Date: Mon, 12 Mar 2001 13:03:34 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Mark Murray <mark@grondar.za> Cc: current@FreeBSD.ORG Subject: Re: Ethernet entropy harvesting seriously pessimizes performance Message-ID: <200103122103.f2CL3YZ74166@earth.backplane.com> References: <200103121937.f2CJbmY72278@earth.backplane.com> <200103121944.f2CJiif91472@gratis.grondar.za>
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:Matt,
:
:At it is very obvious to me that you have not even looked at the new
:code, let alone run it, I suggest that you do both before further
:engaging in this conversation.
:
:M
:--
:Mark Murray
:Warning: this .sig is umop ap!sdn
I looked at it. I'm sorry, I don't see how your adjustments make
the code any better from an algorithmic point of view. As far as I
can tell, things can still run away and interrupts still have an
unnecessarily large fixed overhead when they call the
random_harvest_internal().
I don't understand what is so difficult about simply rate-limiting
the code at the proper point -- at the very beginning of the
call that the interrupt harvester makes, removing most of the fixed
overhead for the case where a system is getting a large number of
interrupts per second? Why are you going through loops to create
complex, sensitive code paths when a simple solution can be plopped
down and will work, SNAP, just like that?
-Matt
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