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Old 01-17-2009, 11:31 AM
Laurent
 
Default transfer rate to usb key issue

Hi everyone,

I've recently tried to use my usb flash drive to copy stuff on it. First, i discovered that letting usb-mount manage it, makes it dead slow (approx. 100KB/s). However, mounting it manually changed things, but not to what i expected: the transfer starts off okay (25MB/s) then suddenly pauses, more and more often, until the average transfer rates approaches 1MB/s, but barely progresses at all.


My kernel is 2.6.26, same thing happens with 2.6.28. My distro is debian lenny, all updates installed.

Anyone got the same issue?

Have a nice week end!
 
Old 01-17-2009, 09:52 PM
"Adrian Levi"
 
Default transfer rate to usb key issue

2009/1/17 Laurent <olol85@gmail.com>:
> Hi everyone,
>
> I've recently tried to use my usb flash drive to copy stuff on it. First, i
> discovered that letting usb-mount manage it, makes it dead slow (approx.
> 100KB/s). However, mounting it manually changed things, but not to what i
> expected: the transfer starts off okay (25MB/s) then suddenly pauses, more
> and more often, until the average transfer rates approaches 1MB/s, but
> barely progresses at all.
>
> My kernel is 2.6.26, same thing happens with 2.6.28. My distro is debian
> lenny, all updates installed.
>
> Anyone got the same issue?
>
> Have a nice week end!

I have seen a similar issue when transferring to micro SD cards,
transfer seems to plateau out at between 300-500kB/s. Especially
prevalent with large sustained transfers.

I assumed it was the flash cards because it didn't matter if I used
the laptops built in card reader or a usb trans-flash adapter, Now I'm
starting to think it's an inherent problem with flash memory
alltogether.

Adrian

--
24x7x365 != 24x7x52 Stupid or bad maths?
<erno> hm. I've lost a machine.. literally _lost_. it responds to
ping, it works completely, I just can't figure out where in my
apartment it is.


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