Hi, I have noticed that flash usb storage devices are very slow on my Samsung Q45 laptop compared to my supermicro x7dwa-n workstation, first the good performance: uname -a Linux ubermicro 2.6.31-xen-r11 #1 SMP Wed Jan 27 18:13:45 GMT 2010 x86_64 Intel(R) Xeon(R) CPU E5420 @ 2.50GHz GenuineIntel GNU/Linux lsscsi | grep sdd [9:0:0:0] disk Kingston DT 101 II 1.00 /dev/sdd hdparm -t /dev/sdd /dev/sdd: Timing buffered disk reads: 66 MB in 3.04 seconds = 21.70 MB/sec lspci | grep -i usb 00:1d.0 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #1 (rev 09) 00:1d.1 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #2 (rev 09) 00:1d.2 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #3 (rev 09) 00:1d.3 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #4 (rev 09) 00:1d.7 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset EHCI USB2 Controller (rev 09) 02:01.0 USB Controller: NEC Corporation USB (rev 43) 02:01.1 USB Controller: NEC Corporation USB (rev 43) 02:01.2 USB Controller: NEC Corporation USB 2.0 (rev 04) 09:04.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 62) 09:04.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 62) 09:04.2 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 65) And now the Q45, note that I have tried kernel 2.6.31 and the performance is the same: uname -a Linux samsung 2.6.32-gentoo-r3 #4 SMP Thu Feb 4 14:21:51 GMT 2010 i686 Intel(R) Core(TM)2 Duo CPU T5450 @ 1.66GHz GenuineIntel GNU/Linux lsscsi | grep sda [2:0:0:0] disk Kingston DT 101 II 1.00 /dev/sda samsung linux-2.6.32-gentoo-r4 # hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 24 MB in 3.22 seconds = 7.46 MB/sec 1/3 of the speed, but if I try the same on a usb hard disk the performance is much better: hdparm -t /dev/sdb /dev/sdb: Timing buffered disk reads: 88 MB in 3.02 seconds = 29.12 MB/sec Which is around the same speed I get on my workstation. Some more info from the q45: lspci | grep -i usb 00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 03) 00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 03) 00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 03) 00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 03) 00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 03) 00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 03) 00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 03) dmesg | grep -i usb usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver drivers/usb/core/inode.c: creating file 'devices' drivers/usb/core/inode.c: creating file '001' ehci_hcd 0000:00:1a.7: new USB bus registered, assigned bus number 1 ehci_hcd 0000:00:1a.7: supports USB remote wakeup ehci_hcd 0000:00:1a.7: USB 2.0 started, EHCI 1.00 usb usb1: default language 0x0409 usb usb1: udev 1, busnum 1, minor = 0 usb usb1: New USB device found, idVendor=1d6b, idProduct=0002 usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb usb1: Product: EHCI Host Controller usb usb1: Manufacturer: Linux 2.6.32-gentoo-r3 ehci_hcd usb usb1: SerialNumber: 0000:00:1a.7 usb usb1: uevent usb usb1: usb_probe_device usb usb1: configuration #1 chosen from 1 choice usb usb1: adding 1-0:1.0 (config #1, interface 0) usb 1-0:1.0: uevent hub 1-0:1.0: usb_probe_interface hub 1-0:1.0: usb_probe_interface - got id hub 1-0:1.0: USB hub found hub 1-0:1.0: no power switching (usb 1.0) drivers/usb/core/inode.c: creating file '001' drivers/usb/core/inode.c: creating file '002' ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 2 ehci_hcd 0000:00:1d.7: supports USB remote wakeup ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00 usb usb2: default language 0x0409 usb usb2: udev 1, busnum 2, minor = 128 usb usb2: New USB device found, idVendor=1d6b, idProduct=0002 usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb usb2: Product: EHCI Host Controller usb usb2: Manufacturer: Linux 2.6.32-gentoo-r3 ehci_hcd usb usb2: SerialNumber: 0000:00:1d.7 usb usb2: uevent usb usb2: usb_probe_device usb usb2: configuration #1 chosen from 1 choice usb usb2: adding 2-0:1.0 (config #1, interface 0) usb 2-0:1.0: uevent hub 2-0:1.0: usb_probe_interface hub 2-0:1.0: usb_probe_interface - got id hub 2-0:1.0: USB hub found hub 2-0:1.0: no power switching (usb 1.0) drivers/usb/core/inode.c: creating file '001' ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver uhci_hcd: USB Universal Host Controller Interface driver drivers/usb/core/inode.c: creating file '003' uhci_hcd 0000:00:1a.0: new USB bus registered, assigned bus number 3 usb usb3: default language 0x0409 usb usb3: udev 1, busnum 3, minor = 256 usb usb3: New USB device found, idVendor=1d6b, idProduct=0001 usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb usb3: Product: UHCI Host Controller usb usb3: Manufacturer: Linux 2.6.32-gentoo-r3 uhci_hcd usb usb3: SerialNumber: 0000:00:1a.0 usb usb3: uevent usb usb3: usb_probe_device usb usb3: configuration #1 chosen from 1 choice usb usb3: adding 3-0:1.0 (config #1, interface 0) usb 3-0:1.0: uevent hub 3-0:1.0: usb_probe_interface hub 3-0:1.0: usb_probe_interface - got id hub 3-0:1.0: USB hub found hub 3-0:1.0: no power switching (usb 1.0) drivers/usb/core/inode.c: creating file '001' drivers/usb/core/inode.c: creating file '004' uhci_hcd 0000:00:1a.1: new USB bus registered, assigned bus number 4 usb usb4: default language 0x0409 usb usb4: udev 1, busnum 4, minor = 384 usb usb4: New USB device found, idVendor=1d6b, idProduct=0001 usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb usb4: Product: UHCI Host Controller usb usb4: Manufacturer: Linux 2.6.32-gentoo-r3 uhci_hcd usb usb4: SerialNumber: 0000:00:1a.1 usb usb4: uevent usb usb4: usb_probe_device usb usb4: configuration #1 chosen from 1 choice usb usb4: adding 4-0:1.0 (config #1, interface 0) usb 4-0:1.0: uevent hub 4-0:1.0: usb_probe_interface hub 4-0:1.0: usb_probe_interface - got id hub 4-0:1.0: USB hub found hub 4-0:1.0: no power switching (usb 1.0) drivers/usb/core/inode.c: creating file '001' drivers/usb/core/inode.c: creating file '005' uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 5 usb usb5: default language 0x0409 usb usb5: udev 1, busnum 5, minor = 512 usb usb5: New USB device found, idVendor=1d6b, idProduct=0001 usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb usb5: Product: UHCI Host Controller usb usb5: Manufacturer: Linux 2.6.32-gentoo-r3 uhci_hcd usb usb5: SerialNumber: 0000:00:1d.0 usb usb5: uevent usb usb5: usb_probe_device usb usb5: configuration #1 chosen from 1 choice usb usb5: adding 5-0:1.0 (config #1, interface 0) usb 5-0:1.0: uevent hub 5-0:1.0: usb_probe_interface hub 5-0:1.0: usb_probe_interface - got id hub 5-0:1.0: USB hub found hub 5-0:1.0: no power switching (usb 1.0) drivers/usb/core/inode.c: creating file '001' drivers/usb/core/inode.c: creating file '006' uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 6 usb usb6: default language 0x0409 usb usb6: udev 1, busnum 6, minor = 640 usb usb6: New USB device found, idVendor=1d6b, idProduct=0001 usb usb6: New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb usb6: Product: UHCI Host Controller usb usb6: Manufacturer: Linux 2.6.32-gentoo-r3 uhci_hcd usb usb6: SerialNumber: 0000:00:1d.1 usb usb6: uevent usb usb6: usb_probe_device usb usb6: configuration #1 chosen from 1 choice usb usb6: adding 6-0:1.0 (config #1, interface 0) usb 6-0:1.0: uevent hub 6-0:1.0: usb_probe_interface hub 6-0:1.0: usb_probe_interface - got id hub 6-0:1.0: USB hub found hub 6-0:1.0: no power switching (usb 1.0) drivers/usb/core/inode.c: creating file '001' drivers/usb/core/inode.c: creating file '007' uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 7 usb usb7: default language 0x0409 usb usb7: udev 1, busnum 7, minor = 768 usb usb7: New USB device found, idVendor=1d6b, idProduct=0001 usb usb7: New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb usb7: Product: UHCI Host Controller usb usb7: Manufacturer: Linux 2.6.32-gentoo-r3 uhci_hcd usb usb7: SerialNumber: 0000:00:1d.2 usb usb7: uevent usb usb7: usb_probe_device usb usb7: configuration #1 chosen from 1 choice usb usb7: adding 7-0:1.0 (config #1, interface 0) usb 7-0:1.0: uevent hub 7-0:1.0: usb_probe_interface hub 7-0:1.0: usb_probe_interface - got id hub 7-0:1.0: USB hub found hub 7-0:1.0: no power switching (usb 1.0) drivers/usb/core/inode.c: creating file '001' usbcore: registered new interface driver usblp Initializing USB Mass Storage driver... usbcore: registered new interface driver usb-storage USB Mass Storage support registered. usbcore: registered new interface driver libusual usbcore: registered new interface driver hiddev usbcore: registered new interface driver usbhid usbhid: v2.6:USB HID core driver usb 1-2: new high speed USB device using ehci_hcd and address 2 usb 1-2: skipped 1 descriptor after configuration usb 1-2: skipped 5 descriptors after interface usb 1-2: skipped 1 descriptor after endpoint usb 1-2: skipped 10 descriptors after interface usb 1-2: default language 0x0409 usb 1-2: udev 2, busnum 1, minor = 1 usb 1-2: New USB device found, idVendor=0ac8, idProduct=c302 usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 usb 1-2: Product: Vega USB 2.0 Camera. usb 1-2: Manufacturer: Vimicro Corp. usb 1-2: uevent usb 1-2: usb_probe_device usb 1-2: configuration #1 chosen from 1 choice usb 1-2: adding 1-2:1.0 (config #1, interface 0) usb 1-2:1.0: uevent usb 1-2: adding 1-2:1.1 (config #1, interface 1) usb 1-2:1.1: uevent drivers/usb/core/inode.c: creating file '002' usb 2-1: new high speed USB device using ehci_hcd and address 2 usb 2-1: default language 0x0409 usb 2-1: udev 2, busnum 2, minor = 129 usb 2-1: New USB device found, idVendor=0951, idProduct=1625 usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 2-1: Product: DT 101 II usb 2-1: Manufacturer: Kingston usb 2-1: SerialNumber: 0019E06B0840F97037620ABA usb 2-1: uevent usb 2-1: usb_probe_device usb 2-1: configuration #1 chosen from 1 choice usb 2-1: adding 2-1:1.0 (config #1, interface 0) usb 2-1:1.0: uevent usb-storage 2-1:1.0: usb_probe_interface usb-storage 2-1:1.0: usb_probe_interface - got id scsi2 : SCSI emulation for USB Mass Storage devices drivers/usb/core/inode.c: creating file '002' usb-storage: device found at 2 usb-storage: waiting for device to settle before scanning usb 7-1: new full speed USB device using uhci_hcd and address 2 usb usb4: suspend_rh (auto-stop) usb usb6: suspend_rh (auto-stop) usb 7-1: skipped 1 descriptor after interface usb 7-1: default language 0x0409 usb 7-1: udev 2, busnum 7, minor = 769 usb 7-1: New USB device found, idVendor=0a5c, idProduct=2101 usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 7-1: Product: BCM92045NMD usb 7-1: Manufacturer: Broadcom Corp usb 7-1: SerialNumber: 000278766EB1 usb 7-1: uevent usb 7-1: usb_probe_device usb 7-1: configuration #1 chosen from 1 choice usb 7-1: adding 7-1:1.0 (config #1, interface 0) usb 7-1:1.0: uevent usb 7-1: adding 7-1:1.1 (config #1, interface 1) usb 7-1:1.1: uevent usb 7-1: adding 7-1:1.2 (config #1, interface 2) usb 7-1:1.2: uevent usb 7-1: adding 7-1:1.3 (config #1, interface 3) usb 7-1:1.3: uevent drivers/usb/core/inode.c: creating file '002' usb usb3: suspend_rh (auto-stop) usb usb5: suspend_rh (auto-stop) usb usb4: bus auto-suspend usb usb4: suspend_rh usb usb6: bus auto-suspend usb usb6: suspend_rh usb usb3: bus auto-suspend usb usb3: suspend_rh usb usb5: bus auto-suspend usb usb5: suspend_rh usb-storage: device scan complete usb usb3: uevent usb 3-0:1.0: uevent usb usb4: uevent usb 4-0:1.0: uevent usb usb1: uevent usb 1-0:1.0: uevent usb 1-2: uevent usb 1-2:1.0: uevent usb 1-2:1.1: uevent usb usb5: uevent usb 5-0:1.0: uevent usb usb6: uevent usb 6-0:1.0: uevent usb usb7: uevent usb 7-0:1.0: uevent usb 7-1: uevent usb 7-1:1.0: uevent usb 7-1:1.1: uevent usb 7-1:1.2: uevent usb 7-1:1.3: uevent usb usb2: uevent usb 2-0:1.0: uevent usb 2-1: uevent usb 2-1:1.0: uevent usb usb4: uevent usb usb7: uevent usb usb5: uevent usb usb1: uevent usb 1-2: uevent usb usb3: uevent usb usb6: uevent usb 7-1: uevent usb usb2: uevent usb 2-1: uevent usb 2-1:1.0: uevent usb 2-1: uevent usb 2-1:1.0: uevent usb usb3: uevent usb 3-0:1.0: uevent usb usb4: uevent usb 4-0:1.0: uevent usb usb1: uevent usb 1-0:1.0: uevent usb 1-2: uevent usb 1-2:1.0: uevent usb 1-2:1.1: uevent usb usb5: uevent usb 5-0:1.0: uevent usb usb6: uevent usb 6-0:1.0: uevent usb usb7: uevent usb 7-0:1.0: uevent usb 7-1: uevent usb 7-1:1.0: uevent usb 7-1:1.1: uevent usb 7-1:1.2: uevent usb 7-1:1.3: uevent usb usb2: uevent usb 2-0:1.0: uevent usb 2-1: uevent usb 2-1:1.0: uevent Why would it be so much slower on this laptop? Andy -- 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
