Brian Hechinger wrote: > On Mon, Jun 23, 2008 at 03:16:45PM -0400, Brian H. Nelson wrote: > >>> Limits on physical memory for 32-bit platforms also depend on the >>> Physical Address Extension >>> <http://msdn.microsoft.com/en-us/library/aa366796%28VS.85%29.aspx> >>> (PAE), which allows 32-bit Windows systems to use more than 4 GB of >>> physical memory. >>> >>> PAE is enabled by default on XP after SP1, and all builds of vista. >>> >> Read the regular-sized print in the XP and Vista tables: >> >> Under Windows, the 4GB limit is a LICENSING limit, not a problem of >> addressability, PAE or otherwise. The 4GB limit is also in place for >> 32-bit Windows Server Standard editions. If you want to be able to use >> more memory, you need to pay more money (as Charles already stated). >> > > Regardless of licensing issues, PAE is an ugly hack and shouldn't be used > it at all possible. ;) > > -brian > But, but, but, PAE works sooooo nice on my Solaris 8 x86 boxes for massive /tmp. :-)
To be even more pedantic about XP, here's the FINAL word from microsoft about the PAE and 2+ GB RAM support: http://msdn.microsoft.com/en-us/library/ms791485.aspx http://www.microsoft.com/whdc/system/platform/server/PAE/PAEmem.mspx Bottom line: Windows XP (any SP) supports a MAXIMUM of 4GB of ram, regardless of the various switches. This is a CODE limit, not a license limit. While there are a bunch of APIs which are nominally available under XP for use of 4+GB address spaces, the OS kernel itself it limited to 4GB of physical RAM. Back on topic: the one thing I haven't tried out is ZFS on a 32-bit-only system with PAE, and more than 4GB of RAM. Anyone? -- Erik Trimble Java System Support Mailstop: usca22-123 Phone: x17195 Santa Clara, CA Timezone: US/Pacific (GMT-0800) _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
