Date: Tue, 3 Sep 2013 15:49:28 -0700 From: David Wolfskill <david@catwhisker.org> To: FreeBSD Net <net@FreeBSD.org> Subject: Re: TSO and FreeBSD vs Linux Message-ID: <20130903224928.GQ1577@albert.catwhisker.org> In-Reply-To: <20130903192734.GA19406@albert.catwhisker.org> References: <520A6D07.5080106@freebsd.org> <5214F506.3070706@freebsd.org> <20130903192734.GA19406@albert.catwhisker.org>
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--TSQPSNmi3T91JED+ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Sep 03, 2013 at 12:27:34PM -0700, David Wolfskill wrote: > ... > As soon as I issued "sudo net.inet.tcp.tso=3D0" ... the copy worked witho= ut > 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=3D0 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. Peace, david --=20 David H. Wolfskill david@catwhisker.org Taliban: Evil cowards with guns afraid of truth from a 14-year old girl. See http://www.catwhisker.org/~david/publickey.gpg for my public key. --TSQPSNmi3T91JED+ Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.21 (FreeBSD) iEYEARECAAYFAlImZ3gACgkQmprOCmdXAD1VggCfQSAR6YpT4aJmNih4+Y3IW21G xZoAn0oA8FpQm0iGPgrwHpxinj6xIIcX =DUco -----END PGP SIGNATURE----- --TSQPSNmi3T91JED+--
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