, 01 Jun 2009 20:06:35 -0400
From:	Rik van Riel <riel@...hat.com>
To:	John Stultz <johnstul@...ibm.com>
CC:	Ingo Molnar <mingo@...e.hu>, mingo@...hat.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	tglx@...utronix.de, linux-tip-commits@...r.kernel.org,
	Miroslav Lichvar <mlichvar@...hat.com>
Subject: Re: [tip:timers/ntp] ntp: adjust SHIFT_PLL to improve NTP convergence

John Stultz wrote:
> On Tue, 2009-06-02 at 01:22 +0200, Ingo Molnar wrote:

>> I might be missing something here - but Linux converging faster 
>> seems like a genuinely good thing. What non-Linux problem could 
>> there be? Linux's convergence is really Linux's private issue. 
> 
> Yea. It does seem that way. Miroslav can likely expand on the issue to
> help clarify, but as I understand it, the example is if you have a
> number of systems that are peers in an NTP network. All of them are
> using the same userland NTP daemon. However, if the rate of change that
> corrections are applied is different in half of them, you will have
> problems getting all the systems to converge together. 

Would this not be true already, because the convergence
of Linux system suddenly became a lot slower in 2.6.19?

Damned if we do, damned if we don't - except the new
behaviour introduced by your patches is nicer.

-- 
All rights reversed.
--
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/