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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next prev parent reply other threads:[~2010-02-28 8:16 UTC|newest]
Thread overview: 17+ 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
[not found] ` <20100226.013637.255461265.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2010-02-26 14:46 ` Robert Hancock
2010-02-26 15:25 ` Bartlomiej Zolnierkiewicz
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 18:38 ` FUJITA Tomonori
[not found] ` <20100228033706G.fujita.tomonori-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>
2010-02-28 8:16 ` David Miller [this message]
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
2010-03-02 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
[not found] ` <51f3faa71002270959o4d1435e3xf67185fccaf50b18-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-02-27 18:38 ` FUJITA Tomonori
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