Date: Wed, 4 Mar 2009 15:33:11 -0700 From: "Kenneth D. Merry" <ken@kdm.org> To: Rusu Silviu <bsdgroup.md@gmail.com> Cc: freebsd-hardware@freebsd.org Subject: Re: Extremely slow read/write speed, 7.1 Release on Intel ICH9 SATA Message-ID: <20090304223310.GA35737@nargothrond.kdm.org> In-Reply-To: <ee705d4a0902260857g6cffb3a0t13d3b2afb11ffdb6@mail.gmail.com> References: <ee705d4a0902260857g6cffb3a0t13d3b2afb11ffdb6@mail.gmail.com>
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On Thu, Feb 26, 2009 at 18:57:48 +0200, Rusu Silviu wrote: > Extremely slow read/write speed, 7.1 Release on Intel ICH9 SATA > > Should i send this to freebsd-fs list? > > Have 3 HDDs > - 160G Seagate Serial ATA v1.0, 3 partitions: 1 - system, 2 - data, 3 - > storage, soft updates on for all partitions > - 750G Samsung Serial ATA II, 1 partition, soft updates on > - 1000G Samsung Serial ATA II, 1 partition, soft updates on > > hw.ata.wc=1 > > Mobo is an ASUS P5KR, P35/ICH9 > Buyed it cause `man ata' says ICH9 is supported > There are also Jmicron eSATA/PATA controller, that i actually disabled > No overclocking > > dd if=/dev/ad4 of=/dev/null > iostat -w1 ad4 > tty ad4 cpu > tin tout KB/t tps MB/s us ni sy in id > 47 48 1.65 252 0.40 6 0 1 1 92 > 1 251 0.50 12650 6.18 2 0 15 14 69 > 0 88 0.50 12583 6.15 3 0 18 12 67 > 0 87 0.50 12641 6.17 3 0 18 12 68 [ ... ] You should specify a blocksize with dd. By default, it uses 512 byte blocks, which will result in very slow transfer speeds. Try this instead: dd if=/dev/ad4 of=/dev/null bs=1m Ken -- Kenneth Merry ken@kdm.org
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