Re: [gentoo-user] USB mass storage device slow in Gentoo, fast in Windows...?

[Paul Hartman]

On Sun, Dec 27, 2009 at 12:01 AM, Michael Holmes
<holmesmich@××××××××××.com> wrote:
> 2009/12/27 Paul Hartman <paul.hartman+gentoo@×××××.com>:
>> On Sat, Dec 26, 2009 at 7:00 PM, Hung Dang <hungptit@×××××.com> wrote:
>>> On 12/26/09 15:54, Paul Hartman wrote:
>>>> Hi,
>>>>
>>>> I got a Nokia N900 linux internet tablet/phone a few days ago, and
>>>> when I connect it in USB Mass Storage mode to a Windows Vista computer
>>>> I can write at 17MB/sec, but when I connect it to my Gentoo box my
>>>> writes are really slow, between 500-900kb/sec depending on if I mount
>>>> in "sync" mode or not. As far as I know it should be just a totally
>>>> standard/generic mass storage device. (there were no drivers or
>>>> software install needed in windows, it just worked)
>>>>
>>>> Other USB devices plugged into the same port go full speed, and AFAIK
>>>> everything appears as if it should be high speed USB 2.0. Has anyone
>>>> seen something like this before? I'm not sure what the deal is. It
>>>> takes 20 minutes to copy 1 gigabyte from Linux and takes just under 1
>>>> minute to do the same in Windows.
>>>>
>>>> I'm not sure about debugging USB or what the options are. Everything
>>>> I've used previously has worked without any hassle.
>>> Have you received a lot of debugging messages at the output of dmesg
>>> when copying files?
>>>
>>> Hung
>>
>> No errors, no strange messages at all, it seems normal (only slow). I
>> have other USB devices like SD card reader, external HDD, and they
>> perform at full speed when plugged into the same port, so it's weird
>> to me.
>>
>> Thanks
>> Paul
>>
>>
>
> This isn't that helpful, but in Windows I get good thoroughputs in
> mass storage mode, but compartively weak ones in sync mode. But this
> shouldn't be the problem because as far as I know, there are no
> ync-mode drivers for good old Linux (which is ironic if you consider
> it).

When I said "sync" mode I mean mounting the device in mass storage
mode with with "-o sync" (as opposed to the default cached/async
mode), which I believe is the default in Windows Vista & Win7 (because
most windows users cannot be bothered to unmount before pulling the
plug).

Thanks