[Bug 541937] Re: Copying files to USB flash drive is extremely slow

[QuentinHartman]

I installed the kernel linux-image-2.6.36-020636-generic from the
mainline-ppa and it created a marginal improvement. Speed still was
initially quite high, but then it decreased continually until it reached
into the 1-2MB range where I aborted the transfer. The difference
between the behavior with 2.6.35-22-generic and the newer kernel was
that the speed drop was slower. I was able to copy about 1GB of data in
a reasonable time, whereas with the older kernel things slowed
substantially after only copying about 300MB. This performance drop
seems to happen regardless of the method used to copy the data. I've
tried copies via nautilus, cp, and rsync. Even the process of creating
an ext3 partition on the device seems to slow as it progresses.

Unibody Macbook Pro w/ 2.53Ghz processor
4GB RAM

USB drive is a 32GB OCZ Rally2 that is identified by lsusb as "Bus 002
Device 005: ID 1307:0165 Transcend Information, Inc. 2GB/4GB Flash
Drive". I am plugging it directly into the USB port of the computer.

Complete lsusb output:

Bus 004 Device 003: ID 05ac:8217 Apple, Inc. Bluetooth USB Host Controller
Bus 004 Device 002: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth)
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 003: ID 05ac:0236 Apple, Inc. Internal Keyboard/Trackpad (ANSI)
Bus 003 Device 002: ID 05ac:8242 Apple, Inc. IR Receiver [built-in]
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 005: ID 1307:0165 Transcend Information, Inc. 2GB/4GB Flash Drive
Bus 002 Device 003: ID 05ac:8403 Apple, Inc. 
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 009: ID 045e:071d Microsoft Corp. 
Bus 001 Device 008: ID 0424:2228 Standard Microsystems Corp. 9-in-2 Card Reader
Bus 001 Device 007: ID 0424:2602 Standard Microsystems Corp. USB 2.0 Hub
Bus 001 Device 006: ID 0424:2512 Standard Microsystems Corp. USB 2.0 Hub
Bus 001 Device 003: ID 05ac:8507 Apple, Inc. 
Bus 001 Device 002: ID 0409:005a NEC Corp. HighSpeed Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I would really like to help get this problem fixed and am willing to
provide any assistance I can.

-- 
Copying files to USB flash drive is extremely slow
https://bugs.launchpad.net/bugs/541937
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