svn commit: r221853 - in head/sys: dev/md dev/null sys vm

[Pieter de Goeje]

On Sunday 29 May 2011 05:01:57 mdf at freebsd.org wrote:
> On Sat, May 28, 2011 at 12:03 PM, Pieter de Goeje <pieter at degoeje.nl> wrote:
> > To me it looks like it's not able to cache the zeroes anymore. Is this
> > intentional? I tried to change ZERO_REGION_SIZE back to 64K but that
> > didn't help.
>
> Hmm.  I don't have access to my FreeBSD box over the weekend, but I'll
> run this on my box when I get back to work.
>
> Meanwhile you could try setting ZERO_REGION_SIZE to PAGE_SIZE and I
> think that will restore things to the original performance.

Indeed it does. I couldn't find any authoritative docs stating wether or not 
the cache on this CPU is virtually indexed, but apparently at least some of 
it is.

Regards,

Pieter