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From: Arnd Bergmann <arnd@arndb.de>
To: "Stephan Müller" <smueller@chronox.de>
Cc: "Theodore Ts'o" <tytso@mit.edu>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Jason A. Donenfeld" <jason@zx2c4.com>,
	linux-crypto@vger.kernel.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH v12 3/4] Linux Random Number Generator
Date: Fri, 21 Jul 2017 17:09:11 +0200	[thread overview]
Message-ID: <CAK8P3a2+t1Wy1vgz-ie4h=Epsdy2hrM2ycmEsFptwNqwJ57CCQ@mail.gmail.com> (raw)
In-Reply-To: <2787001.lEj6P09Sfm@tauon.chronox.de>

On Fri, Jul 21, 2017 at 10:57 AM, Stephan Müller <smueller@chronox.de> wrote:
> Am Freitag, 21. Juli 2017, 05:08:47 CEST schrieb Theodore Ts'o:

>> Um, the timer is the largest number of interrupts on my system.  Compare:
>>
>>             CPU0       CPU1       CPU2       CPU3
>>  LOC:    6396552    6038865    6558646    6057102   Local timer interrupts
>>
>> with the number of disk related interrupts:
>>
>>  120:      21492     139284      40513    1705886   PCI-MSI 376832-edge
>> ahci[0000:00:17.0]
>
> They seem to be not picked up with the add_interrupt_randomness function.

On x86, the local APIC timer has some special handling in
arch/x86/entry/entry_64.S that does not go through handle_irq_event().

I would assume that this is different when you boot with the "noapictimer"
option and use the hpet clockevent instead.

On other architectures, the timer interrupt is often handled as a regular
IRQ as well.

       Arnd

  reply	other threads:[~2017-07-21 15:09 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-18  7:57 [RFC PATCH v12 0/4] /dev/random - a new approach Stephan Müller
2017-07-18  7:57 ` [RFC PATCH v12 1/4] crypto: make Jitter RNG directly accessible Stephan Müller
2017-07-18  8:30   ` Greg Kroah-Hartman
2017-07-18  8:40     ` Stephan Müller
2017-07-18  8:49       ` Greg Kroah-Hartman
2017-07-18  8:53         ` Stephan Müller
2017-07-18  9:02         ` Arnd Bergmann
2017-07-18  9:10           ` Stephan Müller
2017-07-18  9:16             ` Arnd Bergmann
2017-07-18  9:17               ` Stephan Müller
2017-07-18  7:58 ` [RFC PATCH v12 2/4] random: conditionally compile code depending on LRNG Stephan Müller
2017-07-18  8:13   ` Arnd Bergmann
2017-07-18  8:37     ` Stephan Müller
2017-07-18  8:47       ` Arnd Bergmann
2017-07-18  8:50         ` Stephan Müller
2017-07-18  7:59 ` [RFC PATCH v12 3/4] Linux Random Number Generator Stephan Müller
2017-07-18  8:32   ` Greg Kroah-Hartman
2017-07-18  8:45     ` Stephan Müller
2017-07-18  8:52       ` Greg Kroah-Hartman
2017-07-18 14:37         ` Stephan Müller
2017-07-18 21:08           ` Theodore Ts'o
2017-07-19  1:00             ` Sandy Harris
2017-07-19  1:51               ` Theodore Ts'o
2017-07-19  6:25                 ` Stephan Müller
2017-07-30 10:44                 ` Pavel Machek
2017-07-23 18:05               ` Sandy Harris
2017-07-23 21:47                 ` Theodore Ts'o
2017-07-19  6:22             ` Stephan Müller
2017-07-19  6:34               ` Greg Kroah-Hartman
2017-07-19 17:26               ` Theodore Ts'o
2017-07-20 19:00                 ` Stephan Müller
2017-07-21  3:08                   ` Theodore Ts'o
2017-07-21  8:57                     ` Stephan Müller
2017-07-21 15:09                       ` Arnd Bergmann [this message]
2017-07-21 15:17                         ` Stephan Müller
2017-07-18  8:52       ` Greg Kroah-Hartman
2017-07-18  7:59 ` [RFC PATCH v12 4/4] LRNG - enable compile Stephan Müller
2017-07-18  8:51   ` Arnd Bergmann
2017-07-18  8:56     ` Stephan Müller
2017-07-21 11:30 [RFC PATCH v12 3/4] Linux Random Number Generator Jeffrey Walton

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