Messages in this thread | | | Date | Fri, 6 Jan 2006 10:19:26 -0800 (PST) | From | "Randy.Dunlap" <> | Subject | Re: [PATCH] ia64: change defconfig to NR_CPUS==1024 |
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On Fri, 6 Jan 2006, Christoph Lameter wrote:
> On Fri, 6 Jan 2006, Matthew Wilcox wrote: > > > On Fri, Jan 06, 2006 at 09:45:20AM -0800, Luck, Tony wrote: > > > I suppose that depends on your expectations from defconfig. In my > > > mind its the one that builds into a kernel that will boot and run > > > on just about any box. People who want to get a bit of extra performance > > > will do the re-compilation to strip out the bits that they don't want > > > and tune down limits that are set higher than they need. I only > > > > You can use that argument to set the CPU limit low too -- since a kernel > > with a CPU limit lower than the number of CPUs in the box will just ignore > > the additional ones, people who want to get the additional performance > > will tune limits that are set lower than they need ;-) > > The dicey thing in all of this is that the generic kernels will be used > for the certification of applications. If the cpu limit is too low then > applications will simply not be certified for these high processor counts. > One may encounter problems if the app is then run with a higher processor > count.
Do you equate a 'defconfig' kernel with a generic kernel?
I would expect certs to be done on vendor kernels, and as Arjan has suggested, they will have their own configs, not defconfig.
> > > There are quite a few >16 socket boxes out there, which will give > > > you >64 cpus with Montecito ... so I don't think that the >64 cpu > > > system is going to remain in the noise for long. > > > > I bet the number of 32-way+ boxes is lost in the noise compared to the > > number of 1-, 2- and 4-way boxes sold. Not that HP trust me with that > > kind of sales data ;-) > > I think it is wrong to count the number of boxes. It is the number of > users that is of major interest. These small boxes typically have one > user. The larger boxes have whole communities working with them. The > number of users of very large systems can potentially go into the 10 > thousands of users per installation. > > Moreover these larger boxes significantly impact the technological > progress of humanity on the planet. These large boxes run hurricane > simulations, do complex visualization necessary for bio technological > advances, cosmological simulations, other physic stuff etc etc.
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