Date: Tue, 08 Oct 2002 15:34:00 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Nate Lawson <nate@root.org> Cc: "Vladimir B. Grebenschikov" <vova@sw.ru>, arch@FreeBSD.org Subject: Re: using mem above 4Gb was: swapon some regular file Message-ID: <3DA35D58.B1B5D78D@mindspring.com> References: <Pine.BSF.4.21.0210081209010.11243-100000@root.org>
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Nate Lawson wrote: > On 8 Oct 2002, Vladimir B. Grebenschikov wrote: > > Exactly, Terry is right about large number of relative-small > > network-access processes (say apaches). But there are some other cases, > > say you have some DB server with huge index, say 10Gb, I think keep > > index in RAM effective than on disk. > > It's often surprisingly effective to just access the index on disk and > tune your VM cache instead. You can lose performance by double-caching > data. PSE-36 and PAE give you access to a 36 bit address space. But you are still limited to a 32 bit *linear* address space. More RAM in a 32 bit machine, even if you can wave the appropriate entrails over the keyboard so that it's accessible to the OS, will *NOT* increase the linear address space. IMO, if you want a larger linear address space, instead of pretending you have one, buy yourself an IA64 instead. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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