Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings

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To: H. Peter Anvin <hpa@...>

Cc: Andi Kleen <ak@...>, Jeremy Fitzhardinge <jeremy@...>, Andrew Morton <akpm@...>, <virtualization@...>, lkml <linux-kernel@...>, Zachary Amsden <zach@...>, Chris Wright <chrisw@...>, Eric W. Biederman <ebiederm@...>, Linus Torvalds <torvalds@...>

Subject: Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings

Date: Thursday, April 19, 2007 - 5:22 pm

H. Peter Anvin wrote:
quoted text> Andi Kleen wrote:
>> On Thursday 19 April 2007 22:55:50 H. Peter Anvin wrote:
>>> Andi Kleen wrote:
>>>>> Is some version of this going in for 2.6.21, or is it not a real
>>>>> problem?
>>>> When it's only seen with Xen it's not a real problem right now.
>>> It's not just seen only with Xen, though.  It will affect all kernels
>>> in a particular range of sizes, and we have ordinary kernels covering
>>> that range (in fact, Xen hardly affects size in that way.)
>>
>> Then we would have seen reports surely?
> 
> The critical size window is relatively small, though.  The size of the
> uncompressed kernel mod 4 MB must be above 3.75 MB or so.  If you have
> less than 1 GB RAM, the window is even smaller.  This is strictly
> configuration-dependent, and has nothing to do with Xen.  It just so
> happened that the first people to detect and diagnose it (as opposed to
> just "it doesn't boot") were Xen people.

I never saw a description of the symptoms of encountering this bug.
Does it just hang, or what?

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Messages in current thread:

[PATCH 10/28] i386: map enough initial memory to create lowm..., Jeremy Fitzhardinge, (Sat Apr 14, 4:42 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Chuck Ebbert, (Thu Apr 19, 4:47 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Andi Kleen, (Thu Apr 19, 4:50 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Thu Apr 19, 4:55 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Andi Kleen, (Thu Apr 19, 5:04 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Thu Apr 19, 5:11 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Chuck Ebbert, (Thu Apr 19, 5:22 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Thu Apr 19, 5:35 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Mon Apr 23, 5:12 am)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Mon Apr 23, 12:34 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Mon Apr 23, 12:42 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Mon Apr 23, 1:21 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Mon Apr 23, 2:06 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Mon Apr 23, 2:54 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Mon Apr 23, 3:10 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Mon Apr 23, 3:14 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Mon Apr 23, 3:21 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Mon Apr 23, 3:39 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Mon Apr 23, 4:41 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Mon Apr 23, 1:02 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Mon Apr 23, 1:31 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Mon Apr 23, 1:45 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Mon Apr 23, 1:52 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Andi Kleen, (Mon Apr 23, 1:54 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Mon Apr 23, 1:22 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Mon Apr 23, 2:00 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Mon Apr 23, 12:01 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Wed Apr 25, 4:54 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Wed Apr 25, 5:31 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Wed Apr 25, 6:00 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Wed Apr 25, 6:06 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Sun Apr 29, 12:44 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Sun Apr 29, 12:55 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Wed Apr 25, 6:18 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Wed Apr 25, 6:52 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Wed Apr 25, 7:33 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Wed Apr 25, 7:41 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Chris Wright, (Wed Apr 25, 8:33 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Wed Apr 25, 8:55 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Sat Apr 14, 6:04 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jan Engelhardt, (Sun Apr 15, 5:46 am)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Andreas Schwab, (Sun Apr 15, 6:17 am)

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