linux-kernel - Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

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:	Fri, 18 May 2007 19:06:04 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Kumar Gala <galak@...nel.crashing.org>, tglx@...utronix.de,
	mingo@...e.hu, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

Daniel Walker wrote:

>>I haven't looked at all the new clock/timer code, is there any  
>>utility in having support for more than one clock source?

> There is if the main clocksource has some issues where it can't be used.

    You mean, having more than one clocksource is *useful* in this case?

> On x86 there are lots of different issues with the clocks, so they have
> to get switches once in a while. For instance, if the TSC changes
> frequencies then it can't be used, or if the TSC stops in different
> power states , it can't be used.. 

    Yeah, and there's the rating systems for both clock sources/events.

> Anything like that on PowerPC?

    Well, the decrementer frequency may change, at least in theory (if the bus 
clock changes).

> Daniel

WBR, Sergei
-
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/