Re pantzer5's suggestion: Memory is not a big problem for ZFS, address space is. You may have to give the kernel more address space on 32-bit CPUs.
eeprom kernelbase=0x80000000 This will reduce the usable address space of user processes though. --- Would you please verify that I understand correctly. I am extrapolating here based on general knowledge: During a running user process, the process has the entire lower part of the address space below the kernel. The kernel is loaded at kernelbase, and has from there to the top (2**32-1) to use for its purposes. Evidently it is relocatable or position independent. The positioning of kernelbase really has nothing to do with how much physical RAM I have, since the user memory and perhaps some of the kernel memory is virtual (paged). So the fact that I have 768MB does enter into this decision directly (It does indirectly per Jeff's note implying that kernel structures need to be larger with larger RAM, makes sense, more to keep track of, more page tables). By default kernelbase is set at 3G, so presumably the kernel needs a minimum of 1G space. Every userland process gets the full virtual space from 0 to kernelbase-1. So unless I am going to run a process that needs more than 1G, there is no advantage in setting kernelbase to something larger than 1G, etc. Even if physical RAM is larger. If I am not going to run virtual machines, or edit enormous video or audio or image files in RAM, I really have no use for userland address space, and giving alot to the kernel can only help it to have things mapped rather than having to recreate create information (Although I don't have a good handle on the utility of address space without a storage mechanism like RAM or Disk behind it...must be something akin to a pagefault with pages mapped to a disk file so you don't have to walk the file hierarchy). Hence your suggestion to set kernelbase to 2G. But 1G is probably fine too (Although the incremental benefit may be negligible - I am going for the principle here). How am I doing? -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
