Date: Sat, 9 Mar 1996 18:12:18 +1100 (EDT) From: Darren Reed <avalon@coombs.anu.edu.au> To: StevenR362@aol.com Cc: luigi@labinfo.iet.unipi.it, hackers@FreeBSD.org Subject: Re: IDE performance Message-ID: <199603090711.XAA28801@freefall.freebsd.org> In-Reply-To: <960309000518_345746242@emout09.mail.aol.com> from "StevenR362@aol.com" at Mar 9, 96 00:05:19 am
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Hmm, I don't know how useful iozone is for testing raw disk io, but with dd, I can get a reasonable indication: # time dd if=/dev/rwd0s1 of=/dev/null bs=1024k count=32 32+0 records in 32+0 records out 33554432 bytes transferred in 10 secs (3355443 bytes/sec) 0.000u 0.142s 0:09.64 1.4% 83+2426k 0+0io 0pf+0w # time dd if=/dev/rwd2s1 of=/dev/null bs=1024k count=32 32+0 records in 32+0 records out 33554432 bytes transferred in 5 secs (6710886 bytes/sec) 0.006u 0.122s 0:05.35 2.2% 139+3784k 0+0io 0pf+0w # dd if=/dev/rwcd0c of=/dev/null bs=1024k count=32 32+0 records in 32+0 records out 33554432 bytes transferred in 55 secs (610080 bytes/sec) wdc0 at 0x1f0-0x1f7 irq 14 flags 0x80ff80ff on isa wdc0: unit 0 (wd0): <WDC AC2850F>, 32-bit, multi-block-16 wd0: 814MB (1667232 sectors), 1654 cyls, 16 heads, 63 S/T, 512 B/S wdc0: unit 1 (atapi): <MATSHITA CR-581/1.07>, removable, accel, iordis wcd0: 689Kb/sec, 128Kb cache, audio play, 256 volume levels, ejectable tray wcd0: medium type unknown, unlocked wdc1 at 0x170-0x177 irq 15 flags 0x80ff80ff on isa wdc1: unit 0 (wd2): <WDC AC31600H>, 32-bit, multi-block-16 wd2: 1549MB (3173184 sectors), 3148 cyls, 16 heads, 63 S/T, 512 B/S I wonder, can the CD-ROM's presence slow down the entire bus ? darren
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