Date: Thu, 3 Jul 2014 14:29:01 +0400 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Nikolay Denev <ndenev@gmail.com> Cc: Kevin Oberman <rkoberman@gmail.com>, Sreenivasa Honnur <shonnur@chelsio.com>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: FreeBSD iscsi target Message-ID: <20140703102901.GQ5102@zxy.spb.ru> In-Reply-To: <CA%2BP_MZEJ=Gj4%2B8tKdZHAObjw-_riGLYLFOeiUXj9vn=JkwShmQ@mail.gmail.com> References: <20140701091252.GB3443@brick> <20140701231305.GA37246@zxy.spb.ru> <CAN6yY1t2qDzfeO37p2s_3=vzEVv5C813M0ttqjnM4tJGkkBhyA@mail.gmail.com> <20140702112609.GA85758@zxy.spb.ru> <CAN6yY1uzfjoDfEdti91Ogy11LzT3-5JvLREBdW6ynEOgm0uUPA@mail.gmail.com> <20140702203603.GO5102@zxy.spb.ru> <CAN6yY1von-Z586V=8qs3%2BOfV3oXes380s2GD-149EYWLxws-qA@mail.gmail.com> <CA%2BP_MZE013dv22Sb-rk7ZoiYbCTodmth0d-XpdM6mrpw3WxQmg@mail.gmail.com> <20140703091321.GP5102@zxy.spb.ru> <CA%2BP_MZEJ=Gj4%2B8tKdZHAObjw-_riGLYLFOeiUXj9vn=JkwShmQ@mail.gmail.com>
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On Thu, Jul 03, 2014 at 10:35:55AM +0100, Nikolay Denev wrote: > >> I found this white paper useful in understanding how this works : > >> http://www.cisco.com/c/en/us/products/collateral/switches/nexus-3000-series-switches/white_paper_c11-726674.pdf > > > > In real world "Reality is quite different than it actually is". > > http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-6500-series-switches/white_paper_c11-696669.html > > > > See "Packet Path Theory of Operation. Ingress Mode". > > > > Interesting, however this seems like implementation specific detail, > and not limitation of native 40Gbit ethernet. I see some perfomance tests on solaris and 40G link. In this test perfomance limited about 10Gbit per flow. May be I found links to this test. May be some NIC's implementation specific detail also limited performance per flow. > Still, it's something that one must be aware of (esp when dealing with > Cisco gear :) ) > > I wonder why they are not doing something like this : > http://blog.ipspace.net/2011/04/brocade-vcs-fabric-has-almost-perfect.html > > --Nikolay
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