kernel-packages team mailing list archive

[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1236607

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1236607

Title:
  cifs.ko should default to CIFSMaxBufSize=65535

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Win 7 and other clients can handle a CIFS max buffer size of 64k, and
  default to this value when talking to Windows or Linux SMB servers.
  The practical effect of this is drag-drop file operations in Windows
  can run at near gigabit speeds (80-90mb/s over a gigabit LAN) even
  when talking to a Linux Samba server.

  The 'cifs' filesystem on the other hand struggles to achieve this by
  default because it's buffer size is constrained to just 16k. Boosting
  the buffer size with a modprobe.d options file like so:

  options cifs CIFSMaxBufSize=65536

  or even:

  options cifs CIFSMaxBufSize=130048

  produces a speed up in file operations (as measured with rsync -W
  between two mountpoints, or dd | pv | dd) which is on par with the
  speed achieved by Windows - taking cifs from averaging 40-50 mb/s on
  my machine, to the 80-90 mb/s the same machine running Windows (and
  talking to a Linux samba server) can achieve.

  There doesn't seem to be any real downside to this in the common
  desktop use case in the modern age (memory is not a constraint), so
  shipping a modprobe.d cifs.conf file seems like a sensible way to
  close the perceived gap in user experience.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1236607/+subscriptions