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SubjectRe: Weird tcp performance differences with 2.0 and 2.2 kernels
On Fri, 12 Feb 1999, David C Niemi wrote:

>
> Users are reporting odd and unpleasant FTP hangs on ftp.tux.org as well,
> which is now running 2.2.1 with the latest fixed wu-ftpd. These problems
> did not occur with the 2.0.36 kernel but did with 2.2pre6; I'm not quite
> sure whether they occured in the 2.1.126-8 era because the UP flu made
> things unusable back then.
>
> The hangs do not ALWAYS happen, they are more likely on more remote
> connections and on connections via firewalls (in the latter case the
> connections work fine for a similar FTP server running 2.0.36 and used to
> work fine for ftp.tux.org prior to 2.2.x.

ftp.porcupine.org is one of these for me.. _always_ times out when I
do 'dir' in the /pub/security directory. (tcpdump attached). If I..
echo 0 > /proc/sys/net/ipv4/tcp_timestamps
..it works fine. Anyone know why?
Kernel is 2.2pre2+kernel-ss990203-2.2.1.dif+cvs_i4l

-Mike

P.S.
Anyone know of a tcpdump which can really deal with isdn rawip?
P.P.S
if tcpdump -lnti ippp0 -s 128 is not right, holler and I'll redo.
tcpdump.isdn: listening on ippp0
193.203.186.200.1130 > 168.100.187.42.21: S 3614791303:3614791303(0) win 32120 <mss 1460,sackOK,timestamp 1681590 0,nop,wscale 0> (DF)
168.100.187.42.21 > 193.203.186.200.1130: S 2550133094:2550133094(0) ack 3614791304 win 17376 <mss 1460,nop,wscale 0,nop,nop,timestamp 3021695 1681590> (DF)
193.203.186.200.1130 > 168.100.187.42.21: . ack 1 win 32120 <nop,nop,timestamp 1681607 3021695> (DF)
168.100.187.42.21 > 193.203.186.200.1130: P 1:90(89) ack 1 win 17376 <nop,nop,timestamp 3021696 1681607> (DF)
193.203.186.200.1130 > 168.100.187.42.21: P 1:17(16) ack 90 win 32120 <nop,nop,timestamp 1681643 3021696> (DF)
168.100.187.42.21 > 193.203.186.200.1130: P 90:148(58) ack 17 win 17376 <nop,nop,timestamp 3021696 1681643> (DF)
193.203.186.200.1130 > 168.100.187.42.21: P 17:44(27) ack 148 win 32120 <nop,nop,timestamp 1681662 3021696> (DF)
168.100.187.42.21 > 193.203.186.200.1130: P 148:197(49) ack 44 win 17376 <nop,nop,timestamp 3021697 1681662> (DF)
193.203.186.200.1130 > 168.100.187.42.21: . ack 197 win 32120 <nop,nop,timestamp 1681704 3021697> (DF)
168.100.187.42.21 > 193.203.186.200.1130: P 197:610(413) ack 44 win 17376 <nop,nop,timestamp 3021698 1681704> (DF)
193.203.186.200.1130 > 168.100.187.42.21: P 44:63(19) ack 610 win 32120 <nop,nop,timestamp 1681732 3021698> (DF)
168.100.187.42.21 > 193.203.186.200.1130: P 610:639(29) ack 63 win 17376 <nop,nop,timestamp 3021698 1681732> (DF)
193.203.186.200.1130 > 168.100.187.42.21: P 63:68(5) ack 639 win 32120 <nop,nop,timestamp 1681757 3021698> (DF)
168.100.187.42.21 > 193.203.186.200.1130: P 639:682(43) ack 68 win 17376 <nop,nop,timestamp 3021699 1681757> (DF)
193.203.186.200.1130 > 168.100.187.42.21: . ack 682 win 32120 <nop,nop,timestamp 1681778 3021699> (DF)
193.203.186.200.1130 > 168.100.187.42.21: P 68:96(28) ack 682 win 32120 <nop,nop,timestamp 1682201 3021699> (DF)
168.100.187.42.21 > 193.203.186.200.1130: P 682:712(30) ack 96 win 17376 <nop,nop,timestamp 3021708 1682201> (DF)
193.203.186.200.1130 > 168.100.187.42.21: P 96:102(6) ack 712 win 32120 <nop,nop,timestamp 1682224 3021708> (DF)
168.100.187.42.20 > 193.203.186.200.1131: S 2551540352:2551540352(0) win 16384 <mss 1460,nop,wscale 0,nop,nop,timestamp 3021708 0,nop,nop,ccnew 43542> (DF)
193.203.186.200.1131 > 168.100.187.42.20: S 3618244766:3618244766(0) ack 2551540353 win 32120 <mss 1460,nop,nop,timestamp 1682242 0,nop,wscale 0> (DF)
168.100.187.42.21 > 193.203.186.200.1130: . ack 102 win 17376 <nop,nop,timestamp 3021708 1682224> (DF)
168.100.187.42.20 > 193.203.186.200.1131: . ack 1 win 17376 <nop,nop,timestamp 3021708 1682242> (DF)
truncated-ip - 7 bytes missing!168.100.187.42.21 > 193.203.186.200.1130: P 712:765(53) ack 102 win 17376 <nop,nop,timestamp 3021708 1682224> (DF)
truncated-ip - 7 bytes missing!168.100.187.42.20 > 193.203.186.200.1131: . 1:1449(1448) ack 1 win 17376 <nop,nop,timestamp 3021708 1682242> (DF)
168.100.187.42.21 > 193.203.186.200.1130: P 712:789(77) ack 102 win 17376 <nop,nop,timestamp 3021710 1682224> (DF)
193.203.186.200.1130 > 168.100.187.42.21: . ack 789 win 32120 <nop,nop,timestamp 1682369 3021710> (DF)
168.100.187.42.20 > 193.203.186.200.1129: . 2541497618:2541499066(1448) ack 3569211494 win 17376 <nop,nop,timestamp 3021735 1680272> (DF)
193.203.186.200.1129 > 168.100.187.42.20: R 3569211494:3569211494(0) win 0
193.203.186.200.1131 > 168.100.187.42.20: F 1:1(0) ack 1 win 32120 <nop,nop,timestamp 1685367 3021708> (DF)
168.100.187.42.20 > 193.203.186.200.1131: . ack 2 win 17376 <nop,nop,timestamp 3021771 1685367> (DF)
193.203.186.200.1130 > 168.100.187.42.21: P 102:105(3) ack 789 win 32120 <nop,nop,timestamp 1685390 3021710> (DF)
193.203.186.200.1130 > 168.100.187.42.21: P 105:106(1) ack 789 win 32120 urg 1 <nop,nop,timestamp 1685390 3021710> (DF)
168.100.187.42.21 > 193.203.186.200.1130: . ack 105 win 17376 <nop,nop,timestamp 3021771 1685390> (DF)
193.203.186.200.1130 > 168.100.187.42.21: P 105:106(1) ack 789 win 32120 urg 1 <nop,nop,timestamp 1685458 3021771> (DF)
168.100.187.42.21 > 193.203.186.200.1130: . ack 106 win 17376 <nop,nop,timestamp 3021773 1685458> (DF)
193.203.186.200.1130 > 168.100.187.42.21: P 106:112(6) ack 789 win 32120 <nop,nop,timestamp 1685474 3021773> (DF)
168.100.187.42.21 > 193.203.186.200.1130: P 789:819(30) ack 112 win 17376 <nop,nop,timestamp 3021773 1685474> (DF)
193.203.186.200.1130 > 168.100.187.42.21: . ack 819 win 32120 <nop,nop,timestamp 1685496 3021773> (DF)
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