The fragility of your argument

By: nick (no.delete@this.mail.com), May 13, 2007 5:42 pm
Room: Moderated Discussions
slacker (sla@c.ker) on 5/13/07 wrote:
---------------------------
>Linus Torvalds (torvalds@osdl.org) on 5/13/07 wrote:
>---------------------------
>>The biggest single reason to go 64-bit is exactly
>>because of physical address space. Your virtual address
>>space needs to bea multiple of the physical one:
>>when you hit 1GB of RAM, 32-bit virtual memory is no longer
>>acceptable. You literally do need more virtual memory than
>>physical.
>
>Your virtual address space needs to be a multiple of the maximum resident set
>size
of your applications. If you have a single application which is working
>with 1GB of physical memory, then you will need > 1GB (and likely > 4GB) of virtual memory.

Yhe kernel caches data as well, which was one of the points
(eg. about various kernel caches not being able to take
advantage of the physical memory without jumping through so
many hoops it isn't worthwhile).

PAE works "OK" if you include the kernel working set size
in that set. However clearly the best thing to do is avoid
all the ifs, buts, and maybes, and use a 64-bit virtual
address space for the kernel.

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                                Does it really matter?Doug Siebert05/10/07 09:10 AM
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                                    let's stay with x86-64 for now, pleaseDean Kent05/11/07 06:11 AM
                                      let's stay with x86-64 for now, pleaserwessel05/11/07 02:46 PM
                                        let's stay with x86-64 for now, pleaseDean Kent05/11/07 06:03 PM
                                          let's stay with x86-64 for now, pleaseMichael S05/12/07 10:49 AM
                                            let's stay with x86-64 for now, pleaseDean Kent05/12/07 01:05 PM
                                              let's stay with x86-64 for now, pleaseMichael S05/12/07 01:25 PM
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                                        What's your point?Linus Torvalds05/11/07 04:15 PM
                                          What's your point?Doug Siebert05/13/07 03:11 PM
                                            What's your point?Dean Kent05/13/07 07:04 PM
                                              What's your point?JasonB05/14/07 02:06 AM
                                                What's your point?Dean Kent05/14/07 07:20 AM
                                                  What's your point?JasonB05/14/07 04:35 PM
                                                  What's your point?JasonB05/14/07 07:35 PM
                                                    What's your point?Dean Kent05/14/07 08:12 PM
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                                        What's your point?Stephen H05/13/07 01:55 AM
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                                            PAE sucks (Why didn't MS take advantage of PAE?)Linus Torvalds05/13/07 10:20 AM
                                              PAE sucks (Why didn't MS take advantage of PAE?)Dean Kent05/13/07 10:49 AM
                                              PAE sucks (Why didn't MS take advantage of PAE?)David W. Hess05/13/07 12:37 PM
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                                              The fragility of your argumentslacker05/13/07 03:56 PM
                                                The fragility of your argumentnick05/13/07 05:42 PM
                                                The fragility of your argumentHoward Chu05/14/07 02:52 AM
                                                  The fragility of your argumentDean Kent05/14/07 09:19 AM
                                                The fragility of your argumentanon205/14/07 08:26 AM
                                                  The fragility of your argumentTzvetan Mikov05/14/07 09:01 AM
                                                  The fragility of your argumentDean Kent05/14/07 09:16 AM
                                                    The fragility of your argumentLinus Torvalds05/14/07 11:57 AM
                                                      The fragility of your argumentJasonB05/14/07 04:48 PM
                                                        The fragility of your argumentDean Kent05/14/07 07:36 PM
                                                          The fragility of your argumentRicardo B05/16/07 02:40 AM
                                                            The fragility of your argumentDean Kent05/16/07 03:32 AM
                                                              The fragility of your argumentRicardo B05/16/07 06:41 AM
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                                                                      Aha!Dean Kent05/16/07 09:32 AM
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                                                                  The fragility of your argumentRicardo B05/16/07 10:00 AM
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                                                        The fragility of your argumentPaul05/16/07 03:01 PM
                                                          The fragility of your argumentVincent Diepeveen05/17/07 03:05 AM
                                                    The fragility of your argumentanon205/15/07 01:35 AM
                                                    Splits vs page allocations?Matt Sayler05/15/07 07:33 AM
                                          What's your point?Michael S05/13/07 08:55 AM
                                            What's your point?anonymous05/13/07 11:08 AM
                                              What's your point?Michael S05/13/07 11:31 AM
                                      let's stay with x86-64 for now, pleaseJasonB05/13/07 07:16 AM
                                x864 =) (NT)some105/15/07 03:03 AM
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  Rock/Tukwila rumorsmas05/15/07 09:40 AM
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