From: Andi Kleen <andi@firstfloor.org>
To: Stephen Hemminger <shemminger@linux-foundation.org>
Cc: Andi Kleen <andi@firstfloor.org>,
David Miller <davem@davemloft.net>,
jeff@garzik.org, johnpol@2ka.mipt.ru,
herbert@gondor.apana.org.au, gaagaan@gmail.com,
Robert.Olsson@data.slu.se, netdev@vger.kernel.org,
rdreier@cisco.com, peter.p.waskiewicz.jr@intel.com,
hadi@cyberus.ca, mcarlson@broadcom.com, jagana@us.ibm.com,
general@lists.openfabrics.org, mchan@broadcom.com, tgraf@suug.ch,
randy.dunlap@oracle.com, sri@us.ibm.com, kaber@trash.net
Subject: Re: [ofa-general] Re: [PATCH 2/3][NET_BATCH] net core use batching
Date: Tue, 9 Oct 2007 20:30:27 +0200 [thread overview]
Message-ID: <20071009183027.GA552@one.firstfloor.org> (raw)
In-Reply-To: <20071009112225.5f9756e7@freepuppy.rosehill>
> I wonder about the whole idea of queueing in general at such high speeds.
> Given the normal bi-modal distribution of packets, and the predominance
> of 1500 byte MTU; does it make sense to even have any queueing in software
> at all?
Yes that is my point -- it should just pass it through directly
and the driver can then put it into the different per CPU (or per
whatever) queues managed by the hardware.
The only thing the qdisc needs to do is to set some bit that says
"it is ok to put this into difference queues; don't need strict ordering"
Otherwise if the drivers did that unconditionally they might cause
problems with other qdiscs.
This would also require that the driver exports some hint
to the upper layer on how large its internal queues are. A device
with a short queue would still require pfifo_fast. Long queue
devices could just pass through. That again could be a single flag.
-Andi
next prev parent reply other threads:[~2007-10-09 18:30 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-08 18:26 [PATCH 2/3][NET_BATCH] net core use batching jamal
2007-10-08 19:46 ` Waskiewicz Jr, Peter P
2007-10-08 20:48 ` jamal
2007-10-08 21:26 ` [ofa-general] " David Miller
2007-10-08 22:34 ` jamal
2007-10-08 22:36 ` [ofa-general] " Waskiewicz Jr, Peter P
2007-10-08 22:33 ` Waskiewicz Jr, Peter P
2007-10-08 23:40 ` jamal
2007-10-09 1:13 ` Jeff Garzik
2007-10-09 1:41 ` [ofa-general] " David Miller
2007-10-09 2:01 ` Herbert Xu
2007-10-09 2:03 ` Herbert Xu
2007-10-09 2:04 ` Herbert Xu
2007-10-09 2:15 ` jamal
2007-10-09 2:16 ` Herbert Xu
2007-10-09 2:19 ` [ofa-general] " jamal
2007-10-09 2:20 ` Herbert Xu
2007-10-09 2:45 ` [ofa-general] " David Miller
2007-10-09 2:43 ` David Miller
2007-10-09 2:46 ` Herbert Xu
2007-10-09 2:12 ` [ofa-general] " Jeff Garzik
2007-10-09 2:46 ` David Miller
2007-10-09 18:48 ` [ofa-general] " Waskiewicz Jr, Peter P
2007-10-09 19:04 ` Jeff Garzik
2007-10-09 19:07 ` Waskiewicz Jr, Peter P
2007-10-09 2:14 ` [ofa-general] " jamal
2007-10-09 2:16 ` Herbert Xu
2007-10-09 2:47 ` [ofa-general] " David Miller
2007-10-09 16:51 ` Andi Kleen
2007-10-09 18:22 ` Stephen Hemminger
2007-10-09 18:30 ` Andi Kleen [this message]
2007-10-09 20:43 ` David Miller
2007-10-09 20:53 ` Stephen Hemminger
2007-10-09 21:22 ` David Miller
2007-10-09 21:56 ` jamal
2007-10-10 0:04 ` David Miller
2007-10-10 0:37 ` Andi Kleen
2007-10-10 0:50 ` David Miller
2007-10-10 9:16 ` Andi Kleen
2007-10-10 9:25 ` David Miller
2007-10-10 10:23 ` Andi Kleen
2007-10-10 10:44 ` David Miller
2007-10-10 13:08 ` jamal
2007-10-10 22:37 ` David Miller
2007-10-10 15:35 ` Waskiewicz Jr, Peter P
2007-10-10 16:02 ` Andi Kleen
2007-10-10 16:42 ` Waskiewicz Jr, Peter P
2007-10-10 9:53 ` Herbert Xu
2007-10-12 16:08 ` Brandeburg, Jesse
2007-10-12 17:05 ` Stephen Hemminger
2007-10-12 18:29 ` Andi Kleen
2007-10-12 18:27 ` Andi Kleen
2007-10-10 16:02 ` Bill Fink
2007-10-10 22:53 ` David Miller
2007-10-11 6:52 ` Krishna Kumar2
2007-10-09 1:31 ` Jeff Garzik
2007-10-09 10:58 ` [ofa-general] " Krishna Kumar2
2007-10-09 11:02 ` David Miller
2007-10-09 11:20 ` [ofa-general] " Krishna Kumar2
2007-10-09 11:21 ` Krishna Kumar2
2007-10-09 11:24 ` David Miller
2007-10-09 12:44 ` [ofa-general] " Jeff Garzik
2007-10-09 12:55 ` Herbert Xu
2007-10-09 13:00 ` Jeff Garzik
2007-10-09 20:14 ` David Miller
2007-10-09 20:20 ` [ofa-general] " Jeff Garzik
2007-10-09 21:25 ` David Miller
2007-10-09 20:22 ` [ofa-general] " Roland Dreier
2007-10-09 20:51 ` David Miller
2007-10-09 21:40 ` Roland Dreier
2007-10-09 22:44 ` [ofa-general] " Roland Dreier
2007-10-09 22:46 ` [ofa-general] [PATCH 1/4] IPoIB: Fix unused variable warning Roland Dreier
2007-10-09 22:47 ` [ofa-general] [PATCH 2/4] ibm_emac: Convert to use napi_struct independent of struct net_device Roland Dreier
2007-10-09 22:47 ` [PATCH 3/4] ibm_new_emac: Nuke SET_MODULE_OWNER() use Roland Dreier
2007-10-09 22:48 ` [PATCH 4/4] ibm_emac: Convert to use napi_struct independent of struct net_device Roland Dreier
2007-10-09 22:51 ` [ofa-general] " Roland Dreier
2007-10-09 23:17 ` [PATCH 1/4] IPoIB: Fix unused variable warning David Miller
2007-10-10 0:32 ` Jeff Garzik
2007-10-10 0:47 ` [ofa-general] " Jeff Garzik
-- strict thread matches above, loose matches on Subject: below --
2007-10-08 13:17 [PATCH 2/3][NET_BATCH] net core use batching jamal
2007-10-09 3:09 ` [ofa-general] " Krishna Kumar2
2007-10-09 13:10 ` jamal
2007-09-14 9:00 [PATCH 0/10 REV5] Implement skb batching and support in IPoIB/E1000 Krishna Kumar
2007-09-16 23:17 ` [ofa-general] " David Miller
2007-09-17 0:29 ` jamal
2007-09-23 17:53 ` [PATCHES] TX batching jamal
2007-09-23 17:56 ` [ofa-general] [PATCH 1/4] [NET_SCHED] explict hold dev tx lock jamal
2007-09-23 17:58 ` [ofa-general] [PATCH 2/4] [NET_BATCH] Introduce batching interface jamal
2007-09-23 18:00 ` [PATCH 3/4][NET_BATCH] net core use batching jamal
2007-09-30 18:52 ` [ofa-general] [PATCH 2/3][NET_BATCH] " jamal
2007-10-01 4:11 ` Bill Fink
2007-10-01 13:30 ` jamal
2007-10-02 4:25 ` [ofa-general] " Bill Fink
2007-10-02 13:20 ` jamal
2007-10-03 5:29 ` [ofa-general] " Bill Fink
2007-10-01 10:42 ` Patrick McHardy
2007-10-01 13:21 ` jamal
2007-10-08 5:03 ` Krishna Kumar2
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