Re: Weird tcp performance differences with 2.0 and 2.2 kernels

Mike Galbraith (mikeg@weiden.de)
Fri, 12 Feb 1999 08:09:43 +0100 (CET)


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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.

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