Date: Sun, 1 Mar 2009 02:05:36 +0200 From: Artyom Mirgorodsky <man@email.com.ua> To: Hans Petter Selasky <hselasky@c2i.net> Cc: freebsd-usb@freebsd.org Subject: Re: Low perfomance when read from usb flash drive Message-ID: <200903010205.37192.man@email.com.ua> In-Reply-To: <200903010038.29534.hselasky@c2i.net> References: <200903010045.44904.man@email.com.ua> <200903010038.29534.hselasky@c2i.net>
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>Hi please explain what kind of test you have done. It's most likely not >related to USB, but rather the file system. > Maybe you can run the following test on Windows and FreeBSD to compare: > > dd if=/dev/da0 of=/dev/null bs=65536 I'm test on FreeBSD7-stable and FreeBSD-current and post results. Flash drive, FS, computer the same. Windows only for example. PS dd makes the same result - problem not in the file system dd if=/dev/da0 of=/dev/null bs=65536 7281+0 records in 7281+0 records out 477167616 bytes transferred in 36.602952 secs (13036315 bytes/sec) systat -vm Disks ad4 ad6 da0 cd0 pass0 sg0 sg1 151844 wire KB/t 27.33 0.00 64.00 0.00 0.00 0.00 0.00 198628 act tps 9 0 200 0 0 0 0 758680 inact MB/s 0.25 0.00 12.50 0.00 0.00 0.00 0.00 1660 cache %busy 0 0 99 0 0 0 0 288948 free -- С уважением, Артём Миргородский tel: (056) 373 42 84 Jabber Id: artyom.mirgorodsky@gmail.com mailto: man@alkar.net
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