Public bug reported:
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.
** Affects: linux-meta (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "cifs.conf"
https://bugs.launchpad.net/bugs/1236607/+attachment/3865304/+files/cifs.conf
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https://bugs.launchpad.net/bugs/1236607
Title:
cifs.ko should default to CIFSMaxBufSize=65535
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