From: Ming Zhang <mingz@ele.uri.edu>
To: open-iscsi <open-iscsi@googlegroups.com>
Cc: Dmitry Yusupov <dmitry_yus@yahoo.com>,
"David S. Miller" <davem@davemloft.net>,
mpm@selenic.com, andrea@suse.de, michaelc@cs.wisc.edu,
James.Bottomley@HansenPartnership.com,
ksummit-2005-discuss@thunk.org, netdev@oss.sgi.com
Subject: Re: Linux support for RDMA (was: [Ksummit-2005-discuss] Summary of 2005 Kernel Summit Proposed Topics)
Date: Mon, 04 Apr 2005 08:56:56 -0400 [thread overview]
Message-ID: <1112619415.2880.5.camel@localhost.localdomain> (raw)
In-Reply-To: <20050404063456.GB30855@colo.lackof.org>
yes, it travel 3 times instead of 1 time. and it is duplex. send traffic
will take another 20%. so total 80% or it can never run that fast.
ming
On Mon, 2005-04-04 at 02:34, Grant Grundler wrote:
> On Sun, Apr 03, 2005 at 05:56:11PM -0700, Dmitry Yusupov wrote:
> > I do not get your concern with memory BW. With good AMD box V40Z(SUN)
> > you can get 5.3GBytes/sec. Even with 10Gbps full speed you have 80%
> > left. PCI-X BUS BW is bigger concern...
>
> Yes and No. PCI-X isn't fast enough but the data only crosses
> the PCI-X bus once. Think about the data flow:
> 1) DMA to RAM
> 2) load into CPU cache
> 3) store back into RAM
>
> We are down to 40% left...graphics folks won't like you.
>
> grant
next prev parent reply other threads:[~2005-04-04 12:56 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-02 19:07 [Ksummit-2005-discuss] Summary of 2005 Kernel Summit ProposedTopics Asgeir Eiriksson
2005-04-02 19:14 ` Ming Zhang
2005-04-04 0:56 ` Linux support for RDMA (was: [Ksummit-2005-discuss] Summary of 2005 Kernel Summit Proposed Topics) Dmitry Yusupov
2005-04-04 6:34 ` Grant Grundler
2005-04-04 7:10 ` David S. Miller
2005-04-04 12:58 ` Ming Zhang
2005-04-04 16:31 ` Grant Grundler
2005-04-04 12:56 ` Ming Zhang [this message]
2005-04-04 16:54 ` Dmitry Yusupov
2005-04-04 19:11 ` Grant Grundler
-- strict thread matches above, loose matches on Subject: below --
2005-04-05 22:19 jaganav
2005-04-02 7:29 jaganav
2005-04-02 18:27 ` Matthew Wilcox
2005-04-03 1:26 ` Grant Grundler
2005-04-05 15:04 ` Rik van Riel
2005-04-01 2:13 jaganav
2005-04-01 23:43 ` Stephen Hemminger
2005-04-02 1:37 ` jaganav
2005-04-02 5:27 ` Greg KH
2005-04-02 6:02 ` Greg KH
2005-04-02 15:01 ` Andrea Arcangeli
2005-04-04 16:50 ` Stephen Hemminger
[not found] <4241D106.8050302@cs.wisc.edu>
[not found] ` <20050324101622S.fujita.tomonori@lab.ntt.co.jp>
[not found] ` <1111628393.1548.307.camel@beastie>
[not found] ` <20050324113312W.fujita.tomonori@lab.ntt.co.jp>
[not found] ` <1111633846.1548.318.camel@beastie>
[not found] ` <20050324215922.GT14202@opteron.random>
[not found] ` <424346FE.20704@cs.wisc.edu>
[not found] ` <20050324233921.GZ14202@opteron.random>
[not found] ` <20050325034341.GV32638@waste.org>
[not found] ` <20050327035149.GD4053@g5.random>
2005-03-27 5:48 ` [Ksummit-2005-discuss] Summary of 2005 Kernel Summit Proposed Topics Matt Mackall
2005-03-27 6:33 ` Dmitry Yusupov
2005-03-27 6:46 ` David S. Miller
2005-03-28 19:45 ` Roland Dreier
[not found] ` <1112042936.5088.22.camel@beastie>
2005-03-28 22:32 ` Benjamin LaHaise
2005-03-29 3:19 ` Linux support for RDMA (was: [Ksummit-2005-discuss] Summary of 2005 Kernel Summit Proposed Topics) Roland Dreier
2005-03-30 16:00 ` Benjamin LaHaise
2005-03-29 3:14 ` Roland Dreier
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