From: Eric Dumazet <dada1@xxxxxxxxxxxxx> Date: Fri, 05 Dec 2008 17:05:16 +0100 > For NR_CPUS >= 16 values, FBC_BATCH is 2*NR_CPUS > > Considering more and more distros are using high NR_CPUS values, > it makes sense to use a more sensible value for FBC_BATCH. > > A sensible value is 2*num_online_cpus(), with a minimum value of 32 > (This minimum value helps branch prediction in __percpu_counter_add()) > > We already have a hotcpu notifier, so we can adjust FBC_BATCH dynamically. > > Signed-off-by: Eric Dumazet <dada1@xxxxxxxxxxxxx> The downside is now we must load this value in these common routines. But I think the gain outweights the loss so: Acked-by: David S. Miller <davem@xxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
