linux-kernel - Re: [PATCH] drivers/net: remove network drivers' last few uses of IRQF_SAMPLE

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Date:	Thu, 15 May 2008 13:01:36 -0700
From:	"Chris Peterson" <cpeterso@...terso.com>
To:	"Jeff Garzik" <jeff@...zik.org>
Cc:	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	"Rick Jones" <rick.jones2@...com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/net: remove network drivers' last few uses of IRQF_SAMPLE_RANDOM

Please correct me if I'm wrong, but this thread's conclusions seem to be:

* network interrupts are an inappropriate source of entropy (see my patch)
* headless servers need entropy, but should seek a better solution,
such as EGD, hardware RNG, or other kernel entropy sources (but that
is a separate task)
* TPM RNG is a separate task and, if implemented, should be in
drivers/char/hw_random/


chris


On Thu, May 15, 2008 at 12:21 PM, Jeff Garzik <jeff@...zik.org> wrote:
> Kok, Auke wrote:
>>
>> How about the non-NAPI and non-throttled case? I would argue that without
>> any irq
>> mitigation we can still use SA_RANDOM. Many (e.g. embedded) devices will
>> want some
>
> When was the last time we added a new driver for new hardware, and it didn't
> support NAPI and/or hw mitigation?  They are few and far between, and
> getting ever more rare.
>
>
>> extra form of entropy, and providing them it in this form will be very
>> beneficial
>> as these devices more commonly have no other form of entropy anymore.
>
> "no other form of entropy"?   See examples in this thread.
>
>        Jeff
>
>
>
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