From: "H. Peter Anvin" <hpa@zytor.com>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
WANG Chao <chaowang@redhat.com>, Vivek Goyal <vgoyal@redhat.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] x86, kdump: Set crashkernel_low automatically
Date: Mon, 18 Mar 2013 15:52:29 -0700 [thread overview]
Message-ID: <51479AAD.7040209@zytor.com> (raw)
In-Reply-To: <1363641957-5247-1-git-send-email-yinghai@kernel.org>
On 03/18/2013 02:25 PM, Yinghai Lu wrote:
> Current code does not set low range for crashkernel if the user
> does not specify that.
>
> That cause regressions on system that does not support intel_iommu
> properly.
>
> Chao said that his system does work well on 3.8 without extra parameter.
> even iommu does not work with kdump.
>
> Set crashkernel_low automatically if the user does not specify that.
>
> For system that does support IOMMU with kdump properly, user could
> specify crashkernel_low=0 to save that 72M low ram.
>
> -v3: add swiotlb_size() according to Konrad.
>
> Reported-by: WANG Chao <chaowang@redhat.com>
> Tested-by: WANG Chao <chaowang@redhat.com>
> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Can we get a bit more of an explanation instead of "and etc 8M"? At
least a hint of what kind of objects would go in there...
-hpa
next prev parent reply other threads:[~2013-03-18 22:54 UTC|newest]
Thread overview: 120+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-08 5:54 3.9-rc1: crash kernel panic - not syncing: Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer WANG Chao
2013-03-08 6:03 ` CAI Qian
2013-03-08 6:03 ` CAI Qian
2013-03-08 6:32 ` Yinghai Lu
2013-03-08 6:32 ` Yinghai Lu
2013-03-08 6:36 ` Yinghai Lu
2013-03-08 6:36 ` Yinghai Lu
2013-03-08 7:20 ` WANG Chao
2013-03-08 7:20 ` WANG Chao
2013-03-08 7:27 ` Yinghai Lu
2013-03-08 7:27 ` Yinghai Lu
2013-03-08 7:33 ` WANG Chao
2013-03-08 7:33 ` WANG Chao
2013-03-08 7:50 ` Yinghai Lu
2013-03-08 7:50 ` Yinghai Lu
2013-03-08 12:12 ` WANG Chao
2013-03-08 18:24 ` Yinghai Lu
2013-03-08 18:24 ` Yinghai Lu
2013-03-08 19:39 ` Yinghai Lu
2013-03-08 19:39 ` Yinghai Lu
2013-03-11 3:42 ` WANG Chao
2013-03-11 3:42 ` WANG Chao
2013-03-11 4:56 ` [PATCH] x86, kdump: Set crashkernel_low automatically Yinghai Lu
2013-03-11 14:48 ` Vivek Goyal
2013-03-11 15:02 ` Vivek Goyal
2013-03-11 17:58 ` Yinghai Lu
2013-03-11 18:26 ` Vivek Goyal
2013-03-11 18:44 ` Yinghai Lu
2013-03-11 18:46 ` H. Peter Anvin
2013-03-11 18:50 ` Yinghai Lu
2013-03-11 18:55 ` H. Peter Anvin
2013-03-11 19:06 ` Yinghai Lu
2013-03-11 19:06 ` H. Peter Anvin
2013-03-11 19:08 ` Yinghai Lu
2013-03-11 19:20 ` Vivek Goyal
2013-03-11 19:55 ` H. Peter Anvin
2013-03-11 20:12 ` Vivek Goyal
2013-03-11 20:19 ` H. Peter Anvin
2013-03-11 20:36 ` H. Peter Anvin
2013-03-11 20:38 ` Eric W. Biederman
2013-03-11 20:42 ` H. Peter Anvin
2013-03-11 21:10 ` Vivek Goyal
2013-03-11 21:13 ` H. Peter Anvin
2013-03-11 20:45 ` Vivek Goyal
2013-03-11 20:50 ` H. Peter Anvin
2013-03-11 21:03 ` Vivek Goyal
2013-03-11 21:06 ` H. Peter Anvin
2013-03-12 13:46 ` Vivek Goyal
2013-03-12 8:35 ` Ingo Molnar
2013-03-11 20:57 ` Yinghai Lu
2013-03-11 21:06 ` Vivek Goyal
2013-03-11 21:15 ` Yinghai Lu
2013-03-11 19:10 ` Vivek Goyal
2013-03-11 19:34 ` Yinghai Lu
2013-03-11 19:38 ` Vivek Goyal
2013-03-11 19:39 ` Yinghai Lu
2013-03-11 19:44 ` Vivek Goyal
2013-03-11 19:44 ` Yinghai Lu
2013-03-18 14:46 ` Vivek Goyal
2013-03-18 15:33 ` Vivek Goyal
2013-03-18 19:05 ` Yinghai Lu
2013-03-18 19:10 ` H. Peter Anvin
2013-03-18 20:00 ` Vivek Goyal
2013-03-18 21:14 ` H. Peter Anvin
2013-03-18 21:25 ` [PATCH v3] " Yinghai Lu
2013-03-18 22:52 ` H. Peter Anvin [this message]
2013-03-18 23:26 ` Yinghai Lu
2013-03-19 0:27 ` H. Peter Anvin
2013-03-19 1:04 ` [PATCH v4] " Yinghai Lu
2013-03-19 13:33 ` Vivek Goyal
2013-03-19 15:05 ` [PATCH v5] " Yinghai Lu
2013-03-20 13:08 ` Vivek Goyal
2013-03-20 15:53 ` Yinghai Lu
2013-03-20 16:03 ` Vivek Goyal
2013-03-20 16:21 ` Yinghai Lu
2013-03-20 16:31 ` Vivek Goyal
2013-03-20 19:22 ` [PATCH] kexec: use Crash kernel for Crash kernel low Yinghai Lu
2013-03-25 19:42 ` Vivek Goyal
2013-03-25 21:50 ` Yinghai Lu
2013-03-26 18:14 ` Vivek Goyal
2013-04-01 13:34 ` Vivek Goyal
2013-04-01 18:33 ` H. Peter Anvin
2013-04-01 19:26 ` Vivek Goyal
2013-04-01 20:47 ` H. Peter Anvin
2013-04-01 21:10 ` Yinghai Lu
2013-04-01 22:02 ` H. Peter Anvin
2013-04-01 22:17 ` Yinghai Lu
2013-04-01 22:20 ` H. Peter Anvin
2013-04-01 22:40 ` Yinghai Lu
2013-04-02 1:11 ` Yinghai Lu
2013-04-02 13:50 ` Vivek Goyal
2013-04-02 14:17 ` Vivek Goyal
2013-04-02 14:50 ` Yinghai Lu
2013-04-02 14:45 ` Yinghai Lu
2013-04-02 14:58 ` Vivek Goyal
2013-04-02 15:44 ` Yinghai Lu
2013-04-02 15:39 ` Vivek Goyal
2013-04-02 15:46 ` Yinghai Lu
2013-04-02 15:50 ` Vivek Goyal
2013-04-02 17:21 ` Yinghai Lu
2013-04-02 13:30 ` Vivek Goyal
2013-03-20 19:24 ` [PATCH] kdump, x86: Process multiple Crash kernel in /proc/iomem Yinghai Lu
2013-03-22 17:59 ` Vivek Goyal
2013-03-22 20:52 ` Yinghai Lu
2013-03-22 21:21 ` Vivek Goyal
2013-03-22 21:27 ` H. Peter Anvin
2013-03-22 21:35 ` Yinghai Lu
2013-03-22 21:32 ` Yinghai Lu
2013-03-11 19:14 ` [PATCH] x86, kdump: Set crashkernel_low automatically Eric W. Biederman
2013-03-11 19:22 ` Vivek Goyal
2013-03-11 19:59 ` H. Peter Anvin
2013-03-11 20:17 ` Vivek Goyal
2013-03-11 19:56 ` H. Peter Anvin
2013-03-11 19:02 ` Vivek Goyal
2013-03-11 19:04 ` H. Peter Anvin
2013-03-11 19:17 ` Vivek Goyal
2013-03-11 13:14 ` 3.9-rc1: crash kernel panic - not syncing: Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer Konrad Rzeszutek Wilk
2013-03-11 13:14 ` Konrad Rzeszutek Wilk
2013-03-08 7:52 ` Takao Indoh
2013-03-08 7:52 ` Takao Indoh
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