The tcp_stream loop back performance has about 10% drop on the commitment on our core2 2 sockets server. This commit has 2 parents(7505afe28, 5983fe), but both of them have no regression. So guess the impact just happened when this 2 parents joint. That beyond our capability to dig it more. Any ideas? Regards! Alex -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/