Date: Thu, 28 Sep 1995 10:38:08 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: jgreco@brasil.moneng.mei.com (Joe Greco) Cc: taob@io.org, hackers@FreeBSD.ORG Subject: Re: News Server VM & I/O issues (was: Re: Big win for BSD/OS compatibility) Message-ID: <199509281738.KAA12846@phaeton.artisoft.com> In-Reply-To: <199509280600.BAA05493@brasil.moneng.mei.com> from "Joe Greco" at Sep 28, 95 01:00:39 am
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> Rod made an interesting suggestion: > > > Start chasing around in the UFS code and see if you can some how create > > seperate priorities of importanace for meta data vs file block data in > > the VM cache, in your application tossing out meta data is VERY expensive. > > A few quick emails to John Dyson or David Greenman might point you to > > some tuneable parameters in the system that would help you out. This is actually bogus; it violates the locality rules that cause a cache to function in the first place. One soloution would be to make writes be ordered but not synchronus. The synchronus metadata updates are a poor mechanism for guaranteeing the order is (1) metadata and (2) data. Unfortunately, this approach is currently patent-pending by USL, although I believe there is sufficient prior art that it isn't really patentable, that usually has little bearing on whether or not a patent is granted. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
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