From: jamal <hadi@cyberus.ca>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David Miller <davem@davemloft.net>,
shemminger@osdl.org, mchan@broadcom.com,
jesse.brandeburg@intel.com, auke-jan.h.kok@intel.com,
"Edgar E. Iglesias" <edgar.iglesias@axis.com>,
netdev@vger.kernel.org
Subject: Re: [PATCH] [e1000]: Remove unnecessary tx_lock
Date: Mon, 07 Aug 2006 23:10:14 -0400 [thread overview]
Message-ID: <1155006614.5138.50.camel@jzny2> (raw)
In-Reply-To: <20060808021711.GA12795@gondor.apana.org.au>
On Tue, 2006-08-08 at 12:17 +1000, Herbert Xu wrote:
> CPU0 CPU1
> __qdisc_run
> netif_queue_stopped
> netif_wake_queue
> __netif_schedule
> test_bit
> clear_bit
>
> So you may end up losing that wake event.
Indeed you may.
I think what i was seeing is (motivating the patch to begin with) is:
if you got out of qdisc restart because driver returned TX_BUSY
leading to a netif_queue_stopped then you will have rescheduled on CPU0.
The only exception is the one example i mentioned in earlier email where
a TX_OK is returned by e1000.
> The QDISC_RUNNING bit was
> originally designed to be used under the qdisc lock, so using it
> in a different contexts will require new synchronisation mechanisms.
Agreed.
cheers,
jamal
next prev parent reply other threads:[~2006-08-08 3:10 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-03 13:15 [PATCH] [e1000]: Remove unnecessary tx_lock jamal
2006-08-03 14:02 ` Herbert Xu
2006-08-03 14:24 ` jamal
2006-08-03 16:36 ` Brandeburg, Jesse
2006-08-03 18:05 ` Michael Chan
2006-08-03 22:08 ` jamal
2006-08-04 0:09 ` Michael Chan
2006-08-04 1:10 ` Herbert Xu
2006-08-04 8:37 ` Herbert Xu
2006-08-04 10:10 ` Herbert Xu
2006-08-04 10:16 ` jamal
2006-08-04 10:25 ` Herbert Xu
2006-08-04 10:45 ` jamal
2006-08-05 23:04 ` jamal
2006-08-05 23:06 ` Herbert Xu
2006-08-05 23:21 ` jamal
2006-08-05 23:30 ` Herbert Xu
2006-08-05 16:45 ` jamal
2006-08-04 17:12 ` Stephen Hemminger
2006-08-04 17:28 ` Michael Chan
2006-08-04 18:08 ` Stephen Hemminger
2006-08-04 23:31 ` David Miller
2006-08-05 16:56 ` jamal
2006-08-05 23:05 ` Herbert Xu
2006-08-05 23:17 ` jamal
2006-08-05 23:19 ` Herbert Xu
2006-08-05 23:36 ` jamal
2006-08-06 2:51 ` Herbert Xu
2006-08-06 7:14 ` Edgar E. Iglesias
2006-08-06 7:24 ` Herbert Xu
2006-08-06 7:30 ` Edgar E. Iglesias
2006-08-06 7:26 ` David Miller
2006-08-06 7:36 ` Herbert Xu
2006-08-06 8:06 ` Edgar E. Iglesias
2006-08-06 8:27 ` Herbert Xu
2006-08-06 9:03 ` Edgar E. Iglesias
2006-08-06 9:10 ` Herbert Xu
2006-08-06 9:18 ` Edgar E. Iglesias
2006-08-06 8:35 ` David Miller
2006-08-06 12:24 ` jamal
2006-08-06 12:33 ` jamal
2006-08-06 23:16 ` Jesse Brandeburg
2006-08-07 12:50 ` jamal
2006-08-07 15:21 ` Edgar E. Iglesias
2006-08-07 15:40 ` jamal
2006-08-07 15:59 ` Edgar E. Iglesias
2006-08-07 16:31 ` Jamal Hadi Salim
2006-08-07 17:04 ` Edgar E. Iglesias
2006-08-07 18:00 ` jamal
2006-08-07 18:47 ` Edgar E. Iglesias
2006-08-07 19:03 ` jamal
2006-08-07 19:14 ` Edgar E. Iglesias
2006-08-07 19:34 ` jamal
2006-08-07 20:28 ` Edgar E. Iglesias
2006-08-08 0:52 ` jamal
2006-08-07 20:53 ` Brandeburg, Jesse
2006-08-08 1:07 ` jamal
2006-08-07 23:23 ` Herbert Xu
2006-08-07 23:35 ` Brandeburg, Jesse
2006-08-07 23:40 ` Herbert Xu
2006-08-07 16:29 ` Edgar E. Iglesias
2006-08-07 16:36 ` jamal
2006-08-06 19:22 ` jamal
2006-08-08 1:19 ` jamal
2006-08-08 1:22 ` Herbert Xu
2006-08-08 1:33 ` jamal
2006-08-08 2:17 ` Herbert Xu
2006-08-08 3:10 ` jamal [this message]
2006-08-08 12:21 ` jamal
2006-08-08 12:39 ` Herbert Xu
2006-08-06 17:20 ` Michael Chan
2006-08-06 23:04 ` Herbert Xu
2006-08-07 3:56 ` Michael Chan
2006-08-07 4:21 ` Herbert Xu
2006-08-08 17:04 ` Benjamin LaHaise
2006-08-08 22:06 ` David Miller
2006-08-08 23:21 ` Benjamin LaHaise
2006-08-09 0:25 ` Herbert Xu
2006-08-09 1:25 ` Benjamin LaHaise
2006-08-04 1:16 ` jamal
2006-08-04 1:18 ` Herbert Xu
2006-08-04 1:25 ` jamal
2006-08-04 4:06 ` Michael Chan
2006-08-03 22:06 ` jamal
-- strict thread matches above, loose matches on Subject: below --
2006-08-08 5:43 Brandeburg, Jesse
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