From: David Miller <davem@davemloft.net>
To: shemminger@linux-foundation.org
Cc: johnpol@2ka.mipt.ru, Robert.Olsson@data.slu.se,
herbert@gondor.apana.org.au, gaagaan@gmail.com, jeff@garzik.org,
rdreier@cisco.com, peter.p.waskiewicz.jr@intel.com,
hadi@cyberus.ca, mcarlson@broadcom.com, andi@firstfloor.org,
general@lists.openfabrics.org, netdev@vger.kernel.org,
tgraf@suug.ch, randy.dunlap@oracle.com, jagana@us.ibm.com,
kaber@trash.net, mchan@broadcom.com, sri@us.ibm.com
Subject: Re: [ofa-general] Re: [PATCH 2/3][NET_BATCH] net core use batching
Date: Tue, 09 Oct 2007 14:22:35 -0700 (PDT) [thread overview]
Message-ID: <20071009.142235.74385364.davem@davemloft.net> (raw)
In-Reply-To: <20071009135340.33e5922c@freepuppy.rosehill>
From: Stephen Hemminger <shemminger@linux-foundation.org>
Date: Tue, 9 Oct 2007 13:53:40 -0700
> I was thinking why not have a default transmit queue len of 0 like
> the virtual devices.
I'm not so sure.
Even if the device has "huge queues" I still think we need a software
queue for when the hardware one backs up.
It is even beneficial to stick with reasonably sized TX queues because
it keeps the total resident state accessed by the CPU within the
bounds of the L2 cache. If you go past that it actually hurts to make
the TX queue larger instead of helps even if it means you never hit
back pressure.
next prev parent reply other threads:[~2007-10-09 21:22 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
2007-10-09 20:43 ` David Miller
2007-10-09 20:53 ` Stephen Hemminger
2007-10-09 21:22 ` David Miller [this message]
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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