From: "H. Peter Anvin" <hpa@zytor.com>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>,
Yinghai Lu <yinghai@kernel.org>, Ingo Molnar <mingo@elte.hu>,
Thomas Gleixner <tglx@linutronix.de>,
Maxim Uvarov <muvarov@gmail.com>,
linux-kernel@vger.kernel.org, Neil Horman <nhorman@redhat.com>,
"Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: kdump broken on 2.6.37-rc4
Date: Thu, 16 Dec 2010 08:53:17 -0800 [thread overview]
Message-ID: <4D0A43FD.3070509@zytor.com> (raw)
In-Reply-To: <20101216162255.GE13870@redhat.com>
On 12/16/2010 08:22 AM, Vivek Goyal wrote:
>>
>> I think limiting kdump below 512 MiB on 32 bits may make sense; perhaps
>> even on 64 bits. It's pretty conservative, after all...
>>
>> Opinions?
>
> Actually it will be good to know why 512MB. I know in the past we have
> been talking of reserving memory in higher memory regions and Neil Horman
> had been trying to boot bzImage in 64 bit mode so that it can be run
> from higher addresses.
>
> So right now limiting it is easy but it is desirable to be able to run
> bzImage from as high a address as possible and knowing why to limit it
> to 512MB can help see if there is a way to get rid of that limitation.
>
> I probably would not worry about 32bit systems but for 64 bit, I
> cerntainly want to make it boot from higher addresses (if it is possible
> technically).
>
It's worth noting that there is almost always going to be a need for
*some* low memory.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2010-12-16 16:53 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-03 11:16 kdump broken on 2.6.37-rc4 Stanislaw Gruszka
2010-12-03 11:16 ` Stanislaw Gruszka
2010-12-03 15:46 ` Maxim Uvarov
2010-12-03 15:46 ` Maxim Uvarov
2010-12-03 17:11 ` Stanislaw Gruszka
2010-12-03 17:11 ` Stanislaw Gruszka
2010-12-03 17:54 ` Neil Horman
2010-12-03 17:54 ` Neil Horman
2010-12-07 10:50 ` Stanislaw Gruszka
2010-12-07 10:50 ` Stanislaw Gruszka
2010-12-07 19:24 ` Yinghai Lu
2010-12-07 19:24 ` Yinghai Lu
2010-12-08 14:19 ` Stanislaw Gruszka
2010-12-08 14:19 ` Stanislaw Gruszka
2010-12-09 7:16 ` Yinghai Lu
2010-12-09 7:16 ` Yinghai Lu
2010-12-09 12:41 ` Stanislaw Gruszka
2010-12-09 12:41 ` Stanislaw Gruszka
2010-12-09 20:09 ` Yinghai Lu
2010-12-09 20:09 ` Yinghai Lu
2010-12-13 10:08 ` Stanislaw Gruszka
2010-12-13 10:08 ` Stanislaw Gruszka
2010-12-13 18:20 ` Yinghai Lu
2010-12-13 19:47 ` H. Peter Anvin
2010-12-14 22:41 ` Vivek Goyal
2010-12-15 10:39 ` Stanislaw Gruszka
2010-12-15 22:41 ` Yinghai Lu
2010-12-16 4:29 ` Yinghai Lu
2010-12-16 10:00 ` Stanislaw Gruszka
2010-12-16 16:16 ` H. Peter Anvin
2010-12-16 16:22 ` Vivek Goyal
2010-12-16 16:53 ` H. Peter Anvin [this message]
2010-12-18 21:50 ` Yinghai Lu
2010-12-16 14:39 ` Vivek Goyal
2010-12-16 16:28 ` H. Peter Anvin
2010-12-16 17:28 ` Yinghai Lu
2010-12-16 19:58 ` H. Peter Anvin
2010-12-16 22:57 ` Yinghai Lu
2010-12-16 23:30 ` Yinghai Lu
2010-12-16 23:49 ` Yinghai Lu
2010-12-17 0:39 ` Yinghai Lu
2010-12-17 1:06 ` H. Peter Anvin
2010-12-17 1:21 ` H. Peter Anvin
2010-12-17 1:51 ` H. Peter Anvin
2010-12-17 3:05 ` Yinghai Lu
2010-12-17 3:07 ` Yinghai Lu
2010-12-17 3:19 ` [tip:x86/urgent] x86-32: Make sure we can map all of lowmem if we need to tip-bot for H. Peter Anvin
2010-12-17 14:33 ` Stanislaw Gruszka
2010-12-16 22:01 ` kdump broken on 2.6.37-rc4 Vivek Goyal
2010-12-16 22:58 ` Yinghai Lu
2010-12-17 16:15 ` Vivek Goyal
2010-12-17 1:15 ` H. Peter Anvin
2010-12-17 3:31 ` H. Peter Anvin
2010-12-17 3:58 ` Yinghai
2010-12-17 4:08 ` H. Peter Anvin
2010-12-17 4:46 ` Yinghai Lu
2010-12-17 5:16 ` H. Peter Anvin
2010-12-17 17:01 ` Vivek Goyal
2010-12-17 17:56 ` H. Peter Anvin
2010-12-17 18:02 ` Vivek Goyal
2010-12-17 18:21 ` Yinghai Lu
2010-12-17 18:35 ` Vivek Goyal
2010-12-17 19:39 ` H. Peter Anvin
2010-12-17 19:46 ` Yinghai Lu
2010-12-17 19:50 ` Vivek Goyal
2010-12-17 19:52 ` Yinghai Lu
2010-12-17 20:01 ` Vivek Goyal
2010-12-17 20:06 ` Yinghai Lu
2010-12-17 20:34 ` Vivek Goyal
2010-12-17 23:51 ` Vivek Goyal
2010-12-17 19:56 ` H. Peter Anvin
2010-12-17 20:11 ` Vivek Goyal
2010-12-17 20:59 ` H. Peter Anvin
2010-12-17 21:13 ` Vivek Goyal
2010-12-20 16:31 ` Stanislaw Gruszka
2010-12-18 4:34 ` [tip:x86/urgent] x86, kexec: Limit the crashkernel address appropriately tip-bot for H. Peter Anvin
2010-12-17 19:50 ` kdump broken on 2.6.37-rc4 H. Peter Anvin
2010-12-13 10:25 ` Américo Wang
2010-12-13 10:25 ` Américo Wang
2010-12-05 14:35 ` Maciej Rutecki
2010-12-05 14:35 ` Maciej Rutecki
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