apport information ** Attachment added: "ProcCpuinfo.txt" https://bugs.launchpad.net/bugs/1582759/+attachment/4665343/+files/ProcCpuinfo.txt
-- 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/1582759 Title: Unexpected low write rate with Lexar JumpDrive P20 64GB flash drives Status in linux package in Ubuntu: Incomplete Bug description: We are hitting an unexpected low write rate with Lexar JumpDrive P20 64GB flash drives connected via USB 3.0 on multiple machines and across multiple kernels (3.13, 4.4). Expected is a write rate of 270 MB/s and we only get 45 MB/s. Under Mac OS X and Windows we get the expected write rate of 270 MB/s. The read rate is as expected at 400 MB/s on all operating systems. Lexar JumpDrive P20 details: http://www.lexar.com/flash-drives/jumpdrive-p20 Tested machines: * HP Z440 * Lenovo ThinkPad X250 Tested kernels: * 3.13 (Trusty) * 4.4 (Xenial) lsusb details: $ lsusb -t /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M |__ Port 2: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 5000M <-- USB 3.0 /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/11p, 480M |__ Port 1: Dev 2, If 0, Class=Vendor Specific Class, Driver=, 12M |__ Port 8: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M |__ Port 8: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M $ sudo lsusb -d 05dc:a212 -vvv Bus 003 Device 002: ID 05dc:a212 Lexar Media, Inc. Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 3.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 9 idVendor 0x05dc Lexar Media, Inc. idProduct 0xa212 bcdDevice 1.00 iManufacturer 1 Lexar iProduct 2 USB Flash Drive iSerial 3 0C5E8B182D1D474C bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 44 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 (Bus Powered) MaxPower 224mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 8 Mass Storage bInterfaceSubClass 6 SCSI bInterfaceProtocol 80 Bulk-Only iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0400 1x 1024 bytes bInterval 0 bMaxBurst 3 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x02 EP 2 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0400 1x 1024 bytes bInterval 0 bMaxBurst 3 Binary Object Store Descriptor: bLength 5 bDescriptorType 15 wTotalLength 22 bNumDeviceCaps 2 USB 2.0 Extension Device Capability: bLength 7 bDescriptorType 16 bDevCapabilityType 2 bmAttributes 0x00000006 Link Power Management (LPM) Supported SuperSpeed USB Device Capability: bLength 10 bDescriptorType 16 bDevCapabilityType 3 bmAttributes 0x00 wSpeedsSupported 0x000e Device can operate at Full Speed (12Mbps) Device can operate at High Speed (480Mbps) Device can operate at SuperSpeed (5Gbps) bFunctionalitySupport 2 Lowest fully-functional device speed is High Speed (480Mbps) bU1DevExitLat 10 micro seconds bU2DevExitLat 2047 micro seconds Device Status: 0x000c (Bus Powered) U1 Enabled U2 Enabled Write speed with kernel 4.4: $ sudo dd if=/dev/zero of=/dev/sdb bs=1M count=256 256+0 records in 256+0 records out 268435456 bytes (268 MB) copied, 5.98705 s, 44.8 MB/s Write speed under Mac OS X: $ sudo dd if=/dev/zero of=/dev/rdisk2 bs=1048576 count=256 256+0 records in 256+0 records out 268435456 bytes transferred in 0.941998 secs (284963933 bytes/sec) --- ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: test 1249 F.... pulseaudio /dev/snd/controlC1: test 1249 F.... pulseaudio CurrentDesktop: Unity DistroRelease: Ubuntu 16.04 HibernationDevice: RESUME=UUID=78c6220a-1695-4cce-bea4-54c32e2568ed InstallationDate: Installed on 2016-05-18 (0 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) MachineType: Hewlett-Packard HP EliteBook 840 G1 Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic root=UUID=81dd7ff9-ab0b-42f5-87f4-10ebb94e99f6 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8 RelatedPackageVersions: linux-restricted-modules-4.4.0-22-generic N/A linux-backports-modules-4.4.0-22-generic N/A linux-firmware 1.157 Tags: xenial Uname: Linux 4.4.0-22-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 03/25/2014 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: L71 Ver. 01.10 dmi.board.name: 198F dmi.board.vendor: Hewlett-Packard dmi.board.version: KBC Version 15.54 dmi.chassis.asset.tag: 1300144 dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnHewlett-Packard:bvrL71Ver.01.10:bd03/25/2014:svnHewlett-Packard:pnHPEliteBook840G1:pvrA3008CD10003:rvnHewlett-Packard:rn198F:rvrKBCVersion15.54:cvnHewlett-Packard:ct10:cvr: dmi.product.name: HP EliteBook 840 G1 dmi.product.version: A3008CD10003 dmi.sys.vendor: Hewlett-Packard To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1582759/+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
