Date: Wed, 18 Mar 2009 23:33:39 +1100 From: Nick Withers <nick@nickwithers.com> To: Robert Watson <rwatson@FreeBSD.org> Cc: freebsd-stable@freebsd.org Subject: Re: NICs locking up, "*tcp_sc_h" Message-ID: <1237379619.85532.55.camel@localhost> In-Reply-To: <alpine.BSF.2.00.0903181151240.99720@fledge.watson.org> References: <1236920519.1490.30.camel@localhost> <alpine.BSF.2.00.0903130935290.61873@fledge.watson.org> <alpine.BSF.2.00.0903130949210.61873@fledge.watson.org> <1237020646.1532.24.camel@localhost> <alpine.BSF.2.00.0903141756100.27597@fledge.watson.org> <1237081381.1581.2.camel@localhost> <alpine.BSF.2.00.0903181151240.99720@fledge.watson.org>
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--=-SiMUy3jaWYaZiOHMhr+1 Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Wed, 2009-03-18 at 11:52 +0000, Robert Watson wrote: > On Sun, 15 Mar 2009, Nick Withers wrote: >=20 > >> I'll need to think a bit about a proper fix for this, but you'll find = the=20 > >> problem likely goes away if you eliminate all uid/gid/jail rules from = your=20 > >> firewall. You could also tweak the syncache logic not to use a retran= smit=20 > >> timer, which might slightly extend the time it takes for systems to co= nnect=20 > >> to your host in the presence of packet loss, but would eliminate this=20 > >> transmission path entirely. We'll need a real and more general fix,=20 > >> however, to commit, and I'll look and see what I can come up with. > > > > Brilliant, thanks very much. I'll work without uid rules for the time b= eing,=20 > > then. >=20 > Could I ask you to file a PR on this problem, btw, with the two traces I=20 > singled out as interesting included, then forward me the PR receipt? Tha= t=20 > will make the problem easier to keep track of. Done - Please see newborn kern/132774! > We're currently pondering ways to fix the problem that don't disturb the=20 > stability of the ABI, and may have a workaround patch available shortly t= hat's=20 > appropriate for MFC. Wow! Must admit I'd assumed this one was going to take a while to sort out, so I'm certainly happy to hear this. Cheers very much! > Robert N M Watson > Computer Laboratory > University of Cambridge --=20 Nick Withers email: nick@nickwithers.com Web: http://www.nickwithers.com Mobile: +61 414 397 446 --=-SiMUy3jaWYaZiOHMhr+1 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.11 (FreeBSD) iEYEABECAAYFAknA6iMACgkQ3wcG/Pf4Wrix4gCeOPV/SlO7eHjrTidvmtL8TIPl m1IAn0UfQN/RAgQMnxqESgLAGDZIYlR/ =NnAG -----END PGP SIGNATURE----- --=-SiMUy3jaWYaZiOHMhr+1--
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