Date: Tue, 31 May 2011 23:48:59 +0200 From: Pieter de Goeje <pieter@degoeje.nl> To: mdf@freebsd.org Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r221853 - in head/sys: dev/md dev/null sys vm Message-ID: <201105312348.59571.pieter@degoeje.nl> In-Reply-To: <BANLkTimJY65boMPhnnT344cmwRUJ0Z=dSQ@mail.gmail.com> References: <201105131848.p4DIm1j7079495@svn.freebsd.org> <201105282103.43370.pieter@degoeje.nl> <BANLkTimJY65boMPhnnT344cmwRUJ0Z=dSQ@mail.gmail.com>
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On Sunday 29 May 2011 05:01:57 mdf@freebsd.org wrote: > On Sat, May 28, 2011 at 12:03 PM, Pieter de Goeje <pieter@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
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