From: arnd@arndb•de (Arnd Bergmann)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v7 01/10] ARM: davinci: move private EDMA API to arm/common
Date: Mon, 4 Feb 2013 21:47:38 +0000 [thread overview]
Message-ID: <201302042147.38407.arnd@arndb.de> (raw)
In-Reply-To: <CACRpkdbPyZt8=pLhz-5qcaSSAk6VBn61dPTNp6teU9HksBwN2w@mail.gmail.com>
On Monday 04 February 2013, Linus Walleij wrote:
> So I think the above concerns are moot. The callback we can
> set on cookies is entirely optional, and it's even implemented by
> each DMA engine, and some may not even support it but require
> polling, and then it won't even be implemented by the driver.
Just to ensure that everybody is talking about the same thing here:
Is it just the callback that is optional, or also the interrupt
coming from the hardware? With NAPI, you want to avoid both, since
getting an interrupt for every packet adds noticeable overhead,
but you still want to be able to tell the hardware that you
are fed up with polling and would like to get an interrupt again
when the next data arrives (ideally, after either a little time
has passed after the next packet, or a specific number of packets
has arrived).
Arnd
next prev parent reply other threads:[~2013-02-04 21:47 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-01 18:22 [PATCH v7 00/10] DMA Engine support for AM33XX Matt Porter
2013-02-01 18:22 ` [PATCH v7 01/10] ARM: davinci: move private EDMA API to arm/common Matt Porter
2013-02-01 18:41 ` Tony Lindgren
2013-02-02 12:49 ` Russell King - ARM Linux
2013-02-02 14:44 ` Matt Porter
[not found] ` <5022f635a527470dbd0be932063e9cd2@DFLE72.ent.ti.com>
2013-02-01 18:49 ` Matt Porter
[not found] ` <2077c13e12314dc3adc8e5b653855da0@DFLE72.ent.ti.com>
2013-02-01 18:59 ` Matt Porter
2013-02-02 0:01 ` Sergei Shtylyov
2013-02-02 12:45 ` Russell King - ARM Linux
2013-02-02 17:27 ` Sergei Shtylyov
[not found] ` <e9be6668da8b4372a04687847daa1d8c@DFLE72.ent.ti.com>
2013-02-02 18:07 ` Matt Porter
2013-02-02 18:16 ` Tony Lindgren
2013-02-02 19:48 ` Matt Porter
2013-02-02 21:02 ` Tony Lindgren
2013-02-02 19:06 ` Sergei Shtylyov
[not found] ` <3245316d7aa94b2e823f98b69497547d@DLEE74.ent.ti.com>
2013-02-02 19:55 ` Matt Porter
2013-02-02 20:18 ` Sergei Shtylyov
2013-02-01 19:52 ` Sergei Shtylyov
2013-02-01 18:58 ` Felipe Balbi
2013-02-01 20:49 ` Sergei Shtylyov
2013-02-01 20:56 ` Felipe Balbi
2013-02-01 21:30 ` Russell King - ARM Linux
2013-02-02 0:07 ` Sergei Shtylyov
2013-02-02 0:44 ` Russell King - ARM Linux
2013-02-02 2:09 ` Sergei Shtylyov
2013-02-02 10:18 ` Russell King - ARM Linux
2013-02-02 12:17 ` Russell King - ARM Linux
2013-02-02 17:02 ` Sergei Shtylyov
2013-02-02 16:27 ` Sergei Shtylyov
2013-02-02 16:45 ` Russell King - ARM Linux
2013-02-02 17:17 ` Sergei Shtylyov
2013-02-04 14:27 ` Arnd Bergmann
2013-02-02 0:13 ` Sergei Shtylyov
2013-02-04 15:41 ` Felipe Balbi
2013-02-04 15:45 ` Russell King - ARM Linux
2013-02-04 17:36 ` Sergei Shtylyov
2013-02-04 16:47 ` Felipe Balbi
2013-02-04 17:10 ` Russell King - ARM Linux
2013-02-04 17:54 ` Sergei Shtylyov
2013-02-04 17:02 ` Felipe Balbi
2013-02-04 18:22 ` Sergei Shtylyov
2013-02-04 19:22 ` Cyril Chemparathy
2013-02-04 20:29 ` Linus Walleij
2013-02-04 20:33 ` Mark Brown
2013-02-04 21:11 ` Linus Walleij
2013-02-04 21:47 ` Arnd Bergmann [this message]
2013-02-05 12:38 ` Russell King - ARM Linux
2013-02-05 15:37 ` Cyril Chemparathy
2013-02-04 21:54 ` Cyril Chemparathy
2013-02-05 12:41 ` Russell King - ARM Linux
2013-02-05 15:42 ` Cyril Chemparathy
2013-02-05 15:30 ` Linus Walleij
2013-02-05 17:14 ` Russell King - ARM Linux
2013-02-05 18:33 ` Linus Walleij
2013-02-04 22:30 ` Cyril Chemparathy
2013-02-05 16:21 ` Linus Walleij
2013-02-05 16:47 ` Mark Brown
2013-02-05 17:06 ` Russell King - ARM Linux
2013-02-05 17:41 ` Mark Brown
2013-02-05 18:29 ` Linus Walleij
2013-02-05 19:45 ` Cyril Chemparathy
2013-02-05 18:28 ` Tony Lindgren
2013-02-05 22:26 ` Arnd Bergmann
2013-02-06 7:45 ` Felipe Balbi
2013-02-01 23:10 ` Sergei Shtylyov
2013-02-09 16:05 ` Sekhar Nori
2013-02-09 20:08 ` Russell King - ARM Linux
2013-03-04 22:05 ` Matt Porter
[not found] ` <e92425fefcc04bb4ab739ec8d4e82672@DLEE74.ent.ti.com>
2013-03-04 22:12 ` Matt Porter
2013-02-01 18:22 ` [PATCH v7 02/10] ARM: edma: remove unused transfer controller handlers Matt Porter
2013-02-01 18:22 ` [PATCH v7 03/10] ARM: edma: add AM33XX support to the private EDMA API Matt Porter
2013-02-01 18:22 ` [PATCH v7 04/10] dmaengine: edma: enable build for AM33XX Matt Porter
2013-02-01 18:22 ` [PATCH v7 05/10] dmaengine: edma: Add TI EDMA device tree binding Matt Porter
2013-02-01 18:26 ` Matt Porter
2013-02-01 18:22 ` [PATCH v7 06/10] ARM: dts: add AM33XX EDMA support Matt Porter
2013-02-01 18:22 ` [PATCH v7 07/10] dmaengine: add dma_request_slave_channel_compat() Matt Porter
2013-02-01 18:28 ` Matt Porter
2013-02-12 16:38 ` Vinod Koul
2013-02-01 18:22 ` [PATCH v7 08/10] spi: omap2-mcspi: convert to dma_request_slave_channel_compat() Matt Porter
2013-02-01 18:22 ` [PATCH v7 09/10] spi: omap2-mcspi: add generic DMA request support to the DT binding Matt Porter
2013-02-01 18:22 ` [PATCH v7 10/10] ARM: dts: add AM33XX SPI DMA support Matt Porter
2013-02-01 18:32 ` [PATCH v7 00/10] DMA Engine support for AM33XX Matt Porter
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