Fri, Apr 20, 2007 at 12:24:17PM -0700, Christoph Lameter wrote: >>> False sharing for a per cpu data structure? Are we updating that >>> structure from other processors?
On Fri, 20 Apr 2007, William Lee Irwin III wrote: >> Primarily in the load balancer, but also in wakeups. On Fri, Apr 20, 2007 at 12:33:13PM -0700, Christoph Lameter wrote: > That is fairly rare I think. What other variables that are also writtten > frequently would cause false sharing? I wrote that backward, sorry. Cross-CPU wakeups' frequency depend heavily on the workload. Probably the only other case I can think of is io_schedule() but that's not really significant. I'm not really convinced it's all that worthwhile of an optimization, essentially for the same reasons as you, but presumably there's a benchmark result somewhere that says it matters. I've just not seen it. -- wli - 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/
