Date: Mon, 17 Mar 2008 10:57:26 +0000 From: "Bruce M. Simpson" <bms@FreeBSD.org> To: "Sean C. Farley" <scf@FreeBSD.org> Cc: freebsd-net@FreeBSD.org Subject: Re: Frequent pauses with Linux-based router Message-ID: <47DE4E96.8080507@FreeBSD.org> In-Reply-To: <alpine.BSF.1.00.0803161517370.56728@thor.farley.org> References: <alpine.BSF.1.00.0803161517370.56728@thor.farley.org>
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Sean C. Farley wrote: > I have noticed that with a Linux-based Netgear DG834G (DSL modem) > frequent pauses (example[1]) between external systems and 7-STABLE > (March 14th). At first, I thought it was ipfilter or ipnat, but I took > those out of the picture by activating telnet on the router and > connecting directly to it. Even running "ls /usr/sbin" on the router > would pause occasionally. I did not (or did not recall) have these > problems with 6-STABLE (post 6.2). I switched out the NIC (FA-311 (sis) > to a FA-310 (dc)), cable and tried different ports on the modem by which > to connect. I also tried disabling all RFC sysctl's and SACK. Nothing > helped. > > Finally, I brought out an old DSL modem (SpeedStream 5660). This fixed > the issue. I think this maybe a specific issue between Linux > (2.4.17_mvl21-malta-mips_fp_le) and FreeBSD 7. Is there anything else I > may test to see what is happening? OT: Hang on, are you saying you're running a MIPS MALTA targeted Linux kernel on a Netgear DG834G? That would be interesting as a test platform for FreeBSD/mips, considering the platform support for Malta is already there. I had a go at doing the Broadcom Sentry5 SoC last year but hadn't finished anything. Long shot, but are 802.3 pause frames appearing anywhere, ie can you test with a crossover cable? Have you done a BER test with UDP or something like that to try to rule out non-TCP protocols? cheers BMS
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