linux-kernel - Re: What is the performance when using frame pointers in the kernel?

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Message-ID: <alpine.LRH.2.00.0912041422360.9567@twin.jikos.cz>
Date:	Fri, 4 Dec 2009 14:23:55 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Justin Piszcz <jpiszcz@...idpixels.com>,
	linux-kernel@...r.kernel.org
Subject: Re: What is the performance when using frame pointers in the
 kernel?

On Thu, 3 Dec 2009, Peter Zijlstra wrote:

> > What is the performance hit when the kernel is compiled with frame 
> > pointers?
> 
> build both kernels and run your favourite workload to find out.

But generally speaking, frame pointers impose quite some performance 
penalty indeed. lmbench syscall microbenchmark can give you some hint. I 
expect you'll see approx. 10% performance increase for various syscalls if 
you disable them, as that's what we have measured lately.

-- 
Jiri Kosina
SUSE Labs, Novell Inc.

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