Date: Fri, 5 Jan 2018 16:11:06 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Eugene Grosbein <eugen@grosbein.net> Cc: Steven Hartland <smh@FreeBSD.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r327559 - in head: . sys/net Message-ID: <20180105131105.GB5368@zxy.spb.ru> In-Reply-To: <5A4E9397.9000308@grosbein.net> References: <201801042005.w04K5liB049411@repo.freebsd.org> <5A4E9397.9000308@grosbein.net>
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On Fri, Jan 05, 2018 at 03:50:31AM +0700, Eugene Grosbein wrote: > 05.01.2018 3:05, Steven Hartland wrote: > > > Author: smh > > Date: Thu Jan 4 20:05:47 2018 > > New Revision: 327559 > > URL: https://svnweb.freebsd.org/changeset/base/327559 > > > > Log: > > Disabled the use of flowid for lagg by default > > > > Disabled the use of RSS hash from the network card aka flowid for > > lagg(4) interfaces by default as it's currently incompatible with > > the lacp and loadbalance protocols. > > > > The incompatibility is due to the fact that the flowid isn't know > > for the first packet of a new outbound stream which can result in > > the hash calculation method changing and hence a stream being > > incorrectly split across multiple interfaces during normal > > operation. > > > > This can be re-enabled by setting the following in loader.conf: > > net.link.lagg.default_use_flowid="1" > > > > Discussed with: kmacy > > Sponsored by: Multiplay > > RSS by definition has meaning to received stream. What is "outbound" stream > in this context, why can the hash calculatiom method change and what exactly > does it mean "a stream being incorrectly split"? > > Defaults should not be changed so easily just because they are not optimal > for some specific case. Each lagg has its own setting for flowid usage > and why one cannot just use "ifconfig lagg0 -use_flowid" for such cases? Irrelevant to RSS and etc. flowid distribution in lacp case work very bad. This is good and must be MFC (IMHO).
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