Am 20.09.2013 um 02:37 schrieb Guillaume Gardet <[email protected]>:
> > Le 20/09/2013 05:34, Alexander Graf a écrit : >> On 18.09.2013, at 02:33, Guillaume Gardet wrote: >> >>> Le 16/09/2013 16:17, Alexander Graf a écrit : >>>> Hey, >>>> >>>> Am 16.09.2013 um 07:12 schrieb Guillaume Gardet <[email protected]>: >>>> >>>>> Hi, >>>>> >>>>> I would like to enable a kernel-desktop for ARM, especially for GFX >>>>> images. >>>>> >>>>> I modified kernel-default by using CONFIG_PREEMPT instead of >>>>> CONFIG_PREEMPT_NONE. >>>> Couldn't we just make preempt_desktop the default for armv7? >>> It could save us a kernel flavour build but CONFIG_PREEMPT_NONE would be >>> better for servers (better dry performances) and CONFIG_PREEMPT would be >>> better for desktop interfaces (less latency). >> Well, is the difference significant? If the loss in performance for server >> style workloads is negligible, why not always enable preemption? > > I did not benchmark it, but I guess there is a significant difference, > otherwise, openSUSE x86 kernels would not have 2 flavours. Maybe, we should > ask on -kernel ML? > > Is there anyone having opinion/benchmark about that? > > One thing is sure, preempt gives a better desktop user experience. IIRC the main driver behind preempt_none is SLES where 1% performance counts a lot. For us it shouldn't really matter too much and I'd prefer to keep things simple for everyone rather than optimized. Alex > > > Guillaume > > > -- To unsubscribe, e-mail: [email protected] To contact the owner, e-mail: [email protected]
