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[Bug 1236607] UdevDb.txt


apport information

** Attachment added: "UdevDb.txt"

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  cifs.ko should default to CIFSMaxBufSize=65535

Status in “linux” package in Ubuntu:

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.
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
   /dev/snd/controlC1:  will       3215 F.... pulseaudio
   /dev/snd/controlC2:  will       3215 F.... pulseaudio
   /dev/snd/controlC0:  will       3215 F.... pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  DistroRelease: LinuxMint 15
  HibernationDevice: RESUME=UUID=0f40c3a5-e01e-4300-9363-384d60c1f893
  InstallationDate: Installed on 2012-07-12 (452 days ago)
  InstallationMedia: Linux Mint 13 "Maya" - Release amd64 (20120520)
   eth0      no wireless extensions.
   lo        no wireless extensions.
  MachineType: Gigabyte Technology Co., Ltd. P67A-UD3P-B3
  MarkForUpload: True
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
  Package: linux [origin: Ubuntu]
  PackageArchitecture: amd64
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/ROOT/mint-13@/boot/vmlinuz-3.8.0-31-generic root=/dev/sdg3 ro loglevel=7 boot=zfs rpool=ssdpool
  ProcVersionSignature: Ubuntu 3.8.0-31.46-generic
   linux-restricted-modules-3.8.0-31-generic N/A
   linux-backports-modules-3.8.0-31-generic  N/A
   linux-firmware                            1.106
   3: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  Tags: third-party-packages olivia
  Uname: Linux 3.8.0-31-generic x86_64
  UnreportableReason: This is not an official LinuxMint package. Please remove any third party package and try again.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom debian-tor dialout dip libvirtd lpadmin plugdev sambashare sudo vboxusers wireshark
  dmi.bios.date: 03/21/2012
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F9
  dmi.board.name: P67A-UD3P-B3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF9:bd03/21/2012:svnGigabyteTechnologyCo.,Ltd.:pnP67A-UD3P-B3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnP67A-UD3P-B3:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: P67A-UD3P-B3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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