Date: Sun, 12 Apr 2009 22:41:18 +0200 From: Frederique Rijsdijk <frederique@isafeelin.org> To: yuri@rawbw.com Cc: freebsd-questions@freebsd.org Subject: Re: Why USB harddrive is so slow under FreeBSD? Message-ID: <49E251EE.3080301@isafeelin.org> In-Reply-To: <49E246EC.50702@rawbw.com> References: <49E246EC.50702@rawbw.com>
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Yuri wrote: > I have FreeBSD-71 running with USB controller: > uhci0: <VIA 83C572 USB controller> port 0xa800-0xa81f irq 21 at device > 16.0 on pci0 > > I connected to it Toshiba USB hard drive HDDR500E03X: > umass0: <Toshiba External USB HDD, class 0/0, rev 2.00/1.03, addr 2> on > uhub4 > da0: <Toshiba External USB HDD 1.03> Fixed Direct Access SCSI-4 device > > When I try to copy data with 'dd if=/dev/da0s1 of=/dev/null count=10000' > it only achieves has 0.65MB/s transfer speed. > I get around the same speeds if I do it that way. But if I add 'bs=1m', speeds go up to 27MB/sec.
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