On Mon, 13 Jun 2011, Venkatesh Pallipadi wrote:
> On Mon, Jun 13, 2011 at 3:06 PM, Jarod Wilson wrote:
> > TSC is high enough resolution that we can use its low-order byte to
> > stir new data into the random number generator entropy pool.
>
> >From what I vaguely remember from years past, rdt
On Tue, 2011-06-14 at 16:04 -0400, Kent Borg wrote:
> Matt Mackall wrote:
> > [network adapters are] a great source of potential entropy, a bad
> > source of guaranteed entropy. The current RNG tries to do
> > accounting on the latter. Accounting on the former is extremely
> > suspect.
>
> So
Matt Mackall wrote:
> [network adapters are] a great source of potential entropy, a bad
> source of guaranteed entropy. The current RNG tries to do
> accounting on the latter. Accounting on the former is extremely
> suspect.
So we need a patch that:
- Deletes the IRQF_SAMPLE_RANDOM mention in fe
On 06/13/2011 04:10 PM, Matt Mackall wrote:
>
> Well the issue is that samples are going to be roughly aligned to some
> multiple of the bus frequency. If an interrupt occurs on bus cycle X,
> this code will be hit at roughly TSC cycle X*M+d.
>
>> This is correct; at the very least I would multip
On Tue, 2011-06-14 at 13:48 -0400, Kent Borg wrote:
> Matt Mackall wrote:
> > Kent Borg wrote:
> >>So network entropy is being eradicated, and nothing is being done to
> >>replace it.
> >
> >Nothing is being done is a more accurate summary of the situation.
>
>
> So the feature-removal-sched
Matt Mackall wrote:
> Kent Borg wrote:
>>So network entropy is being eradicated, and nothing is being done to
>>replace it.
>
>Nothing is being done is a more accurate summary of the situation.
So the feature-removal-schedule.txt entry about IRQF_SAMPLE_RANDOM is
obsolete?
(Then the trend fro
On Tue, 2011-06-14 at 08:39 -0400, Kent Borg wrote:
> H. Peter Anvin wrote:
> > Those already are doing this.
>
> They used to via IRQF_SAMPLE_RANDOM, but these are being removed
> (according to Documentation/feature-removal-schedule.txt). In 2.6.39 I
> can only find 10 remaining instances, ou
On Mon, 2011-06-13 at 15:36 -0700, H. Peter Anvin wrote:
> On 06/13/2011 03:27 PM, Venkatesh Pallipadi wrote:
> > On Mon, Jun 13, 2011 at 3:06 PM, Jarod Wilson wrote:
> >> TSC is high enough resolution that we can use its low-order byte to
> >> stir new data into the random number generator entrop
H. Peter Anvin wrote:
On 06/13/2011 05:39 PM, Kent Borg wrote:
I was assuming that drivers, responding to an interrupt from some
external event, would want to make this call.
Such as a network driver.
Those already are doing this.
Two points:
1. Why look at the high-order bits? How are the
H. Peter Anvin wrote:
> Those already are doing this.
They used to via IRQF_SAMPLE_RANDOM, but these are being removed
(according to Documentation/feature-removal-schedule.txt). In 2.6.39 I
can only find 10 remaining instances, out of many more network drivers.
The alternative is supposed to
On 06/13/2011 05:39 PM, Kent Borg wrote:
> I was assuming that drivers, responding to an interrupt from some
> external event, would want to make this call.
> Such as a network driver.
Those already are doing this.
> Two points:
>
> 1. Why look at the high-order bits? How are they going to have
H. Peter Anvin wrote:
> However, the big issue with this is that it's recursive... what
causes this to
> be invoked... probably an interrupt, which is going to have been
> invoked by a timer, quite possible the TSC deadline timer. Oops.
I was assuming that drivers, responding to an interrupt fr
Venkatesh Pallipadi wrote:
On Mon, Jun 13, 2011 at 3:06 PM, Jarod Wilson wrote:
TSC is high enough resolution that we can use its low-order byte to
stir new data into the random number generator entropy pool.
From what I vaguely remember from years past, rdtsc, especially last
few bits of
On 06/13/2011 03:27 PM, Venkatesh Pallipadi wrote:
> On Mon, Jun 13, 2011 at 3:06 PM, Jarod Wilson wrote:
>> TSC is high enough resolution that we can use its low-order byte to
>> stir new data into the random number generator entropy pool.
>
> From what I vaguely remember from years past, rdtsc,
Venkatesh Pallipadi wrote:
On Mon, Jun 13, 2011 at 3:06 PM, Jarod Wilson wrote:
TSC is high enough resolution that we can use its low-order byte to
stir new data into the random number generator entropy pool.
From what I vaguely remember from years past, rdtsc, especially last
few bits of it
On Mon, Jun 13, 2011 at 3:06 PM, Jarod Wilson wrote:
> TSC is high enough resolution that we can use its low-order byte to
> stir new data into the random number generator entropy pool.
>From what I vaguely remember from years past, rdtsc, especially last
few bits of it are not very good as rando
TSC is high enough resolution that we can use its low-order byte to
stir new data into the random number generator entropy pool.
CC: Matt Mackall
CC: "Venkatesh Pallipadi (Venki)"
CC: Thomas Gleixner
CC: Ingo Molnar
CC: John Stultz
CC: Herbert Xu
CC: "David S. Miller"
Signed-off-by: Jarod W
17 matches
Mail list logo
