More on 2.1.28 TCP lockups on Alpha (UDB)

David R. McGown (dmcgown@access.digex.net)
Fri, 07 Mar 1997 06:02:45 -0500 (EST)

qIncoming TCP seems to be broken with kernel 2.1.28 on Alpha on the Multia
(UDB). This is with Ted's tty patch installed. What I am seeing are long
delays for incoming TCP sessions (40 seconds to a minute) before a prompt
occurs. This is happening with telnet, rlogin, ftp. UCP services seem to be
unaffected, NFS is working. I did a tcpdump during during an incoming
connection sequence, and this is what I am seeing. Sorry for the length:

05:47:58.863282 bax.davmar.org.1034 > josquin.davmar.org.telnet: P
3150844030:3150844032(2) ack 1724695030 win 4380
05:47:58.865235 josquin.davmar.org.telnet > bax.davmar.org.1034: P 1:30(29)
ack 2 win 31744 (DF)
05:47:58.875000 bax.davmar.org.1034 > josquin.davmar.org.telnet: . ack 30
win 4380
05:48:02.563477 bax.davmar.org.1034 > josquin.davmar.org.telnet: P 2:3(1)
ack 30
win 4380
05:48:02.565430 josquin.davmar.org.telnet > bax.davmar.org.1034: P 30:31(1)
ack 3 win 31744 (DF)
05:48:02.567383 bax.davmar.org.1034 > josquin.davmar.org.telnet: . ack 31
win 4380
05:48:02.733399 bax.davmar.org.1034 > josquin.davmar.org.telnet: P 3:4(1)
ack 31
win 4380
05:48:02.734375 josquin.davmar.org.telnet > bax.davmar.org.1034: P 31:32(1)
ack 4 win 31744 (DF)
05:48:02.736328 bax.davmar.org.1034 > josquin.davmar.org.telnet: . ack 32
win 4380
05:48:02.870118 bax.davmar.org.1034 > josquin.davmar.org.telnet: P 4:5(1)
ack 32
win 4380
05:48:02.871094 josquin.davmar.org.telnet > bax.davmar.org.1034: P 32:33(1)
ack 5 win 31744 (DF)
05:48:02.872071 bax.davmar.org.1034 > josquin.davmar.org.telnet: . ack 33
win 4380
05:48:03.040039 bax.davmar.org.1034 > josquin.davmar.org.telnet: P 5:6(1)
ack 33
win 4380
05:48:03.041016 josquin.davmar.org.telnet > bax.davmar.org.1034: P 33:34(1)
ack 6 win 31744 (DF)
05:48:03.041993 bax.davmar.org.1034 > josquin.davmar.org.telnet: . ack 34
win 4380
05:48:03.199219 bax.davmar.org.1034 > josquin.davmar.org.telnet: P 6:7(1)
ack 34
win 4380
05:48:03.200196 josquin.davmar.org.telnet > bax.davmar.org.1034: P 34:35(1)
ack 7 win 31744 (DF)
05:48:03.201172 bax.davmar.org.1034 > josquin.davmar.org.telnet: . ack 35
win 4380
05:48:03.335938 bax.davmar.org.1034 > josquin.davmar.org.telnet: P 7:8(1)
ack 35
win 4380
05:48:03.336914 josquin.davmar.org.telnet > bax.davmar.org.1034: P 35:36(1)
ack 8 win 31744 (DF)
05:48:03.337891 bax.davmar.org.1034 > josquin.davmar.org.telnet: . ack 36
win 4380
05:48:03.765625 bax.davmar.org.1034 > josquin.davmar.org.telnet: P 8:9(1)
ack 36
win 4380
05:48:03.766602 josquin.davmar.org.telnet > bax.davmar.org.1034: P 36:37(1)
ack 9 win 31744 (DF)
05:48:03.768555 bax.davmar.org.1034 > josquin.davmar.org.telnet: . ack 37
win 4380
05:48:07.301758 bax.davmar.org.1034 > josquin.davmar.org.telnet: P 9:10(1)
ack 37 win 4380
05:48:07.303711 josquin.davmar.org.telnet > bax.davmar.org.1034: P 37:38(1)
ack 10 win 31744 (DF)
05:48:07.304688 bax.davmar.org.1034 > josquin.davmar.org.telnet: . ack 38
win 4380
05:48:07.471680 bax.davmar.org.1034 > josquin.davmar.org.telnet: P 10:11(1)
ack 38 win 4380
05:48:07.472657 josquin.davmar.org.telnet > bax.davmar.org.1034: P 38:39(1)
ack 11 win 31744 (DF)
05:48:07.473633 bax.davmar.org.1034 > josquin.davmar.org.telnet: . ack 39
win 4380
05:48:07.965821 bax.davmar.org.1034 > josquin.davmar.org.telnet: P 11:12(1)
ack 39 win 4380
05:48:07.966797 josquin.davmar.org.telnet > bax.davmar.org.1034: P 39:40(1)
ack 12 win 31744 (DF)
05:48:07.968750 bax.davmar.org.1034 > josquin.davmar.org.telnet: . ack 40
win 4380
05:48:08.167969 bax.davmar.org.1034 > josquin.davmar.org.telnet: P 12:14(2)
ack 40 win 4380
05:48:08.174805 josquin.davmar.org.telnet > bax.davmar.org.1034: P 40:42(2)
ack 14 win 31744 (DF)
05:48:08.175782 bax.davmar.org.1034 > josquin.davmar.org.telnet: . ack 42
win 4380
05:48:08.290039 josquin.davmar.org.1023 > bax.davmar.org.login: S
3335226693:3335226693(0) win 512 <mss 1460>
05:48:08.290039 bax.davmar.org.login > josquin.davmar.org.1023: S
3679507064:3679507064(0) ack 3335226694 win 8192 <mss 1460>
05:48:08.291016 josquin.davmar.org.1023 > bax.davmar.org.login: . ack 1 win
31744
05:48:08.291016 josquin.davmar.org.1023 > bax.davmar.org.login: P 1:2(1) ack
1 win 31744 (DF)
05:48:08.296875 bax.davmar.org.login > josquin.davmar.org.1023: . ack 2 win
8192
05:48:08.296875 josquin.davmar.org.1023 > bax.davmar.org.login: P 2:29(27)
ack 1
win 31744 (DF)
05:48:08.359375 bax.davmar.org.login > josquin.davmar.org.1023: . ack 29 win
8192
05:48:08.371094 bax.davmar.org.1062 > josquin.davmar.org.domain: 30550+ (36)
05:48:08.383789 josquin.davmar.org > bax.davmar.org: icmp:
josquin.davmar.org udp port domain unreachable [tos 0xc0]
05:48:13.384766 bax.davmar.org.1063 > josquin.davmar.org.domain: 30550+ (36)
05:48:13.385743 josquin.davmar.org > bax.davmar.org: icmp:
josquin.davmar.org udp port domain unreachable [tos 0xc0]
05:48:23.386719 bax.davmar.org.1064 > josquin.davmar.org.domain: 30550+ (36)
05:48:23.387696 josquin.davmar.org > bax.davmar.org: icmp:
josquin.davmar.org udp port domain unreachable [tos 0xc0]
05:48:43.387696 bax.davmar.org.1065 > josquin.davmar.org.domain: 30550+ (36)
05:48:43.387696 josquin.davmar.org > bax.davmar.org: icmp:
josquin.davmar.org udp port domain unreachable [tos 0xc0]
05:48:59.721680 arp who-has josquin.davmar.org tell maxwell.davmar.org
05:48:59.721680 arp reply josquin.davmar.org is-at 0:40:5:13:96:31
05:49:21.744141 bax.davmar.org.netbios-dgm > 192.168.128.255.netbios-dgm:
udp 215
05:49:21.744141 bax.davmar.org.netbios-ns > 192.168.128.255.netbios-ns: udp
50
05:49:21.744141 bax.davmar.org.netbios-dgm > 192.168.128.255.netbios-dgm:
udp 215
05:49:21.744141 bax.davmar.org.netbios-ns > 192.168.128.255.netbios-ns: udp
50
05:49:21.750977 josquin.davmar.org.netbios-ns > bax.davmar.org.netbios-ns:
udp 62
05:49:23.427735 bax.davmar.org.login > josquin.davmar.org.1023: P 1:2(1) ack
29 win 8192 [tos 0x10]
05:49:23.427735 josquin.davmar.org.1023 > bax.davmar.org.login: . ack 2 win
31744 [tos 0x10]
05:49:23.582032 bax.davmar.org.login > josquin.davmar.org.1023: P 2:3(1) ack
29 win 8192 urg 1 [tos 0x10]
05:49:23.587891 josquin.davmar.org.1023 > bax.davmar.org.login: P 29:41(12)
ack 3 win 31744 (DF) [tos 0x10]
05:49:23.588868 bax.davmar.org.login > josquin.davmar.org.1023: . ack 41 win
8192 [tos 0x10]
05:49:23.736328 bax.davmar.org.login > josquin.davmar.org.1023: P 3:60(57)
ack 41 win 8192 [tos 0x10]
05:49:23.738282 josquin.davmar.org.telnet > bax.davmar.org.1034: P 42:99(57)
ack
14 win 31744 (DF)
05:49:23.744141 bax.davmar.org.1034 > josquin.davmar.org.telnet: . ack 99
win 4380
05:49:23.745118 josquin.davmar.org.1023 > bax.davmar.org.login: . ack 60 win
31744 [tos 0x10]
05:49:23.757813 bax.davmar.org.login > josquin.davmar.org.1023: P
60:622(562) ack 41 win 8192 [tos 0x10]
05:49:23.758789 josquin.davmar.org.telnet > bax.davmar.org.1034: P
99:661(562) ack 14 win 31744 (DF)
05:49:23.774414 bax.davmar.org.1034 > josquin.davmar.org.telnet: . ack 661
win 4380
05:49:23.767578 josquin.davmar.org.1023 > bax.davmar.org.login: . ack 622
win 31744 [tos 0x10]
05:49:24.360352 bax.davmar.org.login > josquin.davmar.org.1023: P
622:645(23) ack 41 win 8192 [tos 0x10]
05:49:24.362305 josquin.davmar.org.telnet > bax.davmar.org.1034: P
661:684(23) ack 14 win 31744 (DF)
05:49:24.365235 bax.davmar.org.1034 > josquin.davmar.org.telnet: . ack 684
win 4380
05:49:24.380860 josquin.davmar.org.1023 > bax.davmar.org.login: . ack 645
win 31744 [tos 0x10]

David
======================================================================
David R. McGown
dmcgown@access.digex.net -o-O-o- LINUX INSIDE!
Home: (703)683-1599 206 Adams Ave ALPHA GENERATION!
Work: (703)416-1240 Alexandria, VA 22301