Yes, setting CIFSMaxBufSize=65535 produced a jump from ~40-50mb/s to 70-80mb/s when doing dd or rsync -W copies to a CIFS mounted share. Setting it to the maximum worked fine too, but I've only tested with Samba on Linux - I don't know what the performance implication would be with a Windows client.
GVFS defaults the window size to 65535 (well, 65534 due to an issue they found there somehow) though it has other performance issues but it may explain reports of CIFS mounts being a lot slower then GVFS for some people. -- 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: In Progress Status in “linux” source package in Saucy: In Progress 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 AudioDevicesInUse: USER PID ACCESS COMMAND /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) IwConfig: 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 3.8.0.31.49 [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 3.8.13.8 RelatedPackageVersions: linux-restricted-modules-3.8.0-31-generic N/A linux-backports-modules-3.8.0-31-generic N/A linux-firmware 1.106 RfKill: 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1236607/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
