Date: Wed, 04 Sep 2013 12:53:53 +0800 From: Julian Elischer <julian@freebsd.org> To: David Wolfskill <david@catwhisker.org> Cc: FreeBSD Net <net@FreeBSD.org> Subject: Re: TSO and FreeBSD vs Linux Message-ID: <5226BCE1.40107@freebsd.org> In-Reply-To: <20130903224928.GQ1577@albert.catwhisker.org> References: <520A6D07.5080106@freebsd.org> <5214F506.3070706@freebsd.org> <20130903192734.GA19406@albert.catwhisker.org> <20130903224928.GQ1577@albert.catwhisker.org>
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On 9/4/13 6:49 AM, David Wolfskill wrote: > On Tue, Sep 03, 2013 at 12:27:34PM -0700, David Wolfskill wrote: >> ... >> As soon as I issued "sudo net.inet.tcp.tso=0" ... the copy worked without >> a hitch or a whine. And I was able to copy all 117709618 bytes, not just >> 2097152 (2^21). > The above command should (of course) have read > > sudo sysctl net.inet.tcp.tso=0 > > Also: I normally had the em0 NIC on the machine in question connected to > a Netgear GS105 (5-port Gigabit switch). In the process of > trouble-shooting the problem with NFS writes, I bypassed that switch and > connected the em0 NIC directly to the jack in my cube. > > In that configuration, the em0 NIC showed "media: Ethernet 1000baseT > (autoselect)", while connected to the GS105, it showed "media: Ethernet > 100baseTX (autoselect)". > > While the NFS write worked whether or not I had the GS105 in the path, > it seemed ... suboptimal ... to have a NIC capable of 1000baseT > connected to a Gigabit switch, but negotiating at 100baseTX. > > So I tried setting the media via "ifconfig em0 media 1000baseT"; after a > few seconds, it finally woke back up, and now reports "media: Ethernet > 1000baseT (1000baseT <full-duplex>)". > > So it appears that the em(4) driver and Intel 82578DM NIC fail to > negotiate 1000baseT with the Netgear GS105. yeah auto-negotiation seems a bit fragile.. not just for us either.. I often end up hardwiring it in rc.conf. > Peace, > david
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