Re: [Patch] sched: new sched domain for representing multi-core

[Pavel Machek <pavel@suse.cz>]

On Čt 26-01-06 01:51:33, Siddha, Suresh B wrote:
> Appended patch adds a new sched domain for representing multi-core with
> shared caches between cores. Consider a dual package system, each package
> containing two cores and with last level cache shared between cores with in a
> package. If there are two runnable processes, with this appended patch
> those two processes will be scheduled on different packages.
> 
> On such system, with this patch we have observed 8% perf improvement with 
> specJBB(2 warehouse) benchmark and 35% improvement with CFP2000 rate(with
> 2 users).
> 
> This new domain will come into play only on multi-core systems with shared
> caches. On other systems, this sched domain will be removed by
> domain degeneration code. This new domain can be also used for implementing
> power savings policy (see OLS 2005 CMP kernel scheduler paper for more
> details.. I will post another patch for power savings policy soon)

Could we all do it with single CONFIG_SCHED_SMT or CONFIG_NUMA or
something like that? No need for zillion options...
								Pavel

-- 
Thanks, Sharp!
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