Re: [tlug] USB2 external HDD

["emiddleton@example.com" <emiddleton@example.com>]

Darren Cook wrote:
>> I tend to find the caching is excessive under 2.6 kernel with USB
>> mass-storage devices.
>>     
>
> Yes, I've found this too. I wonder if the problems I see could be due to
> a buffer filling up, rather than it switching to USB 1? But that doesn't
> seem to fit the other evidence (e.g. breaking the copy up into less than
> 1G portions and doing a umount (i.e. flush) between each is much quicker
> overall).
>   

Check what dmesg says, I would expect it to report if changing from usb2
to ubs1.  If it starts using swap as cache then you are going to see
serious churn.  I will have to check next time I copy something big to a
usb memory stick.

Edward