On Wed, Jul 18, 2018 at 11:01:52AM -0400, Alan Stern wrote: > On Wed, 18 Jul 2018, Johannes Thumshirn wrote: > > > On Wed, Jul 18, 2018 at 10:12:37AM -0400, Alan Stern wrote: > > > As one extra reminder... People who care about extreme performance can > > > perfectly well disable CONFIG_PM in their kernels. That should remove > > > any overhead due to runtime PM. > > > > Yes but how likely is this for people who are running their data > > center with a distribution kernel. > > Strictly speaking, that's a nonsense question. People who run > distribution kernels are 100% unlikely to change the kernel > configuration, by definition. > > That's not the point. If people really care about getting the utmost > performance, to the extent that they resent the minimal overhead > required for runtime PM, then they should not be running distribution > kernels in the first place. Can we agree to disagree here? Some of the people I know in HPC, HFT, etc... run stock SLE/RHEL and they do file bugs for every single 3-5% performance regression. This is not something I made up, this is the kind of things I have to deal with on my day job. So long, Johannes -- Johannes Thumshirn Storage jthumshirn@xxxxxxx +49 911 74053 689 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: Felix Imendörffer, Jane Smithard, Graham Norton HRB 21284 (AG Nürnberg) Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850
