See also the FAQ entry.
IRC, freenode, #hurd, 2012-09-30
<braunr> i expect smp to be our next gsoc project
IRC, freenode, #hurd, 2013-01-02
<braunr> i'd like to mentor someone for adding smp to gnumach
IRC, freenode, #hurd, 2013-03-14
<braunr> but i'm afraid we'll have to fight obscur smp-safety issues
<braunr> for one, drivers are much probably not smp safe and would require
a big kernel lock
<braunr> userspace (such as signal delivery in libc) might be affected too
<braunr> smp isn't that easy
Richard, 2013-03-20
This task actually looks too big for a GSoC project.
IRC, freenode, #hurd, 2013-09-30
<braunr> also, while the problem with hurd is about I/O, it's actually a
lot more about caching, and even with more data cached in, the true
problem is contention, in which case having several processors would
actually slow things down even more