linux-kernel - Re: Why do we still have 32 bit counters? Interrupt counters overflow within 50 days

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: <1412418370.19330.10.camel@thorin>
Date:	Sat, 04 Oct 2014 12:26:09 +0200
From:	Bernd Petrovitsch <bernd@...rovitsch.priv.at>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Paul Bolle <pebolle@...cali.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: Why do we still have 32 bit counters? Interrupt counters
 overflow within 50 days

On Fre, 2014-10-03 at 07:23 -0500, Christoph Lameter wrote:
> On Fri, 3 Oct 2014, Paul Bolle wrote:
> 
> > dc -e "1 k 2 32 ^ 1000 / 86400 / p"
> > 49.7
> >
> > (That was the number I remembered from stories about a ancient Windows
> > lockup.)
> 
> Well yes, I used bc which discards the remainder on integer divides

Use `bc -l`;-)
----  snip  ----
2^32 / 1000 / 86400 
49.71026962962962962962
----  snip  ----

	Bernd
-- 
"I dislike type abstraction if it has no real reason. And saving
on typing is not a good reason - if your typing speed is the main
issue when you're coding, you're doing something seriously wrong."
    - Linus Torvalds

--
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/