Date: Mon, 31 Jan 2005 15:03:28 -0800 From: Brooks Davis <brooks@one-eyed-alien.net> To: Robert Watson <rwatson@FreeBSD.org> Cc: John Baldwin <jhb@FreeBSD.org> Subject: Re: cvs commit: src/sys/dev/fxp if_fxp.c Message-ID: <20050131230328.GA12221@odin.ac.hmc.edu> In-Reply-To: <Pine.NEB.3.96L.1050131223832.35704P-100000@fledge.watson.org> References: <200501311442.23648.jhb@FreeBSD.org> <Pine.NEB.3.96L.1050131223832.35704P-100000@fledge.watson.org>
next in thread | previous in thread | raw e-mail | index | archive | help
--FL5UXtIhxfXey3p5 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Jan 31, 2005 at 10:38:49PM +0000, Robert Watson wrote: >=20 > On Mon, 31 Jan 2005, John Baldwin wrote: >=20 > > On Saturday 29 January 2005 06:13 pm, Robert Watson wrote: > > > rwatson 2005-01-29 23:13:20 UTC > > > > > > FreeBSD src repository > > > > > > Modified files: > > > sys/dev/fxp if_fxp.c > > > Log: > > > Disable ethernet flow control in if_fxp by default, in order to pre= vent > > > unexpected surprises when a system panics or is left in the debugge= r. > >=20 > > Is this the bit that would cause the interface to start spewing pause > > packets onto the network after a panic resulting in the whole network > > being useless until the box is powered off?=20 >=20 > Yup, that's the one. It's a feature :-). It's worth noting that flowcontrol is of severely limited use in many cases. First, it doesn't differentiate between packets you want and packets you don't. Second, current switches don't generate it so if several hosts are beating up on one (as happens if you have a clusters file system), the switch won't tell them to back off and you start losing packets in the switch. TCP seriously sucks when you lose packets in the LAN. :) -- Brooks --=20 Any statement of the form "X is the one, true Y" is FALSE. PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4 --FL5UXtIhxfXey3p5 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQFB/rk/XY6L6fI4GtQRAnsrAJ9D30rB1yJcpv/26Xqy7NhaPKbFOQCg1IZt gAKwB8KInfJM0VdT4AVaTNg= =WBRO -----END PGP SIGNATURE----- --FL5UXtIhxfXey3p5--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050131230328.GA12221>