Date: Sat, 18 Sep 2004 00:16:20 +0200 From: Andre Oppermann <andre@freebsd.org> To: "Raphael H. Becker" <rabe@p-i-n.com> Cc: freebsd-current@freebsd.org Subject: Re: Strange things on GBit / 1000->100 / net.inet.tcp.inflight.* Message-ID: <414B6234.8060904@freebsd.org> In-Reply-To: <20040917235056.I55054@p-i-n.com> References: <20040917104356.E55054@p-i-n.com> <414ADD15.FAC42CDB@freebsd.org> <20040917231922.G55054@p-i-n.com> <414B567C.9060904@freebsd.org> <20040917235056.I55054@p-i-n.com>
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Raphael H. Becker wrote: > On Fri, Sep 17, 2004 at 11:26:20PM +0200, Andre Oppermann wrote: > >>Raphael H. Becker wrote: >> >>>># sysctl net.inet.tcp >>>># sysctl net.inet.tcp.hostcache.list >>>># netstat -s -p tcp >>>># netstat -s -p ip >>> >>>http://rhb.uugrn.org/FreeBSD/bugs/5.x/1000-to-100/check_before.txt >>>http://rhb.uugrn.org/FreeBSD/bugs/5.x/1000-to-100/check_after.txt >> >>Could you please provide the same information (except the second sysctl one) >>from the target machine as well. You don't have to show the difference > > http://rhb.uugrn.org/FreeBSD/bugs/5.x/1000-to-100/check_target.txt Ok, this give some very stange information: On the taget machine (4.10) we see a huge amount of OO packets arriving: 92920 out-of-order packets (134546620 bytes) but we don't see nearly that many on retransmits on the source machine (5.3): 281 data packets (405792 bytes) retransmitted However the data set on the target machine seem to be skewed. There is a lot of other TCP traffic on there as well. So this probably doesn't really relate directly to the test you did. >>between before and after but try to make sure that not much other traffic >>was going than the test. > > Just my ssh-Session. But I can't guarantee for each packet passing the > router (= the target-machine). There's no "production"-traffic on that > subnet, just my testboxes. Hmmm... Without getting the TCP statictics back to zero it's hard to correlate any data. Would you mind trying a 5.3 to 5.3 transfer but the target 5.3 box forced to only 100Mbit full-duplex? Same statistics again. -- Andre
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