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Date: Thu, 22 May 2014 01:23:18 +0200
From: Andi Kleen <andi@firstfloor.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andi Kleen <andi@firstfloor.org>, Andy Lutomirski <luto@amacapital.net>,
        Steven Rostedt <rostedt@goodmis.org>,
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        Thomas Gleixner <tglx@linutronix.de>, Borislav Petkov <bp@alien8.de>
Subject: Re: [RFC] x86_64: A real proposal for iret-less return to kernel
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> Hardware-interrupts during kernel are actually fairly common under
> network-intensive loads, even outside of idle (but idle is admittedly
> likely *the* most common one). Many network loads are fairly
> kernel-intensive.

For network workloads we can arbitarily coalesce interrupts or just use NAPI
to lower the costs.  No need to optimize network interrupts too much.

-Andi