From: Andi Kleen <ak@suse.de>
To: Muli Ben-Yehuda <mulix@mulix.org>
Cc: Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>,
Ravikiran G Thirumalai <kiran@scalex86.org>,
linux-kernel@vger.kernel.org, discuss@x86-64.org,
tglx@linutronix.de, shai@scalex86.org
Subject: Re: x86_64: 2.6.14-rc4 swiotlb broken
Date: Mon, 17 Oct 2005 18:02:09 +0200 [thread overview]
Message-ID: <200510171802.09708.ak@suse.de> (raw)
In-Reply-To: <20051017155613.GF21783@granada.merseine.nu>
On Monday 17 October 2005 17:56, Muli Ben-Yehuda wrote:
> On Mon, Oct 17, 2005 at 05:40:56PM +0200, Andi Kleen wrote:
> > First this problem is definitely not critical. AFAIK it only happens on
> > scalex's unreleased machines. Intel NUMA x86 machines are really rare
> > and on AMD it doesn't happen because the swiotlb is not used there.
>
> It's not used by default, but there are cases where it's used and it
> would be a shame to release a major kernel and knowingly break
> them. For example, any setup that used iommu_force or any non-AMD
> x86-64 machine with more than 4GB of memory and only 32-bit capable
> DMA devices.
... but risk breaking other stuff. Unless you can get the ARM and/or IA64
people to do some retesting with the proposed fixes it's quite risky.
Sometimes you have to make compromises before releases.
> Another alternative is to temporarily
> provide a different version of swiotlb_init() for x86-64 and IA64 -
> I can whip up a patch if that's acceptable.
I don't want that.
-Andi
next prev parent reply other threads:[~2005-10-17 16:01 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-17 9:36 x86_64: 2.6.14-rc4 swiotlb broken Ravikiran G Thirumalai
2005-10-17 9:50 ` Andrew Morton
2005-10-17 9:53 ` Andi Kleen
2005-10-17 10:54 ` Yasunori Goto
2005-10-17 15:27 ` Linus Torvalds
2005-10-17 15:37 ` Ravikiran G Thirumalai
2005-10-17 15:40 ` Andi Kleen
2005-10-17 15:56 ` Muli Ben-Yehuda
2005-10-17 16:02 ` Andi Kleen [this message]
2005-10-17 18:53 ` [discuss] " Russell King
2005-10-17 16:02 ` Linus Torvalds
2005-10-17 16:26 ` Andi Kleen
2005-10-17 16:42 ` Linus Torvalds
2005-10-17 17:09 ` Andi Kleen
2005-10-17 17:52 ` Ravikiran G Thirumalai
2005-10-17 18:08 ` [discuss] " Andi Kleen
2005-10-17 18:27 ` Muli Ben-Yehuda
2005-10-17 18:32 ` Andi Kleen
2005-10-17 18:45 ` Muli Ben-Yehuda
2005-10-17 19:04 ` Linus Torvalds
2005-10-17 19:09 ` Andi Kleen
2005-10-17 19:15 ` Arjan van de Ven
2005-10-17 19:47 ` Ravikiran G Thirumalai
2005-10-17 23:50 ` David Lang
2005-10-18 2:29 ` Yasunori Goto
2005-10-18 3:20 ` Ravikiran G Thirumalai
2005-10-18 4:28 ` Yasunori Goto
2005-10-18 6:13 ` Ravikiran G Thirumalai
2005-10-18 10:09 ` Yasunori Goto
2005-10-18 18:51 ` Ravikiran G Thirumalai
2005-10-19 17:18 ` Jon Mason
2005-10-20 7:27 ` Andi Kleen
2005-10-17 18:38 ` Ravikiran G Thirumalai
2005-10-17 18:20 ` Christoph Lameter
2005-10-17 19:04 ` Alex Williamson
2005-10-17 19:26 ` Ravikiran G Thirumalai
2005-10-17 19:52 ` Alex Williamson
2005-10-17 15:30 ` Ravikiran G Thirumalai
2005-10-17 15:43 ` Andi Kleen
2005-10-17 20:44 ` Andrew Morton
2005-10-17 21:11 ` Linus Torvalds
2005-10-18 0:16 ` Ravikiran G Thirumalai
2005-10-18 8:23 ` Andi Kleen
2005-10-18 19:07 ` [discuss] " Ravikiran G Thirumalai
2005-10-18 15:48 ` Linus Torvalds
2005-10-18 15:50 ` Linus Torvalds
2005-10-18 19:54 ` [discuss] " Ravikiran G Thirumalai
2005-10-18 21:28 ` Alex Williamson
2005-10-18 21:53 ` Ravikiran G Thirumalai
2005-10-18 22:04 ` Alex Williamson
2005-10-18 22:37 ` Alex Williamson
2005-10-18 23:22 ` Ravikiran G Thirumalai
2005-10-19 1:22 ` Alex Williamson
2005-10-19 2:02 ` Alex Williamson
2005-10-19 12:47 ` Yasunori Goto
2005-10-19 14:19 ` Alex Williamson
2005-10-19 18:07 ` Ravikiran G Thirumalai
2005-10-19 20:45 ` Linus Torvalds
2005-10-19 22:52 ` Ravikiran G Thirumalai
2005-10-20 0:51 ` Yasunori Goto
2005-10-20 7:45 ` Andi Kleen
2005-10-18 22:47 ` Ravikiran G Thirumalai
2005-10-17 10:02 ` Muli Ben-Yehuda
2005-10-17 19:07 ` Tony Luck
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