Messages in this thread | | | Date | Tue, 15 Jan 2002 16:05:39 -0500 | From | Brian Gerst <> | Subject | Re: 3.5G user space speed |
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Peter Zaitsev wrote: > > Hello Linux, > > 2.4.xaa Series as well as SuSE kernels have 3.5G userspace option, > which seems to be quite useful, therefore I see it's not included > is stock kernel for some reasons. Also I've heard this > configuration may have some performance problems. > > Can anyone comment on this topic ? > > I need large amount of address space for my application but I also > need to get as much I/O performance as it's possible, so I can switch > to 3.0/1.0 memory distribution if it will benefit here.
You can't have it both ways with the x86 (speed vs. large userspace). Kernel 2.5 may help a bit here because changes were made to allow DMA from all memory (subject to card limitations), lessening the burden for direct-mapped memory. Otherwise you'll need to move to a 64-bit arch.
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