Date: Fri, 10 Apr 2009 19:14:45 +0900 From: Pyun YongHyeon <pyunyh@gmail.com> To: Bjoern Koenig <bkoenig@alpha-tierchen.de> Cc: stable@freebsd.org Subject: Re: fxp: stalled transfers Message-ID: <20090410101445.GL37714@michelle.cdnetworks.co.kr> In-Reply-To: <37a8d3252c3d50682f4fb790e30e09f3.squirrel@webmail.alpha-tierchen.de> References: <70ba25e4f1a5e43ab8d99b361235dda2.squirrel@webmail.alpha-tierchen.de> <20090409000427.GD37714@michelle.cdnetworks.co.kr> <2f68678165f20f2e1dae10cb0e63761d.squirrel@webmail.alpha-tierchen.de> <20090409072309.GF37714@michelle.cdnetworks.co.kr> <c527997835b4ea46c1e492c3a3c9d030.squirrel@webmail.alpha-tierchen.de> <37a8d3252c3d50682f4fb790e30e09f3.squirrel@webmail.alpha-tierchen.de>
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On Fri, Apr 10, 2009 at 08:46:08AM +0200, Bjoern Koenig wrote: > I wrote: > > > >> If you can easily reproduce the issue, can you capture stalled TCP > >> session with tcpdump on receiving host?(Make sure to disable Rx > >> checksum offload prior to capturing the session.) > > > > I transferred a 256 kiB file and these are the tcpdumps: > > > > http://www.alpha-tierchen.de/~bkoenig/fxp0-with-tso.txt > > http://www.alpha-tierchen.de/~bkoenig/fxp0-without-tso.txt > > > > Actually the transfer doesn't stall although ftp and scp told me so. It > > becomes incredibly slow. It seems like that the chunks are too large and a > > smaller packet will be resent. I decreased the MTU from 1500 to 1492 and > > it works fine with TSO enabled. > > > > I also captured the traffic on my router: > > > > http://www.alpha-tierchen.de/~bkoenig/fxp0-with-tso-router.txt > > http://www.alpha-tierchen.de/~bkoenig/fxp0-without-tso-router.txt > > > > It reveals a suspect information: "truncated-ip - 8 bytes missing!" > > > > I almost suppose that this is a PPPoE-related configuration issue and the > > fxp driver is not necessarily the problem since decreasing the MTU of the > > LAN host solves it. > > Hello, it's me again. :) > > It's not PPPoE-related. I was able to reproduce the behaviour within a > regular LAN from host to host. I also have another symptom which denies > the PPPoE assumption: > > If I set MTU to value X then it doesn't work with MTU X+N anymore. I'll > get the message "N bytes missing!" in the tcpdump output. For example: > > ifconfig fxp0 mtu 1448 # works > ifconfig fxp0 mtu 1412 # still works > ifconfig fxp0 mtu 1448 # doesn't work (36 bytes missing) > ifconfig fxp0 mtu 1400 # works > ifconfig fxp0 mtu 1412 # doesn't work (12 bytes missing) > Hmm, I can't reproduce this. Can you send me a URL to captured data for broken case?
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