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>
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