Messages in this thread | | | Date | Sat, 5 Dec 2009 08:02:49 +0100 | From | Ingo Molnar <> | Subject | Re: What is the performance when using frame pointers in the kernel? |
| |
* Justin Piszcz <jpiszcz@lucidpixels.com> wrote:
> On Fri, 4 Dec 2009, Jiri Kosina wrote: > > >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. > > > > Thanks for the response.. Good to know.
I dont buy the 10% without seeing precise measurement results. 1-2% maybe, in some cases.
Ingo
| |