Date: Mon, 15 Sep 2008 10:28:17 -0700 From: "Li, Qing" <qing.li@bluecoat.com> To: "Alexandre Biancalana" <biancalana@gmail.com> Cc: freebsd-net@freebsd.org, Julian Elischer <julian@elischer.org>, Qing Li <qingli@freebsd.org> Subject: RE: ECMP Support Message-ID: <B583FBF374231F4A89607B4D08578A4301BFADE3@bcs-mail03.internal.cacheflow.com> In-Reply-To: <48CDE229.905@elischer.org> References: <8e10486b0809140950h6200dfdco5950f59d23718866@mail.gmail.com> <48CD4C11.6020104@FreeBSD.org> <8e10486b0809141053i69f9c4b5raffdad187ecd16eb@mail.gmail.com> <48CD506F.8090401@FreeBSD.org><8e10486b0809141456t48e799a0tcd74b605f2ad473f@mail.gmail.com> <48CDE229.905@elischer.org>
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I can't tell you if the current ECMP support is good enough for you without knowing what your requirements are. We are using the code in production environments (along with other pieces of=20 supporting infrastructure to perform our enhanced features). I know Barrett Lyon from BitGravity has been testing the code. I developed the code on FreeBSD 5.4 originally and I integrated the changes into -current, so I can't imagine it would be that hard=20 to get it working in the 7.x branch if that is what you need. The main issue of running the ECMP code in any release later than=20 the 5.4 release, is the lack of "inp_route" field that caches the route. In a system where the routing table changes frequently, the symptom would be packets of a flow could be spread across multiple paths, which could have serious impact on TCP performance. The "inp_route" field was removed in 5.4 release if I remembered correctly. I reintroduced this field in our custom releases. The "route" and "netstat" commands work with ECMP. There isn't much documentation but I do intend to update the manpages soon. Please indicate if there is any other command that you need. -- Qing =09 > -----Original Message----- > From: owner-freebsd-net@freebsd.org=20 > [mailto:owner-freebsd-net@freebsd.org] On Behalf Of Julian Elischer > Sent: Sunday, September 14, 2008 9:19 PM > To: Alexandre Biancalana > Cc: freebsd-net@freebsd.org; Qing Li > Subject: Re: ECMP Support >=20 > Alexandre Biancalana wrote: > > On 9/14/08, Bruce M. Simpson <bms@freebsd.org> wrote: > >> Alexandre Biancalana wrote: > >> > >>>> There is "multiple routing tables" support but that's not quite=20 > >>>> the > >> same > >>>> thing. > >>>> > >>>> > >>> Doesn't exists ?? So what's this commit message about ? > >>> > >>> > >> http://lists.freebsd.org/pipermail/cvs-src/2008-April/089956.html > >>> > >> Qing Li committed this support to -CURRENT but not RELENG_7. > >=20 > > Sure! Excuse my misunderstanding.... > >=20 > >> AFAIK there > >> hasn't been management tool support added, so further work=20 > is needed=20 > >> before it can be used. > >=20 > > There is any documentation about what have to be done ? >=20 > I suggest you talk to Qing. He is probably lurking.. > >=20 > > Thank you > > _______________________________________________ > > freebsd-net@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-net > > To unsubscribe, send any mail to=20 > "freebsd-net-unsubscribe@freebsd.org" >=20 > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >=20
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