This is a discussion on Re: FreeBSD cache memory allocation - FreeBSD ; On Wednesday 14 November 2007 04:02:05 pm icantthinkofone wrote: > On Wednesday 14 November 2007 11:11:41 am Rob Belics wrote: > > > Someone I can't stand said this about FreeBSD. Though I know C, I > don't > > ...
On Wednesday 14 November 2007 04:02:05 pm icantthinkofone wrote:
> On Wednesday 14 November 2007 11:11:41 am Rob Belics wrote:
> > > Someone I can't stand said this about FreeBSD. Though I know C, I
> > > know anything about this and would love to respond. My first
> thought was
> > > 'contigmalloc' but I'm not sure it's equivalent.
> > >The kernel is really lacking some features. They need a> method to
> > > set precise type of memory cache but BSD doesn't provide way to
> > > memory cache.
> > >
> > > For that reason MS has the beautiful
> > > MmAllocateContigousMemorySpecifyCache()
> For kernel memory on i386 and amd64 in 6.3 and later you can use
> pmap_change_attr() to adjust the caching mode of memory after you have
> allocated it. It is best used only with allocations that are a
> multiple of
> the page size.
> -- John Baldwin
> I posted using the wrong email address above.
> Apparently the person I was referring to was probably talking about he
> nvidia issue and I see you, John, are working on that pmap function.
> One question I have is whether nvidia got themselves into a bind (for
> lack of a better word) because they wrote their drive using Windows
> functions but now want FreeBSD to create kernel functions "just like
> Windows" rather than rewriting their own code. Or is all this truly a
> lacking feature in FreeBSD?
It's a lacking feature in FreeBSD.
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