Date: Thu, 3 Feb 2005 21:52:46 -0500 (EST) From: "Mike Jakubik" <mikej@rogers.com> To: "Nick Pavlica" <linicks@gmail.com> Cc: freebsd-performance@freebsd.org Subject: Re: My disk I/O testing methods for FreeBSD 5.3 ... Message-ID: <1170.172.16.0.199.1107485566.squirrel@172.16.0.199> In-Reply-To: <dc9ba0440502031548544723a1@mail.gmail.com> References: <dc9ba044050203143647cee0c2@mail.gmail.com> <20050203175519.K18864@mail.chesapeake.net> <dc9ba0440502031548544723a1@mail.gmail.com>
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Nick Pavlica said: > Jeff, > One of the tests where I saw a large difference was in DD. I did a > quick test on a server that was brought up to RELENG_5 via cvsup on > 2/2/05. > > The Test: > -bash-2.05b$ time dd bs=1024 if=/dev/zero of=tstfile count=1M > 1048576+0 records in > 1048576+0 records out > 1073741824 bytes transferred in 74.402757 secs (14431479 bytes/sec) > > real 1m14.498s > user 0m0.550s > sys 0m8.838s FYI. # time dd bs=1024 if=/dev/zero of=tstfile count=1M 1048576+0 records in 1048576+0 records out 1073741824 bytes transferred in 22.150709 secs (48474377 bytes/sec) real 0m22.173s user 0m0.501s sys 0m13.832s This is on an old ATA disk. FreeBSD 6.0-CURRENT #0: Wed Jan 19 21:11:16 EST 2005. CPU: AMD Athlon(tm) Processor (1410.21-MHz 686-class CPU) real memory = 536788992 (511 MB) acpi0: <ASUS A7V-133> on motherboard ad0: 78167MB <Maxtor 6Y080P0/YAR41BW0> [158816/16/63] at ata0-master UDMA100
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