Date: Fri, 10 Apr 2009 09:15:36 +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: <20090410001536.GH37714@michelle.cdnetworks.co.kr> In-Reply-To: <c527997835b4ea46c1e492c3a3c9d030.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>
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On Thu, Apr 09, 2009 at 11:02:06AM +0200, Bjoern Koenig wrote: > 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. > I think you're right. Thanks a lot!
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