Messages in this thread | | | From | Rusty Russell <> | Subject | Re: [benchmark] 1% performance overhead of paravirt_ops on native kernels | Date | Sat, 6 Jun 2009 00:01:36 +0930 |
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On Fri, 5 Jun 2009 05:01:25 pm Gerd Hoffmann wrote: > Hi, > > > I think you're missing the point of Rusty's benchmark. I see his > > exercise as "compare a kernel configured as a distro would vs a > > custom-built kernel configured for the exact target environment". In > > that light, questions about the CONFIG options Rusty used should be based > > on whether most distros would use them in their stock kernels as opposed > > to how necessary they are. > > Well. The test ran on a machine with so much memory that you need > HIGHMEM to use it all. I think it also was SMP. So a custom kernel for > *that* machine would certainly include SMP and HIGHMEM ...
I have a UP machine with 512M of RAM, but I wasn't going to take it out just to prove the point. Hence I used my test machine with mem=880 maxcpus=1 to simulate it, but that's a distraction here.
> While it might be > interesting by itself to see what the overhead of these config options > is, it is IMHO quite pointless *in the context of this discussion*.
No, you completely missed the point. Rusty.
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