Ubuntu
linux package

  1. Bug #620074
  2. Comment #631

Comment 631 for bug 620074

Revision history for this message
In , leho (leho-linux-kernel-bugs) wrote :

(In reply to comment #568)
> (In reply to comment #567)
> > Maybe this:
> > http://lwn.net/Articles/467328/
>

Whatever this patch has done or not done, I just had my 3.4.11-pf laptop (CFQ, BFQ) load climb from regular 0,6 to 30+ when I did:

$ ls -l usb-_USB_FLASH_DRIVE_079605074ECA-0\:0.img
-rw-r--r-- 1 leho leho 2004877312 6. nov 12:41 usb-_USB_FLASH_DRIVE_079605074ECA-0:0.img

$ ddrescue usb-_USB_FLASH_DRIVE_079605074ECA-0\:0.img /dev/sdb --force
GNU ddrescue 1.16
Press Ctrl-C to interrupt
rescued: 2004 MB, errsize: 0 B, current rate: 2490 kB/s
   ipos: 2004 MB, errors: 0, average rate: 3671 kB/s
   opos: 2004 MB, time since last successful read: 0 s
Finished

Because of the massive stalling that occured, average write rate ended up at 3.5 MB/sec instead of regular 20+MB/s.

Is this bug still alive, or related or does anyone here know what to look for? I'd really like to maintain responsiveness when working with USB drives.