From: Pavel Machek <pavel@ucw.cz>
To: Matt Mackall <mpm@selenic.com>
Cc: "David S. Miller" <davem@davemloft.net>,
tytso@mit.edu, mrmacman_g4@mac.com, akpm@osdl.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 7/14] random: Remove SA_SAMPLE_RANDOM from network drivers
Date: Mon, 8 May 2006 17:21:12 +0000 [thread overview]
Message-ID: <20060508172111.GA5266@ucw.cz> (raw)
In-Reply-To: <20060508140500.GZ15445@waste.org>
Hi!
> > What do other platforms without a TSC do?
>
> Using get_cycles() for /dev/random is new as of 2.6. Before that, we
> were directly calling rdtsc on x86 alone. 10msec resolution is fine
> for plenty of sources.
For what devices are timestamps still 'random/unobservable' in 10msec
range?
Maybe keyboard... but no, keyboard has autorepeat and can be observed
remotely with 10msec accuracy in many cases. (telnet to bbs?)
Disk requests take less than 10msec.
It is trivial to measure packets with 10msec accuracy.
Mouse will generate many events within 10msec when user actually uses
it.
...so, what devices are still random with 10msec sampling?
--
Thanks for all the (sleeping) penguins.
next prev parent reply other threads:[~2006-05-08 17:21 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-05 16:42 [PATCH 1/14] random: Remove SA_SAMPLE_RANDOM from floppy driver Matt Mackall
2006-05-05 16:42 ` [PATCH 2/14] random: Remove redundant SA_SAMPLE_RANDOM from NinjaSCSI Matt Mackall
2006-05-05 16:42 ` [PATCH 3/14] random: Make CCISS use add_disk_randomness Matt Mackall
2006-05-05 16:42 ` [PATCH 4/14] random: Change cpqarray to " Matt Mackall
2006-05-05 16:42 ` [PATCH 5/14] random: Remove bogus SA_SAMPLE_RANDOM from at91 compact flash driver Matt Mackall
2006-05-05 16:42 ` [PATCH 6/14] random: Remove redundant SA_SAMPLE_RANDOM from touchscreen drivers Matt Mackall
2006-05-05 16:42 ` [PATCH 9/14] random: Remove SA_SAMPLE_RANDOM from i2c drivers Matt Mackall
2006-05-05 16:42 ` [PATCH 11/14] random: Remove UML usage of SA_SAMPLE_RANDOM Matt Mackall
2006-05-05 16:42 ` [PATCH 7/14] random: Remove SA_SAMPLE_RANDOM from network drivers Matt Mackall
2006-05-05 17:13 ` Kyle Moffett
2006-05-05 17:24 ` Matt Mackall
2006-05-05 19:11 ` Theodore Tso
2006-05-05 20:30 ` Stephen Hemminger
2006-05-05 20:34 ` Matt Mackall
2006-05-06 11:55 ` Theodore Tso
2006-05-06 16:48 ` Matt Mackall
2006-05-06 17:29 ` Bernd Eckenfels
2006-05-06 18:05 ` Theodore Tso
2006-05-06 20:33 ` Matt Mackall
2006-05-07 0:17 ` David S. Miller
2006-05-07 1:22 ` Theodore Tso
2006-05-07 5:07 ` Matt Mackall
2006-05-08 21:58 ` Sami Farin
2006-05-24 22:47 ` Marcin Dalecki
2006-05-25 0:08 ` Theodore Tso
2006-05-31 19:29 ` Bill Davidsen
2006-05-07 0:08 ` David S. Miller
2006-05-07 4:59 ` Matt Mackall
2006-05-07 5:46 ` David S. Miller
2006-05-07 16:31 ` Matt Mackall
2006-05-07 13:13 ` Thiago Galesi
2006-05-07 16:00 ` Matt Mackall
2006-05-07 17:00 ` Thiago Galesi
2006-05-08 0:13 ` Theodore Tso
2006-05-08 2:55 ` Matt Mackall
2006-05-08 6:26 ` Pavel Machek
2006-05-08 7:07 ` David S. Miller
2006-05-08 14:05 ` Matt Mackall
2006-05-08 17:21 ` Pavel Machek [this message]
2006-05-08 17:27 ` Matt Mackall
2006-05-09 11:23 ` Pavel Machek
2006-05-11 10:05 ` Ph. Marek
2006-05-24 22:35 ` Marcin Dalecki
2006-05-05 21:10 ` David S. Miller
2006-05-05 23:03 ` Matt Mackall
2006-05-05 23:19 ` David S. Miller
2006-05-06 14:08 ` Folkert van Heusden
2006-05-06 15:19 ` Lee Revell
2006-05-07 10:35 ` Folkert van Heusden
2006-05-07 16:33 ` Matt Mackall
2006-05-05 16:42 ` [PATCH 10/14] random: Remove bogus SA_SAMPLE_RANDOM from mpc52xx serial driver Matt Mackall
2006-05-05 16:42 ` [PATCH 8/14] random: Remove SA_SAMPLE_RANDOM from USB gadget drivers Matt Mackall
2006-05-06 11:07 ` Denis Vlasenko
2006-05-06 18:16 ` David Brownell
2006-05-06 18:31 ` Matt Mackall
2006-05-05 16:42 ` [PATCH 13/14] random: Remove SA_SAMPLE_RANDOM from IRQ fastpath Matt Mackall
2006-05-05 16:42 ` [PATCH 14/14] random: Remove add_interrupt_randomness Matt Mackall
2006-05-05 16:42 ` [PATCH 12/14] random: Remove not very useful SA_SAMPLE_RANDOM from lubbock Matt Mackall
-- strict thread matches above, loose matches on Subject: below --
2006-05-08 7:38 [PATCH 7/14] random: Remove SA_SAMPLE_RANDOM from network drivers linux
2006-05-12 6:09 ` linux
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