On 8 October 2012 18:10, Theodore Ts'o <tytso@xxxxxxx> wrote: > How expensive are memory barriers on ARM, anyway? The performance monitors seem to be telling me that a DMB just after a store which misses in the L1 & L2, (causing an eviction of a clean line and a line-fill, I assume) takes over 100 cycles. I'm seeing a 20% slow down in ext4 performance when enabling SMP on my device. I'm starting to think there might be issues with the memory system. -Pete -- 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
