From: "Michael S. Tsirkin" <mst@mellanox.co.il>
To: "Bryan O'Sullivan" <bos@pathscale.com>
Cc: rolandd@cisco.com, gregkh@suse.de, akpm@osdl.org,
davem@davemloft.net, linux-kernel@vger.kernel.org,
openib-general@openib.org
Subject: Re: [openib-general] [PATCH 0 of 20] [RFC] ipath driver - another round for review
Date: Fri, 10 Mar 2006 17:35:59 +0200 [thread overview]
Message-ID: <20060310153559.GA12778@mellanox.co.il> (raw)
In-Reply-To: <patchbomb.1141950930@eng-12.pathscale.com>
Quoting r. Bryan O'Sullivan <bos@pathscale.com>:
> - We've added an ethernet emulation driver so that if you're not
> using Infiniband support, you still have a high-performance net
> device (lower latency and higher bandwidth than IPoIB) for IP
> traffic.
Two questions on this
1. It is not standard ethernet nor standard IP over Infiniband either, is it?
Is there some documentation on the wire protocol that you use?
Is it pathscale specific?
2. Are there practical reasons why you get lower latency and higher
bandwidth with this than with IPoIB? IP over IB simply encapsulates
each packet within a UD work request, so I don't see anything here that
might introduce extra latency or limit bandwidth.
If there are optimizations, can they not be added to the standard, common
IP over IB driver?
--
Michael S. Tsirkin
Staff Engineer, Mellanox Technologies
next prev parent reply other threads:[~2006-03-10 15:35 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-10 0:35 Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 1 of 20] ipath - core driver header files Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 2 of 20] ipath - core device driver Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 3 of 20] ipath - copy and send routines for sending an skb Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 4 of 20] ipath - support for HyperTransport devices Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 5 of 20] ipath - support for PCI Express devices Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 6 of 20] ipath - chip initialisation code Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 7 of 20] ipath - misc driver support code Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 8 of 20] ipath - sysfs support for core driver Bryan O'Sullivan
2006-03-10 1:11 ` Greg KH
2006-03-10 5:09 ` Bryan O'Sullivan
2006-03-05 3:08 ` Pavel Machek
2006-03-10 6:37 ` Greg KH
2006-03-10 14:59 ` Roland Dreier
2006-03-10 15:08 ` [openib-general] " Hal Rosenstock
2006-03-10 16:54 ` Greg KH
2006-03-10 17:05 ` Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 9 of 20] ipath - char devices for diagnostics and lightweight subnet management Bryan O'Sullivan
2006-03-10 0:45 ` Roland Dreier
2006-03-10 0:47 ` Bryan O'Sullivan
2006-03-10 0:52 ` Roland Dreier
2006-03-10 0:35 ` [PATCH 10 of 20] ipath - support for userspace apps using core driver Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 11 of 20] ipath - layering interfaces used by higher-level driver code Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 12 of 20] ipath - infiniband header files Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 13 of 20] ipath - infiniband UC and UD protocol support Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 14 of 20] ipath - infiniband RC " Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 15 of 20] ipath - misc infiniband code, part 1 Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 16 of 20] ipath - misc infiniband code, part 2 Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 17 of 20] ipath - infiniband verbs support Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 18 of 20] ipath - kbuild infrastructure Bryan O'Sullivan
2006-03-13 18:10 ` Adrian Bunk
2006-03-13 18:38 ` Robert Walsh
2006-03-13 19:24 ` Bryan O'Sullivan
2006-03-13 19:36 ` Sam Ravnborg
2006-03-13 19:39 ` Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 19 of 20] ipath - integrate driver into infiniband " Bryan O'Sullivan
2006-03-10 0:35 ` [PATCH 20 of 20] ipath - ethernet emulation driver Bryan O'Sullivan
2006-03-10 15:35 ` Michael S. Tsirkin [this message]
2006-03-10 16:02 ` [openib-general] [PATCH 0 of 20] [RFC] ipath driver - another round for review Bryan O'Sullivan
2006-03-10 17:48 ` Grant Grundler
2006-03-10 17:54 ` Bryan O'Sullivan
2006-03-10 22:30 ` Grant Grundler
2006-03-11 4:20 ` Bryan O'Sullivan
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