Date: Thu, 25 Sep 2008 16:59:52 +0100 From: Pete French <petefrench@ticketswitch.com> To: koitsu@FreeBSD.org Cc: freebsd-stable@freebsd.org, admin@kkip.pl Subject: Re: vm.kmem_size settings doesn't affect loader? Message-ID: <E1KitFw-0000XA-3B@dilbert.ticketswitch.com> In-Reply-To: <20080925154357.GA16220@icarus.home.lan>
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> The ARC uses kmem. "Should not use that much more memory" is a matter > of opinion; if an additional 64MB given to ARC causes kmem exhaustion Well, yes :-) Though I would think if I was runnign a system with 1.5 gig of kernel memory where an extra 64 meg was the differebce between life and death then I would be sailing too close to the wind for my liking anyway... > On the bright side, it's very easy to determine how much memory is being > dedicated to the ARC. sysctl kstat.zfs.misc will disclose this data > and I believe the following statistics are the ones you have to examine > for this issue: Now this is very useful stuff! I have compared mine to yours, and I am using more or less an extra 64 meg. which is kind what I expected. I also tried the script from the wiki page to estimate how much kernel memory I am using, and that hovers around the 300 meg mark. > Let's adhere to the K.I.S.S. concept, and not turn this thread into > a "tuning micro-management" thread. fair enough - I was just curious about the difference between 64 and 128 on the ARC cache, and now I have an answer, and more than enough info to do my own invetsigations as to what works for me. Thanks ;) -pete.
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