On Tue, 17 Apr 2007, William Lee Irwin III wrote: > On Tue, Apr 17, 2007 at 09:01:55AM +0200, Nick Piggin wrote: > > Latency. Given N tasks in the system, an arbitrary task should get > > onto the CPU in a bounded amount of time (excluding events like freak > > IRQ holdoffs and such, obviously -- ie. just considering the context > > of the scheduler's state machine). > > ISTR Davide Libenzi having a scheduling latency test a number of years > ago. Resurrecting that and tuning it to the needs of this kind of > testing sounds relevant here. The test suite Peter Willliams mentioned > would also help. That helped me a lot at that time. At every context switch was sampling critical scheduler parameters for both entering and exiting task (and associated timestamps). Then the data was collected through a /dev/idontremember from userspace for analysis. It'd very useful to have it those days, to study what really happens under the hook (scheduler internal parameters variations and such) when those wierd loads make the scheduler unstable. - Davide - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
- References:
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Mike Galbraith <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Peter Williams <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Mike Galbraith <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Nick Piggin <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Peter Williams <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Nick Piggin <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: William Lee Irwin III <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Nick Piggin <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: William Lee Irwin III <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Nick Piggin <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: William Lee Irwin III <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- Prev by Date: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- Next by Date: Re: [linux-pm] [PATCH][RFC] Kill off legacy power management stuff.
- Previous by thread: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- Next by thread: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- Index(es):
 |