On Sat, 2012-11-10 at 20:14 -0200, Henrique de Moraes Holschuh wrote: > On Sat, 10 Nov 2012, Bastian Blank wrote: > > On Sat, Nov 10, 2012 at 02:15:14PM -0200, Henrique de Moraes Holschuh wrote: > > > Yes, I know :) Our amavisd-box at work has 16GiB RAM and 16 cores, > > > we need at least that much to be able to run 64 instances with the > > > scratch directories on tmpfs... > > > x32 would be most likely a _MAJOR_ win for that box. > > > > Is it _likely_ or is it? 16GiB can be used with the 32bit i386 also. > > I assume you mean a amd64-kernel with i386 userspace combination. > > Compared to x32, i*86 userspace on a 64-bit kernel has the added aggravation > of the full kernel syscall compat layer, which has been a source of problems > in the past, and all the wasted performance of our i486-optimized userland. [...]
The compat layer for x32 is almost entirely the same as for i386 on x86_64; indeed it is almost entirely the same as Linux uses for *every* 64-bit architecture that supports a 32-bit userland. I think the only interesting difference is that x32 has 64-bit time_t. Ben. -- Ben Hutchings The program is absolutely right; therefore, the computer must be wrong.
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