Originally Posted by Tinkster
Hi welcome to LQ!
And yes, of course:
Why don't you post *your* answers to the questions that were posed then?
My configuration is ubuntu jaunty (9.04) on a Sony Vaio G11 (2GB, Intel core solo U1500; Intel 950 graphics chipset) dual booting to win XP. Trying to use a 500GB USB2.0 (NTFS filesystem) to store videos and largish backups.
On the thread in question, rkelsen had suggested a change to the scheduler:
### quoted - cut and paste (i'm new here) ###
Seeing this behaviour between hard disk partitions would indicate that the default scheduler may not be best for your needs. Your config files indicate that the CFQ scheduler is the default on both kernels.
I'll explain how to change it now, because I'm going to bed shortly...
The output of the command in the previous post should look something like this:
$ cat /sys/block/sda/queue/scheduler
noop anticipatory deadline [cfq]
In this case, the noop, anticipatory, deadline and cfq schedulers are available for sda, and the brackets indicate that the cfq scheduler is currently selected.
The way to change it would be: (again substituting sda for the USB device)
# echo anticipatory > /sys/block/sda/queue/scheduler
You need to run this as root for every block device you wish to change.
### end quoted ###
This appears to have fixed uncertains usb drive, but not his other drives.
NB: uncertain discovered that other devices/partitions - not just usb - were affected. I have found the same - having been clued to check that by the thread. My write speed copying a file to the boot filesys is 1.5MB/s - usb 1.1 speeds, and this is the native boot HDD, NOT a USB device.
rkelsens opening suggestion does not work for me. It worked for uncertains USB HDD, but not his other partitions when the question became moot - a kernel upgrade fixed the issues for him.
At this point the thread was closed (28 july 2009 - a month ago)
I have upgraded to 2.6.30-02063003-generic (intel graphics chipset issues - largely resolved)