linux-kernel - Re: [RFC] x86_64: A real proposal for iret-less return to kernel

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Message-ID: <20140521232318.GP1873@two.firstfloor.org>
Date:	Thu, 22 May 2014 01:23:18 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Andy Lutomirski <luto@...capital.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [RFC] x86_64: A real proposal for iret-less return to kernel

> 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

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