Messages in this thread | | | Date | Fri, 12 Feb 1999 21:16:08 +0100 (CET) | From | Andrea Arcangeli <> | Subject | Re: Weird tcp performance differences with 2.0 and 2.2 kernels |
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On Fri, 12 Feb 1999, Mike Galbraith wrote:
>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?
Looking at your trace I noticed that ftp.porcupine.org echo the tsval of the syn in the syn-ack, while linux doesn't. But the timestamp in the syn and synack should be needed only to initialize paws to avoid wrapped sequence number, so I think linux is doing a more efficient choice without echoing the tp->tsrecent in the synack packet. I am not 100% sure though because I never seen rfc1323.txt before today (and I am not uptodate with latest tcp-impl-drafts).
Andrea Arcangeli
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