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SubjectMore on 2.1.28 TCP lockups on Alpha (UDB)
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


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