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From: Dan Williams <dan.j.williams@intel.com>
To: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Cc: "Sosnowski, Maciej" <maciej.sosnowski@intel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] dw_dmac: set CAP_PRIVATE capability for DW DMA controller
Date: Tue, 31 Mar 2009 22:30:23 -0700	[thread overview]
Message-ID: <49D2FBEF.7080607@intel.com> (raw)
In-Reply-To: <20090401070440.326f6e7f@hcegtvedt>

Hans-Christian Egtvedt wrote:
> The weird part was that when testing this, the dma_request_channel()
> would not return any channel before DMA_PRIVATE flag was set. I think I
> did this some time ago, I can do a retest with the current 2.6.29 and
> see how it behaves.
> 

If CONFIG_NET_DMA=y then available channels will be consumed for 
'public' usage.  I would turn that option off for AVR32 as it hurts 
performance on dma-incoherent archs like ARM.  Async_tx will also 
consume public channels if loaded.  2.6.30 will have the 
CONFIG_ASYNC_TX_DMA option to turn off this allocation... or just set 
DMA_PRIVATE and not worry these :-).

--
Dan

  reply	other threads:[~2009-04-01  5:30 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-03-24 11:35 [PATCH 1/2] dw_dmac: set CAP_PRIVATE capability for DW DMA controller Hans-Christian Egtvedt
2009-03-24 11:35 ` [PATCH 2/2] dw_dmac: add cyclic API to DW DMA driver Hans-Christian Egtvedt
2009-03-31 14:02   ` Sosnowski, Maciej
2009-03-31 14:03   ` Sosnowski, Maciej
2009-04-01  5:10     ` Hans-Christian Egtvedt
2009-04-01  8:28     ` Haavard Skinnemoen
2009-04-01  9:11       ` Hans-Christian Egtvedt
2009-04-01 13:28         ` [PATCH v2 1/1] " Hans-Christian Egtvedt
2009-04-01 13:39           ` Haavard Skinnemoen
2009-04-01 13:47             ` [PATCH v3 " Hans-Christian Egtvedt
2009-04-01 13:52               ` Haavard Skinnemoen
2009-04-01 22:46                 ` Dan Williams
2009-04-01 15:08               ` Sosnowski, Maciej
2009-03-31 14:01 ` [PATCH 1/2] dw_dmac: set CAP_PRIVATE capability for DW DMA controller Sosnowski, Maciej
2009-04-01  5:04   ` Hans-Christian Egtvedt
2009-04-01  5:30     ` Dan Williams [this message]
2009-04-01  8:33     ` Hans-Christian Egtvedt

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