Date: Fri, 7 Jul 2006 22:38:01 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: User Freebsd <freebsd@hub.org> Cc: Pyun YongHyeon <pyunyh@gmail.com>, Peter Jeremy <peterjeremy@optushome.com.au>, Atanas <atanas@asd.aplus.net>, freebsd-stable@FreeBSD.org, Michael Vince <mv@thebeastie.org> Subject: Re: em device hangs on ifconfig alias ... Message-ID: <20060707223609.N60542@fledge.watson.org> In-Reply-To: <20060707181750.O1171@ganymede.hub.org> References: <20060629083130.X1229@ganymede.hub.org> <44A4A02A.9060802@thebeastie.org> <20060630012615.Q1103@ganymede.hub.org> <44A57B71.6020201@asd.aplus.net> <20060701035416.GC54876@cdnetworks.co.kr> <44AC6793.2070608@asd.aplus.net> <20060706021444.GA76865@cdnetworks.co.kr> <44AD7297.7080605@asd.aplus.net> <20060707010341.GD82406@cdnetworks.co.kr> <44ADC2ED.4070904@asd.aplus.net> <20060707040838.GE82406@cdnetworks.co.kr> <20060707151640.D51390@fledge.watson.org> <44AEB0CB.5060102@asd.aplus.net> <20060707181750.O1171@ganymede.hub.org>
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On Fri, 7 Jul 2006, User Freebsd wrote:
>> I think that I have patched, built and loaded the em(4) kernel module
>> correctly. After applying the patch there were no rejects, before building
>> the module I intentionally appended " (patched)" to its version string in
>> if_em.c, and could see that in dmesg every time I loaded the module: em1:
>> <Intel(R) PRO/1000 Network Connection Version - 3.2.18 (patched)>
>
> Is it possible that we're going at this issue backwards? It isn't the lack
> of ARP packet going out that is causing the problems with moving IPs, but
> that delay that we're seeing when aliasing a new IP on the stack? The ARP
> packet *is* being attempted, but is timing out before the re-init is
> completing?
Yes -- basically, there are two problems:
(1) A little problem, in which an arp announcement is sent before the link has
settled after reset.
(2) A big problem, in which the interface is gratuitously recent requiring
long settling times.
I'd really like to see a fix to the second of these problems (not resetting
when an IP is added or removed, resulting in link renegotiation); the first
one I'm less concerned about, although it would make some amount of sense to
do an arp announcement when the link goes up.
Robert N M Watson
Computer Laboratory
University of Cambridge
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