hi, I am observing drastic throughput reduction in IPSEC traffic with RT enable and disable. Throughput drops from 576 fps to 69fps. Please note that I am using 8-core system with Linux 3.0.26-rt45 (SMP) running on it. With the help of ftrace (function graph) in case of RT enable, I could see xfrm_policy_get_afinfo() and xfrm_policy_put_afinfo taking time() sometimes taking time arounnd 1.43 msec and 1.351msec respectively. As in my test case, I was writing afinfo_policy before starting the traffic without chainging in between, it was safe to remove read lock and read unlock from xfrm_policy_get_afinfo() and xfrm_policy_put_afinfo() functions. With the read lock/unlock removed, I could see throughput rising from 69fps to 133fps. Now I need your suggestions for the below: 1) Removing the read lock is not a good way as the system might now work properly in the real set-up. But with the change of read-write lock to mutex by PREEMPT_RT patch, I am not able to fully utilize 8-core system leading to drastic reduction in throughput. So what is the suggested way to tackle this situation. 2) Even after removing the read lock, I could see the difference in IPSEC thoughput in RT enable (133fps) and RT disable (576fps). Any suggestion?. Regards Priyanka -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
