I have a new USB 3.0 hard drive which appears to be throttled at approx 5Mbyte/sec. Is there a mystery kernel option that is required to enable full performance on these new drives? I have tried changing following: * Switching onboard USB 2.0 interfaces for a completely new USB 3.0 interface (xhci_pci) * Enabling and disabling the "USB attached SCSI" CONFIG_USB_UAS But drive performance stays limited at 5Mbyte/sec. I've settled on using the USB 3.0 interface, and the dmesg (below) reports "SuperSpeed" and looks ok. - The system is kernel 4.0.4 i686, on an HP xw6600 - Drive is a "Seagate Backup Plus for Mac" The drive does work on a separate Linux system -- 145Mbyte/sec (albeit only intermittently detecting the drive). That rules out any bad disk format or block alignment. In this case it is a Thinkpad X230, Slackware kernel 3.14.23, x86_64. I've compared kernel configs and nothing obvious has caught my attention in the USB/storage options. Unfortunately these are quite different systems that prevent me testing an identical kernel. Is anyone aware of what kernel difference this might be, or could it even be a bug on 32-bit systems? Thanks -- Mark usb 7-3: new SuperSpeed USB device number 5 using xhci_hcd usb 7-3: New USB device found, idVendor=0bc2, idProduct=a0a4 usb 7-3: New USB device strings: Mfr=2, Product=3, SerialNumber=1 usb 7-3: Product: Backup+ Desk Mac usb 7-3: Manufacturer: Seagate usb 7-3: SerialNumber: NA5R1K71 scsi host14: uas scsi 14:0:0:0: Direct-Access Seagate Backup+ Desk Mac 0505 PQ: 0 ANSI: 6 sd 14:0:0:0: [sdg] Spinning up disk... ............ready sd 14:0:0:0: [sdg] 976754645 4096-byte logical blocks: (4.00 TB/3.63 TiB) sd 14:0:0:0: [sdg] Write Protect is off sd 14:0:0:0: [sdg] Mode Sense: 4f 00 00 00 sd 14:0:0:0: [sdg] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA sd 14:0:0:0: [sdg] 976754645 4096-byte logical blocks: (4.00 TB/3.63 TiB) sdg: sdg1 sd 14:0:0:0: [sdg] 976754645 4096-byte logical blocks: (4.00 TB/3.63 TiB) sd 14:0:0:0: [sdg] Attached SCSI disk $ dd if=/dev/zero of=/mnt/backup/mark/TEST bs=1M ^C114+0 records in 114+0 records out 119537664 bytes (120 MB) copied, 25.8917 s, 4.6 MB/s $ grep USB .config # CONFIG_USB_SWITCH_FSA9480 is not set CONFIG_USB_NET_DRIVERS=y # CONFIG_USB_CATC is not set # CONFIG_USB_KAWETH is not set # CONFIG_USB_PEGASUS is not set # CONFIG_USB_RTL8150 is not set # CONFIG_USB_RTL8152 is not set # CONFIG_USB_USBNET is not set # CONFIG_USB_IPHETH is not set # CONFIG_MOUSE_SYNAPTICS_USB is not set # CONFIG_I2C_TINY_USB is not set # CONFIG_MFD_RTSX_USB is not set CONFIG_SND_USB=y CONFIG_SND_USB_AUDIO=m # CONFIG_SND_USB_UA101 is not set # CONFIG_SND_USB_USX2Y is not set CONFIG_SND_USB_CAIAQ=m CONFIG_SND_USB_CAIAQ_INPUT=y # CONFIG_SND_USB_US122L is not set # CONFIG_SND_USB_6FIRE is not set # CONFIG_SND_USB_HIFACE is not set # CONFIG_SND_USB_POD is not set # CONFIG_SND_USB_PODHD is not set # CONFIG_SND_USB_TONEPORT is not set # CONFIG_SND_USB_VARIAX is not set # USB HID support CONFIG_USB_HID=y CONFIG_USB_HIDDEV=y CONFIG_USB_OHCI_LITTLE_ENDIAN=y CONFIG_USB_SUPPORT=y CONFIG_USB_COMMON=y CONFIG_USB_ARCH_HAS_HCD=y CONFIG_USB=y CONFIG_USB_ANNOUNCE_NEW_DEVICES=y # Miscellaneous USB options CONFIG_USB_DEFAULT_PERSIST=y # CONFIG_USB_DYNAMIC_MINORS is not set CONFIG_USB_OTG=y # CONFIG_USB_OTG_WHITELIST is not set # CONFIG_USB_OTG_BLACKLIST_HUB is not set CONFIG_USB_OTG_FSM=m CONFIG_USB_MON=m # CONFIG_USB_WUSB_CBAF is not set # USB Host Controller Drivers # CONFIG_USB_C67X00_HCD is not set CONFIG_USB_XHCI_HCD=m CONFIG_USB_XHCI_PCI=m CONFIG_USB_EHCI_HCD=y CONFIG_USB_EHCI_ROOT_HUB_TT=y CONFIG_USB_EHCI_TT_NEWSCHED=y CONFIG_USB_EHCI_PCI=y # CONFIG_USB_EHCI_HCD_PLATFORM is not set # CONFIG_USB_OXU210HP_HCD is not set # CONFIG_USB_ISP116X_HCD is not set # CONFIG_USB_ISP1362_HCD is not set # CONFIG_USB_FUSBH200_HCD is not set # CONFIG_USB_FOTG210_HCD is not set # CONFIG_USB_OHCI_HCD is not set CONFIG_USB_UHCI_HCD=y # CONFIG_USB_SL811_HCD is not set # CONFIG_USB_R8A66597_HCD is not set # CONFIG_USB_HCD_TEST_MODE is not set # USB Device Class drivers # CONFIG_USB_ACM is not set # CONFIG_USB_PRINTER is not set # CONFIG_USB_WDM is not set # CONFIG_USB_TMC is not set # NOTE: USB_STORAGE depends on SCSI but BLK_DEV_SD may # also be needed; see USB_STORAGE Help for more info CONFIG_USB_STORAGE=m # CONFIG_USB_STORAGE_DEBUG is not set # CONFIG_USB_STORAGE_REALTEK is not set # CONFIG_USB_STORAGE_DATAFAB is not set # CONFIG_USB_STORAGE_FREECOM is not set # CONFIG_USB_STORAGE_ISD200 is not set # CONFIG_USB_STORAGE_USBAT is not set # CONFIG_USB_STORAGE_SDDR09 is not set # CONFIG_USB_STORAGE_SDDR55 is not set # CONFIG_USB_STORAGE_JUMPSHOT is not set # CONFIG_USB_STORAGE_ALAUDA is not set # CONFIG_USB_STORAGE_ONETOUCH is not set # CONFIG_USB_STORAGE_KARMA is not set # CONFIG_USB_STORAGE_CYPRESS_ATACB is not set # CONFIG_USB_STORAGE_ENE_UB6250 is not set CONFIG_USB_UAS=m # USB Imaging devices # CONFIG_USB_MDC800 is not set # CONFIG_USB_MICROTEK is not set # CONFIG_USBIP_CORE is not set # CONFIG_USB_MUSB_HDRC is not set # CONFIG_USB_DWC3 is not set # CONFIG_USB_DWC2 is not set # CONFIG_USB_CHIPIDEA is not set # CONFIG_USB_ISP1760 is not set # USB port drivers CONFIG_USB_SERIAL=m # CONFIG_USB_SERIAL_GENERIC is not set # CONFIG_USB_SERIAL_SIMPLE is not set # CONFIG_USB_SERIAL_AIRCABLE is not set # CONFIG_USB_SERIAL_ARK3116 is not set # CONFIG_USB_SERIAL_BELKIN is not set # CONFIG_USB_SERIAL_CH341 is not set # CONFIG_USB_SERIAL_WHITEHEAT is not set # CONFIG_USB_SERIAL_DIGI_ACCELEPORT is not set # CONFIG_USB_SERIAL_CP210X is not set # CONFIG_USB_SERIAL_CYPRESS_M8 is not set # CONFIG_USB_SERIAL_EMPEG is not set CONFIG_USB_SERIAL_FTDI_SIO=m # CONFIG_USB_SERIAL_VISOR is not set # CONFIG_USB_SERIAL_IPAQ is not set # CONFIG_USB_SERIAL_IR is not set # CONFIG_USB_SERIAL_EDGEPORT is not set # CONFIG_USB_SERIAL_EDGEPORT_TI is not set # CONFIG_USB_SERIAL_F81232 is not set # CONFIG_USB_SERIAL_GARMIN is not set # CONFIG_USB_SERIAL_IPW is not set # CONFIG_USB_SERIAL_IUU is not set # CONFIG_USB_SERIAL_KEYSPAN_PDA is not set # CONFIG_USB_SERIAL_KEYSPAN is not set # CONFIG_USB_SERIAL_KLSI is not set # CONFIG_USB_SERIAL_KOBIL_SCT is not set # CONFIG_USB_SERIAL_MCT_U232 is not set # CONFIG_USB_SERIAL_METRO is not set # CONFIG_USB_SERIAL_MOS7720 is not set # CONFIG_USB_SERIAL_MOS7840 is not set # CONFIG_USB_SERIAL_MXUPORT is not set # CONFIG_USB_SERIAL_NAVMAN is not set # CONFIG_USB_SERIAL_PL2303 is not set # CONFIG_USB_SERIAL_OTI6858 is not set # CONFIG_USB_SERIAL_QCAUX is not set # CONFIG_USB_SERIAL_QUALCOMM is not set # CONFIG_USB_SERIAL_SPCP8X5 is not set # CONFIG_USB_SERIAL_SAFE is not set # CONFIG_USB_SERIAL_SIERRAWIRELESS is not set # CONFIG_USB_SERIAL_SYMBOL is not set # CONFIG_USB_SERIAL_TI is not set # CONFIG_USB_SERIAL_CYBERJACK is not set # CONFIG_USB_SERIAL_XIRCOM is not set # CONFIG_USB_SERIAL_OPTION is not set # CONFIG_USB_SERIAL_OMNINET is not set # CONFIG_USB_SERIAL_OPTICON is not set # CONFIG_USB_SERIAL_XSENS_MT is not set # CONFIG_USB_SERIAL_WISHBONE is not set # CONFIG_USB_SERIAL_SSU100 is not set # CONFIG_USB_SERIAL_QT2 is not set # CONFIG_USB_SERIAL_DEBUG is not set # USB Miscellaneous drivers # CONFIG_USB_EMI62 is not set # CONFIG_USB_EMI26 is not set # CONFIG_USB_ADUTUX is not set # CONFIG_USB_SEVSEG is not set # CONFIG_USB_RIO500 is not set # CONFIG_USB_LEGOTOWER is not set # CONFIG_USB_LCD is not set # CONFIG_USB_LED is not set # CONFIG_USB_CYPRESS_CY7C63 is not set # CONFIG_USB_CYTHERM is not set # CONFIG_USB_IDMOUSE is not set # CONFIG_USB_FTDI_ELAN is not set # CONFIG_USB_APPLEDISPLAY is not set # CONFIG_USB_SISUSBVGA is not set # CONFIG_USB_LD is not set # CONFIG_USB_TRANCEVIBRATOR is not set # CONFIG_USB_IOWARRIOR is not set # CONFIG_USB_TEST is not set # CONFIG_USB_EHSET_TEST_FIXTURE is not set # CONFIG_USB_ISIGHTFW is not set # CONFIG_USB_YUREX is not set # CONFIG_USB_EZUSB_FX2 is not set # CONFIG_USB_HSIC_USB3503 is not set # CONFIG_USB_LINK_LAYER_TEST is not set # USB Physical Layer drivers CONFIG_USB_PHY=y # CONFIG_NOP_USB_XCEIV is not set # CONFIG_USB_ISP1301 is not set # CONFIG_USB_GADGET is not set # CONFIG_BCM_KONA_USB2_PHY is not set -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
