From: w@1wt.eu (Willy Tarreau)
To: linux-arm-kernel@lists.infradead.org
Subject: [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s
Date: Mon, 18 Nov 2013 11:51:50 +0100 [thread overview]
Message-ID: <20131118105150.GA26398@1wt.eu> (raw)
In-Reply-To: <20131118112601.65feb708@skate>
Hi Thomas,
On Mon, Nov 18, 2013 at 11:26:01AM +0100, Thomas Petazzoni wrote:
> I haven't read the entire discussion yet, but do you guys have
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/clk/mvebu?id=1022c75f5abd3a3b25e679bc8793d21bedd009b4
> applied? It got merged recently, and it fixes a number of networking
> problems on Armada 370.
No, because my version was even older than the code which introduced this
issue :-)
The main issue is related to something we discussed once ago which surprized
both of us, the use of a Tx timer to release the Tx descriptors. I remember
I considered that it was not a big issue because the flush was also done in
the Rx path (thus on ACKs) but I can't find trace of this code so my analysis
was wrong. Thus we can hit some situations where we fill the descriptors
before filling the link.
Ideally we should have a Tx IRQ. At the very least we should call the tx
refill function in mvneta_poll() I believe. I can try to do it but I'd
rather have the Tx IRQ working instead.
Regards,
Willy
WARNING: multiple messages have this Message-ID (diff)
From: Willy Tarreau <w@1wt.eu>
To: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Arnaud Ebalard <arno@natisbad.org>,
Cong Wang <xiyou.wangcong@gmail.com>,
edumazet@google.com, linux-arm-kernel@lists.infradead.org,
netdev@vger.kernel.org, simon.guinot@sequanux.org
Subject: Re: [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s
Date: Mon, 18 Nov 2013 11:51:50 +0100 [thread overview]
Message-ID: <20131118105150.GA26398@1wt.eu> (raw)
In-Reply-To: <20131118112601.65feb708@skate>
Hi Thomas,
On Mon, Nov 18, 2013 at 11:26:01AM +0100, Thomas Petazzoni wrote:
> I haven't read the entire discussion yet, but do you guys have
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/clk/mvebu?id=1022c75f5abd3a3b25e679bc8793d21bedd009b4
> applied? It got merged recently, and it fixes a number of networking
> problems on Armada 370.
No, because my version was even older than the code which introduced this
issue :-)
The main issue is related to something we discussed once ago which surprized
both of us, the use of a Tx timer to release the Tx descriptors. I remember
I considered that it was not a big issue because the flush was also done in
the Rx path (thus on ACKs) but I can't find trace of this code so my analysis
was wrong. Thus we can hit some situations where we fill the descriptors
before filling the link.
Ideally we should have a Tx IRQ. At the very least we should call the tx
refill function in mvneta_poll() I believe. I can try to do it but I'd
rather have the Tx IRQ working instead.
Regards,
Willy
next prev parent reply other threads:[~2013-11-18 10:51 UTC|newest]
Thread overview: 121+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-10 13:53 [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s Arnaud Ebalard
2013-11-10 13:53 ` Arnaud Ebalard
2013-11-12 6:48 ` Cong Wang
2013-11-12 6:48 ` Cong Wang
2013-11-12 7:56 ` Arnaud Ebalard
2013-11-12 7:56 ` Arnaud Ebalard
2013-11-12 8:36 ` Willy Tarreau
2013-11-12 8:36 ` Willy Tarreau
2013-11-12 9:14 ` Arnaud Ebalard
2013-11-12 9:14 ` Arnaud Ebalard
2013-11-12 10:01 ` Willy Tarreau
2013-11-12 10:01 ` Willy Tarreau
2013-11-12 15:34 ` Arnaud Ebalard
2013-11-12 15:34 ` Arnaud Ebalard
2013-11-13 7:22 ` Willy Tarreau
2013-11-13 7:22 ` Willy Tarreau
2013-11-17 14:19 ` Willy Tarreau
2013-11-17 14:19 ` Willy Tarreau
2013-11-17 17:41 ` Eric Dumazet
2013-11-17 17:41 ` Eric Dumazet
2013-11-19 6:44 ` Arnaud Ebalard
2013-11-19 6:44 ` Arnaud Ebalard
2013-11-19 13:53 ` Eric Dumazet
2013-11-19 13:53 ` Eric Dumazet
2013-11-19 17:43 ` Willy Tarreau
2013-11-19 17:43 ` Willy Tarreau
2013-11-19 18:31 ` Eric Dumazet
2013-11-19 18:31 ` Eric Dumazet
2013-11-19 18:41 ` Willy Tarreau
2013-11-19 18:41 ` Willy Tarreau
2013-11-19 23:53 ` Arnaud Ebalard
2013-11-19 23:53 ` Arnaud Ebalard
2013-11-20 0:08 ` Eric Dumazet
2013-11-20 0:08 ` Eric Dumazet
2013-11-20 0:35 ` Willy Tarreau
2013-11-20 0:35 ` Willy Tarreau
2013-11-20 0:43 ` Eric Dumazet
2013-11-20 0:43 ` Eric Dumazet
2013-11-20 0:52 ` Willy Tarreau
2013-11-20 0:52 ` Willy Tarreau
2013-11-20 8:50 ` Thomas Petazzoni
2013-11-20 8:50 ` Thomas Petazzoni
2013-11-20 19:21 ` Arnaud Ebalard
2013-11-20 19:11 ` Willy Tarreau
2013-11-20 19:11 ` Willy Tarreau
2013-11-20 19:26 ` Arnaud Ebalard
2013-11-20 19:26 ` Arnaud Ebalard
2013-11-20 21:28 ` Arnaud Ebalard
2013-11-20 21:28 ` Arnaud Ebalard
2013-11-20 21:54 ` Willy Tarreau
2013-11-20 21:54 ` Willy Tarreau
2013-11-21 0:44 ` Willy Tarreau
2013-11-21 0:44 ` Willy Tarreau
2013-11-21 18:38 ` ARM network performance and dma_mask (was: [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s) Willy Tarreau
2013-11-21 19:04 ` Thomas Petazzoni
2013-11-21 19:04 ` Thomas Petazzoni
2013-11-21 21:51 ` ARM network performance and dma_mask (was: [BUG, REGRESSION?] 3.11.6+, 3.12: " Willy Tarreau
2013-11-21 21:51 ` ARM network performance and dma_mask (was: [BUG,REGRESSION?] 3.11.6+,3.12: " Willy Tarreau
2013-11-21 22:01 ` ARM network performance and dma_mask Rob Herring
2013-11-21 22:01 ` Rob Herring
2013-11-21 22:13 ` Willy Tarreau
2013-11-21 22:13 ` Willy Tarreau
2013-11-21 21:51 ` [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s Arnaud Ebalard
2013-11-21 21:51 ` Arnaud Ebalard
2013-11-21 21:52 ` Willy Tarreau
2013-11-21 21:52 ` Willy Tarreau
2013-11-21 22:00 ` Eric Dumazet
2013-11-21 22:00 ` Eric Dumazet
2013-11-21 22:55 ` Arnaud Ebalard
2013-11-21 22:55 ` Arnaud Ebalard
2013-11-21 23:23 ` Rick Jones
2013-11-21 23:23 ` Rick Jones
2013-11-20 17:12 ` Willy Tarreau
2013-11-20 17:12 ` Willy Tarreau
2013-11-20 17:30 ` Eric Dumazet
2013-11-20 17:30 ` Eric Dumazet
2013-11-20 17:38 ` Willy Tarreau
2013-11-20 17:38 ` Willy Tarreau
2013-11-20 18:52 ` David Miller
2013-11-20 18:52 ` David Miller
2013-11-20 17:34 ` Willy Tarreau
2013-11-20 17:34 ` Willy Tarreau
2013-11-20 17:40 ` Eric Dumazet
2013-11-20 17:40 ` Eric Dumazet
2013-11-20 18:15 ` Willy Tarreau
2013-11-20 18:15 ` Willy Tarreau
2013-11-20 18:21 ` Eric Dumazet
2013-11-20 18:21 ` Eric Dumazet
2013-11-20 18:29 ` Willy Tarreau
2013-11-20 18:29 ` Willy Tarreau
2013-11-20 19:22 ` Arnaud Ebalard
2013-11-20 19:22 ` Arnaud Ebalard
2013-11-18 10:09 ` David Laight
2013-11-18 10:09 ` David Laight
2013-11-18 10:52 ` Willy Tarreau
2013-11-18 10:52 ` Willy Tarreau
2013-11-18 10:26 ` Thomas Petazzoni
2013-11-18 10:26 ` Thomas Petazzoni
2013-11-18 10:44 ` Simon Guinot
2013-11-18 10:44 ` Simon Guinot
2013-11-18 16:54 ` Stephen Hemminger
2013-11-18 16:54 ` Stephen Hemminger
2013-11-18 17:13 ` Eric Dumazet
2013-11-18 17:13 ` Eric Dumazet
2013-11-18 10:51 ` Willy Tarreau [this message]
2013-11-18 10:51 ` Willy Tarreau
2013-11-18 17:58 ` Florian Fainelli
2013-11-18 17:58 ` Florian Fainelli
2013-11-12 14:39 ` [PATCH] tcp: tsq: restore minimal amount of queueing Eric Dumazet
2013-11-12 15:24 ` Sujith Manoharan
2013-11-13 14:06 ` Eric Dumazet
2013-11-13 14:32 ` [PATCH v2] " Eric Dumazet
2013-11-13 21:18 ` Arnaud Ebalard
2013-11-13 21:59 ` Holger Hoffstaette
2013-11-13 23:40 ` Eric Dumazet
2013-11-13 23:52 ` Holger Hoffstaette
2013-11-17 23:15 ` Francois Romieu
2013-11-18 16:26 ` Holger Hoffstätte
2013-11-18 16:47 ` Eric Dumazet
2013-11-13 22:41 ` Eric Dumazet
2013-11-14 21:26 ` David Miller
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