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Re: [RFC PATCH v12 3/4] Linux Random Number Generator

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Am Freitag, 21. Juli 2017, 17:09:11 CEST schrieb Arnd Bergmann:

Hi Arnd,

> 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.

Thank you for the hint.

Yet, I would think that timer interrupts can be identified by 
add_interrupt_randomness, either by the IRQ or the stuck test that was is 
suggested with the LRNG patch set.

Ciao
Stephan

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Re: [RFC PATCH v12 3/4] Linux Random Number Generator Stephan Müller <smueller@chronox.de> - 2017-07-18 16:40 +0200
  Re: [RFC PATCH v12 3/4] Linux Random Number Generator Theodore Ts'o <tytso@mit.edu> - 2017-07-18 23:10 +0200
    Re: [RFC PATCH v12 3/4] Linux Random Number Generator Sandy Harris <sandyinchina@gmail.com> - 2017-07-19 03:10 +0200
      Re: [RFC PATCH v12 3/4] Linux Random Number Generator Theodore Ts'o <tytso@mit.edu> - 2017-07-19 04:00 +0200
        Re: [RFC PATCH v12 3/4] Linux Random Number Generator Stephan Müller <smueller@chronox.de> - 2017-07-19 08:30 +0200
        Re: [RFC PATCH v12 3/4] Linux Random Number Generator Pavel Machek <pavel@ucw.cz> - 2017-07-30 12:50 +0200
      Re: [RFC PATCH v12 3/4] Linux Random Number Generator Sandy Harris <sandyinchina@gmail.com> - 2017-07-23 20:10 +0200
        Re: [RFC PATCH v12 3/4] Linux Random Number Generator Theodore Ts'o <tytso@mit.edu> - 2017-07-23 23:50 +0200
    Re: [RFC PATCH v12 3/4] Linux Random Number Generator Stephan Müller <smueller@chronox.de> - 2017-07-19 08:30 +0200
      Re: [RFC PATCH v12 3/4] Linux Random Number Generator Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-07-19 08:40 +0200
      Re: [RFC PATCH v12 3/4] Linux Random Number Generator Theodore Ts'o <tytso@mit.edu> - 2017-07-19 19:30 +0200
        Re: [RFC PATCH v12 3/4] Linux Random Number Generator Stephan Müller <smueller@chronox.de> - 2017-07-20 21:10 +0200
          Re: [RFC PATCH v12 3/4] Linux Random Number Generator Theodore Ts'o <tytso@mit.edu> - 2017-07-21 05:10 +0200
            Re: [RFC PATCH v12 3/4] Linux Random Number Generator Stephan Müller <smueller@chronox.de> - 2017-07-21 11:00 +0200
              Re: [RFC PATCH v12 3/4] Linux Random Number Generator Stephan Müller <smueller@chronox.de> - 2017-07-21 17:20 +0200
              Re: [RFC PATCH v12 3/4] Linux Random Number Generator Arnd Bergmann <arnd@arndb.de> - 2017-07-21 17:20 +0200

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