Re: [PATCH] 2.4.1-ac UP-APIC updates

2001-02-20 Thread Mikael Pettersson
On Tue, 20 Feb 2001 16:00:53 -0500 (EST), Ingo Molnar wrote: >my major gripe right now is that we still have bug reports that say that >systems hang when using nmi_watchdog=1 and work if nmi_watchdog=0. >Changing the NMI watchdog to be 1 Hz will make these bugreports "Linux >hangs once a week"

Re: [PATCH] 2.4.1-ac UP-APIC updates

2001-02-20 Thread Ingo Molnar
On Tue, 20 Feb 2001, Alan Cox wrote: > > i dont like this one. 100 times a second makes absolutely no performance > > difference whatsoever - but eg. i'm driving kernel profiling from the NMI > > handler to get profiles of eg. IRQ handlers and other cli()-ed code areas. > > So set it to 100Hz

Re: [PATCH] 2.4.1-ac UP-APIC updates

2001-02-20 Thread Alan Cox
> i dont like this one. 100 times a second makes absolutely no performance > difference whatsoever - but eg. i'm driving kernel profiling from the NMI > handler to get profiles of eg. IRQ handlers and other cli()-ed code areas. So set it to 100Hz as a debugging option like slab debugging - To

Re: [PATCH] 2.4.1-ac UP-APIC updates

2001-02-20 Thread Ingo Molnar
On Tue, 20 Feb 2001, Mikael Pettersson wrote: > * NMI rate reduction for UP-APIC: the 100Hz default rate is excessive for > normal systems, 1Hz suffices. It turns out we cannot start at 1Hz due to > this interacting badly with check_nmi_watchdog() and the watchdog itself, > so the rate is

Re: [PATCH] 2.4.1-ac UP-APIC updates

2001-02-20 Thread Ingo Molnar
On Tue, 20 Feb 2001, Mikael Pettersson wrote: * NMI rate reduction for UP-APIC: the 100Hz default rate is excessive for normal systems, 1Hz suffices. It turns out we cannot start at 1Hz due to this interacting badly with check_nmi_watchdog() and the watchdog itself, so the rate is

Re: [PATCH] 2.4.1-ac UP-APIC updates

2001-02-20 Thread Alan Cox
i dont like this one. 100 times a second makes absolutely no performance difference whatsoever - but eg. i'm driving kernel profiling from the NMI handler to get profiles of eg. IRQ handlers and other cli()-ed code areas. So set it to 100Hz as a debugging option like slab debugging - To

Re: [PATCH] 2.4.1-ac UP-APIC updates

2001-02-20 Thread Ingo Molnar
On Tue, 20 Feb 2001, Alan Cox wrote: i dont like this one. 100 times a second makes absolutely no performance difference whatsoever - but eg. i'm driving kernel profiling from the NMI handler to get profiles of eg. IRQ handlers and other cli()-ed code areas. So set it to 100Hz as a

Re: [PATCH] 2.4.1-ac UP-APIC updates

2001-02-20 Thread Mikael Pettersson
On Tue, 20 Feb 2001 16:00:53 -0500 (EST), Ingo Molnar wrote: my major gripe right now is that we still have bug reports that say that systems hang when using nmi_watchdog=1 and work if nmi_watchdog=0. Changing the NMI watchdog to be 1 Hz will make these bugreports "Linux hangs once a week"