Date: Thu, 9 Apr 2009 11:02:06 +0200 (CEST) From: "Bjoern Koenig" <bkoenig@alpha-tierchen.de> To: pyunyh@gmail.com Cc: stable@freebsd.org Subject: Re: fxp: stalled transfers Message-ID: <c527997835b4ea46c1e492c3a3c9d030.squirrel@webmail.alpha-tierchen.de> In-Reply-To: <20090409072309.GF37714@michelle.cdnetworks.co.kr> 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>
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pyunyh@gmail.com 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. Björn
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