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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: Tomcat dies suddenly
Date Thu, 04 Feb 2010 23:10:46 GMT
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Chuck,

On 2/4/2010 5:36 PM, Caldarale, Charles R wrote:
>> From: Christopher Schultz [mailto:chris@christopherschultz.net] 
>> Subject: Re: Tomcat dies suddenly
>> 
>> I'm not sure what "low memory" space you're talking about. I don't 
>> believe Linux segments memory in any particular way.
> 
> As I understand it, the first 4 GB is "low memory"; it's much easier
> to access than anything over 4 GB in 32-bit mode, and some structures
> must reside there.

I might buy this if:

1. 32-bit Linux didn't support 64GiB of system memory, which it does
2. Processes used direct-memory addressing, which they don't
3. All kernel structures must reside in <4GiB memory space (maybe true?)
4. The kernel was too stupid to move it's structures when necessary
5. Carl's server was using more than 3.7GiB total memory and dipping int
swap (which it isn't)
6. Carl was using 32-bit Linux, which he isn't :(

AFAIK, 64-bit Linux has a wide-open memory addressing scheme. Maybe it
considers everything under 17 billion GiB to be "low memory", now :)

- -chris
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