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From: David Miller <davem@davemloft.net>
To: fujita.tomonori@lab.ntt.co.jp
Cc: hancockrwd@gmail.com, bzolnier@gmail.com,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	linux-usb@vger.kernel.org
Subject: Re: [RFC PATCH] fix problems with NETIF_F_HIGHDMA in networking drivers
Date: Sun, 28 Feb 2010 00:16:28 -0800 (PST)	[thread overview]
Message-ID: <20100228.001628.48507956.davem@davemloft.net> (raw)
In-Reply-To: <20100228033706G.fujita.tomonori@lab.ntt.co.jp>

From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Date: Sun, 28 Feb 2010 03:38:19 +0900

> When I proposed such approach (always use swiotlb) before, IIRC,
> the objections were:
> 
> - better to make allocation respect dma_mask. (I don't think that this
>   approach is possible since we don't know which device handles data
>   later when we allocate memory).

And such objects might end up being processed by multiple devices with
different DMA restrictions.

> - swiotlb is not good for small systems since it allocates too much
>   memory (we can fix this though).

Indeed.

WARNING: multiple messages have this Message-ID (diff)
From: David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
To: fujita.tomonori-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org
Cc: hancockrwd-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	bzolnier-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [RFC PATCH] fix problems with NETIF_F_HIGHDMA in networking drivers
Date: Sun, 28 Feb 2010 00:16:28 -0800 (PST)	[thread overview]
Message-ID: <20100228.001628.48507956.davem@davemloft.net> (raw)
In-Reply-To: <20100228033706G.fujita.tomonori-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>

From: FUJITA Tomonori <fujita.tomonori-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>
Date: Sun, 28 Feb 2010 03:38:19 +0900

> When I proposed such approach (always use swiotlb) before, IIRC,
> the objections were:
> 
> - better to make allocation respect dma_mask. (I don't think that this
>   approach is possible since we don't know which device handles data
>   later when we allocate memory).

And such objects might end up being processed by multiple devices with
different DMA restrictions.

> - swiotlb is not good for small systems since it allocates too much
>   memory (we can fix this though).

Indeed.
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  reply	other threads:[~2010-02-28  8:16 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-02-23  2:45 [RFC PATCH] fix problems with NETIF_F_HIGHDMA in networking drivers Robert Hancock
2010-02-26  9:36 ` David Miller
2010-02-26 14:46   ` Robert Hancock
2010-02-26 14:46     ` Robert Hancock
2010-02-26 15:25     ` Bartlomiej Zolnierkiewicz
2010-02-27  3:08       ` Robert Hancock
2010-02-27  3:08         ` Robert Hancock
2010-02-27  9:53         ` David Miller
2010-02-27 11:59           ` Bartlomiej Zolnierkiewicz
2010-02-27 12:05             ` David Miller
2010-02-27 18:15               ` Robert Hancock
2010-02-27 18:15                 ` Robert Hancock
2010-02-27 18:38                 ` FUJITA Tomonori
2010-02-27 18:38                   ` FUJITA Tomonori
2010-02-28  8:16                   ` David Miller [this message]
2010-02-28  8:16                     ` David Miller
2010-03-01 16:34                     ` Was: Re: [RFC PATCH] fix problems with NETIF_F_HIGHDMA in networking, Now: SWIOTLB dynamic allocation Konrad Rzeszutek Wilk
2010-03-01 21:12                       ` Robert Hancock
2010-03-01 21:12                         ` Robert Hancock
2010-03-02  4:40                         ` FUJITA Tomonori
2010-03-02  4:40                           ` FUJITA Tomonori
2010-03-02  4:40                       ` FUJITA Tomonori
2010-02-27 17:59           ` [RFC PATCH] fix problems with NETIF_F_HIGHDMA in networking drivers Robert Hancock
2010-02-27 17:59             ` Robert Hancock
2010-02-27 18:38             ` FUJITA Tomonori
2010-02-27 18:38               ` FUJITA Tomonori

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