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Message-ID: <491A8281.6040804@route66.ro> Date: Wed, 12 Nov 2008 09:15:13 +0200 From: ROUTE 66 - Catalin BOIE <cboie@...te66.ro> To: � <ilpo.jarvinen@...sinki.fi> CC: Netdev <netdev@...r.kernel.org> Subject: Re: Strange TCP dump between a Linux and a Samsung phone � wrote: > On Tue, 11 Nov 2008, ROUTE 66 - Catalin BOIE wrote: Hello! After upgrading to 2.6.26.?, the problem was fixed! Thank you very much for your super quick answer! >> I have captured a strange dump between a Linux kernel >> 2.6.25.6-55.fc9.x86_64 and a Samsung device. > > Please upgrade or prove that the tcp fixes that were in the later kernel > (.7 iirc or 2.6.26) got applied into that -55 part. >> I looked at it and it seems that the Linux stack does not send any >> retransmissions to Samsung device. >> But, I want a competent look from you. >> >> The connection is done over a 3G connection. >> The capture was done on a router between the two endpoints. >> c.66.com is the Linux machine, the other IP is the Samsung device. > > ...snip... > >> As you may see, the Samsung device keeps sending an ACK for 1261841 and >> after some time closes the connection. >> Why the Linux stack does no retransmissions? > > Looks like a know bug in frto which got fixed. > > If upgrade is not an option, you can experiment by playing with tcp_frto > sysctl (with 0 you should not encounter that bug). Thanks! -- Catalin BOIE ROUTE 66 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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