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List:       freebsd-hackers
Subject:    Re: larger kernel virtual address space
From:       David Schultz <dschultz () uclink ! Berkeley ! EDU>
Date:       2002-04-30 11:03:14
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Thus spake Rohit Grover <rohit@gojuryu.com>:
> I apologize for not checking the FAQs before asking the question.
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/advanced.html#CHANGE-KERNEL-ADDRESS-SPACE
> 
> How large can we make the KVA?

This was recently discussed in the thread ``FreeBSD 4.5-STABLE not
easily scalable to large servers ... ?'' on the stable and current
lists; you'll probably find the information you want in the archives.
The short answer is that KVA + UVA <= 4 GB on x86.  So you could raise
KVA to 3 GB, for instance, but then any given user process would only
be able to address 1 GB of virtual memory.

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