On 2015-12-21 09:32, Linus Torvalds wrote:
On Sun, Dec 20, 2015 at 5:50 PM, Artem S. Tashkinov wrote:
P.S. I know Linus doesn't condone PAE but I still find it more
preferrable
than running a mixed environment with almost zero benefit in regard to
performance and quite obvious performance regressions related to an
increased number of libraries being loaded (i686 + x86_64) and
slightly
bloated code which sometimes cannot fit in the CPU cache. Call me old
fashioned but I won't upgrade to x86_64 until most of the things that
I run
locally are available for x86_64 and that won't happen any time soon.
Don't upgrade *user* land. User land doesn't use the braindamage that
is PAE.
Just run a 64-bit kernel. Keep all your 32-bit userland apps and
libraries.
Trust me, that *will* be faster. PAE works really horribly badly,
because all your really important data structures like your inodes and
directory cache will all be in the low 1GB even if you have 16BG of
RAM.
Of course, I'd also like more people to run things that way just to
get more coverage of the whole "yes, we do all the compat stuff
correctly". So I have some other reasons to prefer people running
64-bit kernels with 32-bit user land. But PAE really is a disaster.
In the past I happily ran an x86_64 bit kernel together with 32bit
userland for quite some time but then I hit a wall: VirtualBox expects
its kernel modules to have the same bitness as the application itself so
I had to revert back to an i686 PAE setup. It's probably high time to
try qemu however last time I looked at it a few years ago it lacked
several crucial features I need from a VM.
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