From: Oliver Xymoron <oxymoron@waste.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Problem with random.c and PPC
Date: Fri, 16 Aug 2002 11:33:49 -0500 [thread overview]
Message-ID: <20020816163349.GG5418@waste.org> (raw)
In-Reply-To: <ajhlp8$qse$1@cesium.transmeta.com>
On Thu, Aug 15, 2002 at 06:50:32PM -0700, H. Peter Anvin wrote:
> Followup to: <20020815210449.GA26993@opus.bloom.county>
> By author: Tom Rini <trini@kernel.crashing.org>
> In newsgroup: linux.dev.kernel
> >
> > Ah, thanks. In that case, no. It doesn't look like the input-layer USB
> > keyboards contribute to entropy (but mice do), and I don't think the ADB
> > ones do. I'll take a crack at adding this to keyboards monday maybe.
> >
>
> Be careful... USB devices are *always* going to speak at the same
> place in the USB cycle... I believe that is 1 ms. Thus,
> submillisecond resolution is *not* random.
Currently not a problem for anyone except X86, as they'll only use HZ
resolution. But the same problem exists on regular mice and keyboards,
which are typically scanned for events at a fixed rate.
This is just the tip of the iceberg for problems with entropy
accounting. I've got some free time today, I'll try to clean up my
patches for this.
--
"Love the dolphins," she advised him. "Write by W.A.S.T.E.."
next prev parent reply other threads:[~2002-08-16 16:30 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-15 15:14 Problem with random.c and PPC henrique
2002-08-15 18:25 ` Andreas Dilger
2002-08-15 19:03 ` Tom Rini
2002-08-15 19:59 ` Andreas Dilger
2002-08-15 21:04 ` Tom Rini
2002-08-16 1:50 ` H. Peter Anvin
2002-08-16 16:33 ` Oliver Xymoron [this message]
2002-08-16 16:28 ` Oliver Xymoron
[not found] ` <20020816170126.GD26993@opus.bloom.county>
2002-08-16 17:15 ` Oliver Xymoron
-- strict thread matches above, loose matches on Subject: below --
2002-08-15 16:10 henrique
2002-08-16 10:00 Jon Burgess
2002-08-16 19:52 ` Oliver Xymoron
2002-08-16 17:51 ` henrique
2002-08-16 21:21 ` Ruth Ivimey-Cook
2002-08-17 0:47 ` Oliver Xymoron
2002-08-17 0:45 ` Oliver Xymoron
2002-08-17 6:05 ` Andreas Dilger
2002-08-17 7:23 ` Oliver Xymoron
2002-08-17 9:09 ` Andreas Dilger
2002-08-17 16:56 ` Oliver Xymoron
2002-08-19 9:29 ` Marco Colombo
2002-08-19 14:02 ` Oliver Xymoron
2002-08-19 15:11 ` Marco Colombo
2002-08-19 15:29 ` Oliver Xymoron
2002-08-19 16:20 ` Marco Colombo
2002-08-19 16:33 ` Oliver Xymoron
2002-08-19 20:23 ` Marco Colombo
2002-08-22 3:16 ` David Wagner
2002-08-16 20:52 ` Chris Friesen
2002-08-17 0:29 ` Oliver Xymoron
2002-08-22 3:19 ` David Wagner
2002-08-22 15:40 ` Chris Friesen
2002-08-22 17:25 ` Remco Post
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