From: Andi Kleen <ak@muc.de>
To: Andrea Arcangeli <andrea@suse.de>
Cc: jamal <hadi@cyberus.ca>, Dmitry Yusupov <dmitry_yus@yahoo.com>,
James Bottomley <James.Bottomley@HansenPartnership.com>,
Rik van Riel <riel@redhat.com>,
mpm@selenic.com, michaelc@cs.wisc.edu,
open-iscsi@googlegroups.com, ksummit-2005-discuss@thunk.org,
netdev <netdev@oss.sgi.com>
Subject: Re: [Ksummit-2005-discuss] Summary of 2005 Kernel Summit Proposed Topics
Date: 31 Mar 2005 13:50:12 +0200
Date: Thu, 31 Mar 2005 13:50:12 +0200 [thread overview]
Message-ID: <20050331115012.GP24804@muc.de> (raw)
In-Reply-To: <20050330161522.GH32111@g5.random>
On Wed, Mar 30, 2005 at 06:15:22PM +0200, Andrea Arcangeli wrote:
> On Wed, Mar 30, 2005 at 06:02:55PM +0200, Andi Kleen wrote:
> > On Wed, Mar 30, 2005 at 05:44:18PM +0200, Andrea Arcangeli wrote:
> > > On Wed, Mar 30, 2005 at 05:39:48PM +0200, Andi Kleen wrote:
> > > > An unsolveable one IMHO. You can just try to be good enough. For that
> > >
> > > I think it's solvable with an algorithm I outlined several emails ago.
> >
> > The problem with you algorithm is that you cannot control
> > how to NIC puts incoming packets into RX rings (and then
> > actually if the packets you are interested in do actually arrive from
> > the net ,-)
>
> All I care about is to assign a mempool ID to the skb (ID being unique
> identifier for the tcp connection I don't care how the implementation
> is). If while moving up the stack the skb data doesn't match to the
> sock->mempool id, we'll just free the packet and put it back in the
> mempool.
This could still starve on the RX ring level of the hardware which
you cant control.
But it might be an improvement, agreed. The problem is that you
need lots of infrastructure to tell the driver about TCP connections -
it is pretty much near all the work needed for zero copy RX.
Even with all that work it is not the 100% solution some people on this thread
seem to be lusting for.
-Andi
next prev parent reply other threads:[~2005-03-31 11:50 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
[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 6:04 ` Andrea Arcangeli
2005-03-27 6:38 ` Matt Mackall
2005-03-27 14:50 ` Andrea Arcangeli
2005-03-27 6:33 ` Dmitry Yusupov
2005-03-27 6:46 ` David S. Miller
2005-03-27 7:05 ` Dmitry Yusupov
2005-03-27 7:57 ` David S. Miller
2005-03-27 8:18 ` Dmitry Yusupov
2005-03-27 18:26 ` Mike Christie
2005-03-27 18:31 ` David S. Miller
2005-03-27 19:58 ` Matt Mackall
2005-03-27 21:49 ` Dmitry Yusupov
2005-03-27 18:47 ` Dmitry Yusupov
2005-03-27 21:14 ` Alex Aizman
[not found] ` <20050327211506.85EDA16022F6@mx1.suse.de>
2005-03-28 0:15 ` Andrea Arcangeli
2005-03-28 3:54 ` Rik van Riel
2005-03-28 4:34 ` David S. Miller
2005-03-28 4:50 ` Rik van Riel
2005-03-28 6:58 ` Alex Aizman
2005-03-28 16:12 ` Andi Kleen
2005-03-28 16:22 ` Andrea Arcangeli
2005-03-28 16:24 ` Rik van Riel
2005-03-29 15:11 ` Andi Kleen
2005-03-29 15:29 ` Rik van Riel
2005-03-29 17:03 ` Matt Mackall
2005-03-28 16:28 ` James Bottomley
2005-03-29 15:20 ` Andi Kleen
2005-03-29 15:56 ` James Bottomley
2005-03-29 17:19 ` Dmitry Yusupov
2005-03-29 21:08 ` jamal
2005-03-29 22:00 ` Rik van Riel
2005-03-29 22:17 ` Matt Mackall
2005-03-29 23:30 ` jamal
2005-03-29 23:00 ` jamal
2005-03-29 23:25 ` Matt Mackall
2005-03-30 0:30 ` H. Peter Anvin
2005-03-30 15:24 ` Andi Kleen
2005-03-29 22:03 ` Rick Jones
2005-03-29 23:13 ` jamal
2005-03-30 2:28 ` Alex Aizman
[not found] ` <E1DGSwp-0004ZE-00@thunker.thunk.org>
2005-03-30 17:16 ` Grant Grundler
2005-03-30 18:46 ` Dmitry Yusupov
2005-03-30 15:22 ` Andi Kleen
2005-03-30 15:33 ` Andrea Arcangeli
2005-03-30 15:38 ` Rik van Riel
2005-03-30 15:39 ` Andi Kleen
2005-03-30 15:44 ` Andrea Arcangeli
2005-03-30 15:50 ` Rik van Riel
2005-03-30 16:04 ` James Bottomley
2005-03-30 17:48 ` H. Peter Anvin
2005-03-30 16:02 ` Andi Kleen
2005-03-30 16:15 ` Andrea Arcangeli
2005-03-30 16:55 ` jamal
2005-03-30 18:42 ` Rik van Riel
2005-03-30 19:28 ` Alex Aizman
2005-03-31 11:41 ` Andi Kleen
2005-03-31 12:12 ` Rik van Riel
2005-03-31 18:59 ` Andi Kleen
2005-03-31 19:04 ` Rik van Riel
2005-03-31 15:35 ` Grant Grundler
2005-03-31 19:15 ` Alex Aizman
2005-03-31 19:34 ` Andi Kleen
2005-03-31 19:39 ` Rik van Riel
2005-03-31 11:45 ` Andi Kleen
2005-03-31 11:50 ` Andi Kleen [this message]
2005-03-31 17:09 ` Andrea Arcangeli
2005-03-31 22:05 ` Dmitry Yusupov
2005-03-30 17:24 ` Matt Mackall
2005-03-30 17:39 ` Dmitry Yusupov
2005-03-30 20:10 ` Mike Christie
2005-03-30 17:07 ` Grant Grundler
2005-03-30 5:12 ` H. Peter Anvin
2005-03-28 16:37 ` Dmitry Yusupov
2005-03-28 19:45 ` Roland Dreier
2005-03-28 20:32 ` Topic: Remote DMA network technologies Gerrit Huizenga
2005-03-28 20:36 ` Roland Dreier
[not found] ` <1112042936.5088.22.camel@beastie>
2005-03-28 22:32 ` [Ksummit-2005-discuss] Summary of 2005 Kernel Summit Proposed Topics 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
2005-03-31 1:08 ` Linux support for RDMA H. Peter Anvin
2005-04-02 18:08 ` [Ksummit-2005-discuss] Summary of 2005 Kernel Summit Proposed Topics Dmitry Yusupov
2005-04-02 19:13 ` Ming Zhang
2005-04-04 6:31 ` Grant Grundler
2005-04-04 18:57 ` Rick Jones
2005-03-29 3:14 ` Linux support for RDMA (was: [Ksummit-2005-discuss] Summary of 2005 Kernel Summit Proposed Topics) Roland Dreier
[not found] <42472259.2866086e.3169.318fSMTPIN_ADDED@mx.googlegroups.com>
2005-03-27 21:18 ` [Ksummit-2005-discuss] Summary of 2005 Kernel Summit Proposed Topics Alex Aizman
2005-03-27 21:53 Alex Aizman
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