Hi, I've tested the latest upstream kernel and it seems the problem still exists.
[hloeung@darkon tmp]$ uname -a Linux darkon 3.11.10-03111001-generic #201312110635 SMP Wed Dec 11 11:35:43 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux (from http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.11.10.1-saucy/) Without 11n_disable=1: | [hloeung@darkon tmp]$ ping 203.12.160.35 -c 100 | grep -v 'ttl=[[:digit:]]\+[[:space:]]time=[[:digit:]]\{2\}\.' | PING 203.12.160.35 (203.12.160.35) 56(84) bytes of data. | 64 bytes from 203.12.160.35: icmp_seq=13 ttl=227 time=1492 ms | 64 bytes from 203.12.160.35: icmp_seq=14 ttl=227 time=502 ms | 64 bytes from 203.12.160.35: icmp_seq=18 ttl=227 time=1979 ms | 64 bytes from 203.12.160.35: icmp_seq=19 ttl=227 time=1001 ms | 64 bytes from 203.12.160.35: icmp_seq=20 ttl=227 time=1595 ms | 64 bytes from 203.12.160.35: icmp_seq=21 ttl=227 time=636 ms | 64 bytes from 203.12.160.35: icmp_seq=26 ttl=227 time=1661 ms | 64 bytes from 203.12.160.35: icmp_seq=27 ttl=227 time=701 ms | 64 bytes from 203.12.160.35: icmp_seq=31 ttl=227 time=1321 ms | 64 bytes from 203.12.160.35: icmp_seq=33 ttl=227 time=565 ms | 64 bytes from 203.12.160.35: icmp_seq=50 ttl=227 time=719 ms | 64 bytes from 203.12.160.35: icmp_seq=54 ttl=227 time=1503 ms | 64 bytes from 203.12.160.35: icmp_seq=55 ttl=227 time=512 ms | 64 bytes from 203.12.160.35: icmp_seq=56 ttl=227 time=602 ms | 64 bytes from 203.12.160.35: icmp_seq=60 ttl=227 time=1500 ms | 64 bytes from 203.12.160.35: icmp_seq=61 ttl=227 time=517 ms | 64 bytes from 203.12.160.35: icmp_seq=62 ttl=227 time=961 ms | 64 bytes from 203.12.160.35: icmp_seq=76 ttl=227 time=1439 ms | 64 bytes from 203.12.160.35: icmp_seq=77 ttl=227 time=450 ms | 64 bytes from 203.12.160.35: icmp_seq=82 ttl=227 time=1442 ms | 64 bytes from 203.12.160.35: icmp_seq=83 ttl=227 time=454 ms | 64 bytes from 203.12.160.35: icmp_seq=88 ttl=227 time=1214 ms | 64 bytes from 203.12.160.35: icmp_seq=89 ttl=227 time=214 ms | 64 bytes from 203.12.160.35: icmp_seq=93 ttl=227 time=1182 ms | 64 bytes from 203.12.160.35: icmp_seq=94 ttl=227 time=667 ms | 64 bytes from 203.12.160.35: icmp_seq=100 ttl=227 time=1384 ms | | --- 203.12.160.35 ping statistics --- | 100 packets transmitted, 97 received, 3% packet loss, time 99188ms | rtt min/avg/max/mdev = 17.821/287.165/1979.984/501.613 ms, pipe 2 | | [hloeung@darkon tmp]$ iwconfig | lo no wireless extensions. | | wlan0 IEEE 802.11abgn ESSID:"star-local-5GHz" | Mode:Managed Frequency:5.22 GHz Access Point: C0:25:06:A6:31:0E | Bit Rate=240 Mb/s Tx-Power=15 dBm | Retry long limit:7 RTS thr:off Fragment thr:off | Power Management:off | Link Quality=61/70 Signal level=-49 dBm | Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 | Tx excessive retries:18288 Invalid misc:21 Missed beacon:0 Notice the high Tx excessive retries? Now iwlwifi module reloaded with 11n_disable=1: | [hloeung@darkon tmp]$ ping 203.12.160.35 -c 100 | grep -v 'ttl=[[:digit:]]\+[[:space:]]time=[[:digit:]]\{2\}\.' | PING 203.12.160.35 (203.12.160.35) 56(84) bytes of data. | | --- 203.12.160.35 ping statistics --- | 100 packets transmitted, 100 received, 0% packet loss, time 99148ms | rtt min/avg/max/mdev = 14.929/22.947/62.614/11.495 ms | | [hloeung@darkon tmp]$ iwconfig | lo no wireless extensions. | | wlan0 IEEE 802.11abg ESSID:"star-local-5GHz" | Mode:Managed Frequency:5.22 GHz Access Point: C0:25:06:A6:31:0E | Bit Rate=54 Mb/s Tx-Power=15 dBm | Retry long limit:7 RTS thr:off Fragment thr:off | Power Management:on | Link Quality=61/70 Signal level=-49 dBm | Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 | Tx excessive retries:0 Invalid misc:155 Missed beacon:0 Hope this helps. Regards, Haw ** Tags removed: needs-upstream-testing ** Tags added: kernel-bug-exists-upstream kernel-bug-exists-upstream-v3.11.10.1-saucy -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/837076 Title: 8086:422b [Samsung NP900X3A-A01AU] Intel Centrino Ultimate-N 6300 AGN and packet loss using WiFi-N To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/837076/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
