svn commit: r205311 - releng/7.3/release/doc/en_US.ISO8859-1/relnotes

[John Baldwin]

On Friday 19 March 2010 5:20:06 am Hiroki Sato wrote:
> --- releng/7.3/release/doc/en_US.ISO8859-1/relnotes/article.sgml	Fri Mar 19 
05:40:47 2010	(r205310)
> +++ releng/7.3/release/doc/en_US.ISO8859-1/relnotes/article.sgml	Fri Mar 19 
09:20:06 2010	(r205311)

Just a couple of notes:


> @@ -151,13 +151,35 @@
>      <sect2 id="kernel">
>        <title>Kernel Changes</title>
>  
> +      <para>The &man.acpi.4; subsystem now supports parsing SRAT
> +	(System Resource Affinity Table used to describe affinity
> +	relationships between CPUs and memory.</para>

This is probably a bit of an overstatement.  We only support examining it via 
acpidump(8).  We do not support using it in the kernel to provide NUMA support 
(I have some WIP for this, but it's not even in HEAD yet).

> +      <para arch="amd64,i386">The &os; virtual memory
> +	subsystem now supports fully transparent use of
> +	<application>superpages</application> for application memory;
> +	application memory pages are dynamically promoted to or
> +	demoted from superpages without any modification to
> +	application code.  This change offers the benefit of large
> +	page sizes such as improved virtual memory efficiency and
> +	reduced TLB (translation lookaside buffer) misses without
> +	downsides like application changes and virtual memory
> +	inflexibility. This can be enabled by setting a loader tunable
> +	<varname>vm.pmap.pg_ps_enabled</varname> to
> +	<literal>1</literal> and is enabled by default on
> +	&arch.amd64;.</para>

Hmm, I thought superpages was actually present in 7.2 as well, the only change 
in 7.3 was to enable it by default (which was subsequently reverted).  Note 
that it is not enabled by default for 7.3, so that part should be updated, 
though this entire paragraph is perhaps not relevant for 7.3.

Also, I think this paragraph isn't quite right:

        <para>The &man.pci.4; subsystem now supports proxying of PCI
          Express MSI/MSI-X (Message Signaled Interrupt) requests and
          bus interrupt requests for child devices.  This allows child
          devices to use MSI/MSI-X interrupts.</para>

My guess is that this is actually describing changes made to the vgapci(4) 
driver so that child devices such as drm(4) can use MSI?  Also, MSI is not 
PCI-e specific, so I would just say 'PCI MSI/MSI-X (...) requests'.

-- 
John Baldwin