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Date:      Thu, 3 Jul 2014 10:28:19 -0700
From:      Adrian Chadd <adrian@freebsd.org>
To:        Slawa Olhovchenkov <slw@zxy.spb.ru>
Cc:        Nikolay Denev <ndenev@gmail.com>, Sreenivasa Honnur <shonnur@chelsio.com>, FreeBSD Current <freebsd-current@freebsd.org>, Kevin Oberman <rkoberman@gmail.com>
Subject:   Re: FreeBSD iscsi target
Message-ID:  <CAJ-Vmomfi2NmTzEsHfrpd9j1GOkLkXp%2B8pbRLShSOANUB1t21w@mail.gmail.com>
In-Reply-To: <20140703102901.GQ5102@zxy.spb.ru>
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> <20140703102901.GQ5102@zxy.spb.ru>

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Which NIC?


-a


On 3 July 2014 03:29, Slawa Olhovchenkov <slw@zxy.spb.ru> wrote:
> 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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