From: Andi Kleen <andi@firstfloor.org>
To: "Felix Marti" <felix@chelsio.com>
Cc: "David Miller" <davem@davemloft.net>, <sean.hefty@intel.com>,
<netdev@vger.kernel.org>, <rdreier@cisco.com>,
<general@lists.openfabrics.org>, <linux-kernel@vger.kernel.org>,
<jeff@garzik.org>
Subject: Re: [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate PS_TCPportsfrom the host TCP port space.
Date: 20 Aug 2007 13:07:06 +0200 [thread overview]
Message-ID: <p733aye1n39.fsf@bingen.suse.de> (raw)
In-Reply-To: <8A71B368A89016469F72CD08050AD334018E20C1@maui.asicdesigners.com>
"Felix Marti" <felix@chelsio.com> writes:
> > avoidance gains of TSO and LRO are still a very worthwhile savings.
> So, i.e. with TSO, your saving about 16 headers (let us say 14 + 20 +
> 20), 864B, when moving ~64KB of payload - looks like very much in the
> noise to me.
TSO is beneficial for the software again. The linux code currently
takes several locks and does quite a few function calls for each
packet and using larger packets lowers this overhead. At least with
10GbE saving CPU cycles is still quite important.
> an option to get 'high performance'
Shouldn't you qualify that?
It is unlikely you really duplicated all the tuning for corner cases
that went over many years into good software TCP stacks in your
hardware. So e.g. for wide area networks with occasional packet loss
the software might well perform better.
-Andi
next prev parent reply other threads:[~2007-08-20 10:13 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-07 14:37 [PATCH RFC] RDMA/CMA: Allocate PS_TCP ports from the host TCP port space Steve Wise
2007-08-07 14:54 ` Evgeniy Polyakov
2007-08-07 15:06 ` Steve Wise
2007-08-07 15:39 ` Evgeniy Polyakov
2007-08-09 18:49 ` Steve Wise
2007-08-09 21:40 ` [ofa-general] " Sean Hefty
2007-08-09 21:55 ` David Miller
2007-08-09 23:22 ` Sean Hefty
2007-08-15 14:42 ` Steve Wise
2007-08-16 2:26 ` Jeff Garzik
2007-08-16 3:11 ` Roland Dreier
2007-08-16 3:27 ` [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate PS_TCP portsfrom " Sean Hefty
2007-08-16 13:43 ` [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate PS_TCP ports from " Tom Tucker
2007-08-16 21:17 ` David Miller
2007-08-17 19:52 ` Roland Dreier
2007-08-17 21:27 ` David Miller
2007-08-17 23:31 ` Roland Dreier
2007-08-18 0:00 ` David Miller
2007-08-18 5:23 ` Roland Dreier
2007-08-18 6:44 ` David Miller
2007-08-19 7:01 ` [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate PS_TCP portsfrom " Sean Hefty
2007-08-19 7:23 ` David Miller
2007-08-19 17:33 ` [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate PS_TCPportsfrom " Felix Marti
2007-08-19 19:32 ` David Miller
2007-08-19 19:49 ` Felix Marti
2007-08-19 23:04 ` David Miller
2007-08-20 0:32 ` Felix Marti
2007-08-20 0:40 ` David Miller
2007-08-20 0:47 ` Felix Marti
2007-08-20 1:05 ` David Miller
2007-08-20 1:41 ` Felix Marti
2007-08-20 11:07 ` Andi Kleen [this message]
2007-08-20 16:26 ` Felix Marti
2007-08-20 19:16 ` Rick Jones
2007-08-20 9:43 ` Evgeniy Polyakov
2007-08-20 16:53 ` Felix Marti
2007-08-20 18:10 ` Andi Kleen
2007-08-20 19:02 ` Felix Marti
2007-08-20 20:18 ` Thomas Graf
2007-08-20 20:33 ` Andi Kleen
2007-08-20 20:33 ` Patrick Geoffray
2007-08-21 4:21 ` Felix Marti
2007-08-19 23:27 ` Andi Kleen
2007-08-19 23:12 ` David Miller
2007-08-20 1:45 ` Felix Marti
2007-08-20 0:18 ` Herbert Xu
2007-08-21 1:16 ` [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate PS_TCP ports from " Roland Dreier
2007-08-21 6:58 ` David Miller
2007-08-28 19:38 ` Roland Dreier
2007-08-28 20:43 ` David Miller
2007-10-08 21:54 ` Steve Wise
2007-10-09 13:44 ` James Lentini
2007-10-10 21:01 ` Sean Hefty
2007-10-10 23:04 ` David Miller
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