Date: Tue, 21 Dec 2010 13:41:20 +0600 From: Eugene Grosbein <egrosbein@rdtc.ru> To: Shtorm <admin@shtorm.com> Cc: net@freebsd.org Subject: Re: lagg/lacp poor traffic distribution Message-ID: <4D105A20.306@rdtc.ru> In-Reply-To: <4D105800.2070808@rdtc.ru> References: <4D0CFEFF.3000902@rdtc.ru> <1292844095.1917.136.camel@stormi> <4D105800.2070808@rdtc.ru>
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On 21.12.2010 13:32, Eugene Grosbein wrote: >> I had this problem with igb driver, and I found, that lagg selects >> outgoing interface based on packet header flowid field if M_FLOWID field >> is set. And in the igb driver code flowid is set as >> >> #if __FreeBSD_version >= 800000 >> <------><------><------>rxr->fmp->m_pkthdr.flowid = que->msix; >> <------><------><------>rxr->fmp->m_flags |= M_FLOWID; >> #endif >> >> The same thing in em driver with MULTIQUEUE >> >> That does not give enough number of flows to balance traffic well, so I >> commented check in if_lagg.c >> >> lagg_lb_start(struct lagg_softc *sc, struct mbuf *m) >> { >> <------>struct lagg_lb *lb = (struct lagg_lb *)sc->sc_psc; >> <------>struct lagg_port *lp = NULL; >> <------>uint32_t p = 0; >> >> //<---->if (m->m_flags & M_FLOWID) >> //<----><------>p = m->m_pkthdr.flowid; >> //<---->else >> >> and with this change I have much better load distribution across interfaces. >> >> Hope it helps. >> > > I've made new sysctl net.link.lagg.use_flows to enable/disable > this code in run time and disabled it. No change. > > --- if_lagg.c.orig 2010-12-20 22:53:21.000000000 +0600 > +++ if_lagg.c 2010-12-20 22:57:50.000000000 +0600 I've just found LACP mode does not use code in place I've patched. Instead, I should make the change to lacp_select_tx_port() into ieee8023ad_lacp.c. Sorry for noise, I'll try again.
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