Date: Tue, 27 Nov 2001 11:14:43 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Sheldon Hearn <sheldonh@starjuice.net> Cc: David Greenman <dg@root.com>, Kirk McKusick <mckusick@beastie.mckusick.com>, freebsd-arch@FreeBSD.ORG Subject: Re: Using a larger block size on large filesystems Message-ID: <200111271914.fARJEhn93832@apollo.backplane.com> References: <82580.1006875548@axl.seasidesoftware.co.za>
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:I'm almost finished with my batch of postmark benchmarks and will try :your program next. : :Postmark seems to reflect MTA-like access patterns very accurately. :Postmark shows my Mylex eXtremeRAID + 15Krpm storage as about 3 times :faster than my Compaq SmartArray + 10Krpm storage, and Exim shows a :corresponding performance increase approaching a factor of 3. : :Can we rely on your program to be similarly reflective of a RDBMS-like :access patterns? : :Ciao, :Sheldon. It should be reflective of the absolute worst case type of database access - a random seek/read. This is quite typical of what databases handling large numbers of independant transactions (think VISA) have to deal with. It is not reflective of a general purpose RDBMS, since those rely heavily on caching (and would look more like an MTA access pattern). -Matt Matthew Dillon <dillon@backplane.com> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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