linux-kernel - Re: [PATCH] Turn rdmsr, rdtsc into inline functions, clarify names

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: <p73k65kplt8.fsf@verdi.suse.de>
Date:	07 Aug 2006 18:12:03 +0200
From:	Andi Kleen <ak@...e.de>
To:	Vojtech Pavlik <vojtech@...e.cz>
Cc:	Andreas Mohr <andi@...x01.fht-esslingen.de>,
	Dmitry Torokhov <dtor@...ightbb.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Turn rdmsr, rdtsc into inline functions, clarify names

Vojtech Pavlik <vojtech@...e.cz> writes:

> On Mon, Aug 07, 2006 at 05:57:14PM +0200, Andi Kleen wrote:
> > > That way a driver could use
> > > 
> > > 	if (gtod_cpu_cycles_needed <= 500)
> > > 		gettimeofday();
> > > 	else
> > > 		funky_fast_workaround();
> > 
> > Sounds like overengineering to me. I prefer something simple.
> 
> I could as well benchmark gettimeofday() in the gameport init.

Except you can't because the only way to benchmark it would
be to use gettimeofday already and then you don't know
how much is overhead and what is the real time.

-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/