Date: Thu, 22 Feb 2007 09:37:46 +0100 (CET) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-stable@FreeBSD.ORG, Alexander Shikoff <minotaur@crete.org.ua>, wangyi6854@sohu.com Subject: Re: Very slow umass in 6.2-RC2 Message-ID: <200702220837.l1M8bkMm019881@lurza.secnetix.de> In-Reply-To: <20070221153852.GA14376@crete.org.ua>
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Alexander Shikoff wrote: > Wang Yi wrote: > > Alexander Shikoff wrote: > > > I have Apacer Flash: > > > > > > umass0: vendor 0x1005 USB FLASH DRIVE, rev 2.00/1.00, addr 2 > > > da0 at umass-sim0 bus 0 target 0 lun 0 > > > da0: < USB FLASH DRIVE 34CH> Removable Direct Access SCSI-0 device > > > da0: 40.000MB/s transfers > > > da0: 3936MB (8060928 512 byte sectors: 255H 63S/T 501C) > > > > > > Writing to this device is very slooooow. > > > > > > Time taken to copy file of 1,4G is near 30 min. > > > > Did you try it under Windows? How time does it spend? > > You may laugh but I have no Windows-based boxes with USB 2.0... :) > Whatever it seems that this Apacer flash drive under Windows and USB 1.0 > is faster than under FreeBSD and USB 2.0... > > Soon I will have a possibility to compare Apacer 4GB with Transcend > flash. I'll report detailed results here. Are you sure that your USB device supports hi-speed? Being USB 2.0 has _no_ meaning at all. Some cheap USB sticks support only full-speed, even though they are compliant with USB 2.0. Please check the manual or data sheet of your device to verify that it really supports hi-speed (or check with a different OS such as Windows). You wrote that 1.4 GB take almost 30 minutes. That's roughly 7 Mbit/s, which sounds quite reasonable for a full-speed device (raw speed 12 Mbit/s). Best regards Oliver -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M. Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün- chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart Any opinions expressed in this message are personal to the author and may not necessarily reflect the opinions of secnetix GmbH & Co KG in any way. FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd "I made up the term 'object-oriented', and I can tell you I didn't have C++ in mind." -- Alan Kay, OOPSLA '97
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