Date: Tue, 10 Apr 2001 19:44:17 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: Rik van Riel <riel@conectiva.com.br> Cc: David Xu <bsddiy@21cn.com>, freebsd-hackers@FreeBSD.ORG Subject: Re: vm balance Message-ID: <200104110244.f3B2iHk97869@earth.backplane.com> References: <Pine.LNX.4.21.0104102231300.25737-100000@imladris.rielhome.conectiva>
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It's randomness that will kill performance. You know the old saying about caches: They only work if you get cache hits, otherwise they only slow things down. -Matt :Which is ok if there isn't too much activity with these data :structures, but I'm not sure if it works when you have a lot :of metadata activity (though I'm not sure in what kind of :workload you'd see this). : :Also, if you have a lot of metadata activity, you'll essentially :double the memory requirements, since you'll have the stuff cached :in both the internal structures and in the VM PAGE cache. I'm not :sure how much of a hit this would be, though, if the internal :structures are limited to a small enough size... : :regards, : :Rik To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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