usb 2.0。奇特的速度事件。
我的usb 2.0硬盘却只有663KB/s。而在windows下面测试，达到13.353710938MB/s。增强主机控制器接口（Enhanced Host Controller Interface，EHCI）
理论传输速度：480 Mbps
实际不如火线（理论传输速度：400 Mbps）。
火线：IEEE（Institute of Electrical and Electronics Engineers）1394标准
USB1.1标准速度：12Mbps
$ dmesg | tail -n 20
usb 6-3: USB disconnect, address 2
usb 6-3: new high speed USB device using ehci_hcd and address 3 scsi1 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 3
usb-storage: waiting for device to settle before scanning
Vendor: FUJITSU Model: MHT2040AT Rev: 0022
Type: Direct-Access ANSI SCSI revision: 00
SCSI device sdb: 78140161 512-byte hdwr sectors (40008 MB)
sdb: assuming drive cache: write through
SCSI device sdb: 78140161 512-byte hdwr sectors (40008 MB)
sdb: assuming drive cache: write through
sdb: sdb1 sdb2
sd 1:0:0:0: Attached scsi disk sdb
sd 1:0:0:0: Attached scsi generic sg0 type 0
usb-storage: device scan complete
sdb: Current: sense key: No Sense
Additional sense: No additional sense information
kjournald starting.Commit interval 5 seconds
EXT3 FS on sdb1, internal journal
EXT3-fs: mounted filesystem with ordered data mode.
$ lspci -v | grep 'USB 2.0'
0000:00:0b.3 USB Controller: ALi Corporation USB 2.0 Controller (rev 01) (prog-if 20 )
Subsystem: ALi Corporation USB 2.0 Controller
$ lsusb
Bus 006 Device 003: ID 13e0:2507
Bus 006 Device 001: ID 0000:0000
Bus 005 Device 001: ID 0000:0000
Bus 004 Device 001: ID 0000:0000
Bus 003 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
$ lsmod|grep usb
usb_storage 794882
scsi_mod 1459605 sg,sd_mod,sr_mod,sbp2,usb_storage
usbcore 1377004 usb_storage,ehci_hcd,ohci_hcd
$ sudo lsusb -v|head -n 17
Bus 006 Device 003: ID 13e0:2507
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x13e0
idProduct 0x2507
bcdDevice 0.01
iManufacturer 1 ValueDisk
iProduct 2 USB 2.0 Disk-On-The-Go
iSerial 3 200408164209
bNumConfigurations 1
http://forum.ubuntu.org.cn/weblogs/upload/6/119092998344c82a2ad469b.gifhttp://forum.ubuntu.org.cn/weblogs/upload/6/45321087844c82a71c5c88.jpg
$ awk -F[ 'BEGIN{RS = ""} /Disk-On-The-Go/' /proc/bus/usb/devices
T:Bus=06 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#=3 Spd=480 MxCh= 0
D:Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=1
P:Vendor=13e0 ProdID=2507 Rev= 0.01
S:Manufacturer=ValueDisk
S:Product=USB 2.0 Disk-On-The-Go
S:SerialNumber=200408164209
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=500mA
I:If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E:Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms 用hdparm调节一下sdb看一下。 暂时也只能这么做了。 hdparm不是只用于hdx的吗。能在sdx用？
后来又测试了一下。
$ date;cp /home/exp/install/游戏/NorthlandDemo.run /media/USB-FAT/;date
2006年 07月 28日 星期五 14:58:26 CST
2006年 07月 28日 星期五 14:59:03 CST
$ date;cp /home/exp/install/游戏/NorthlandDemo.run /media/USB-EXT3/;date
2006年 07月 28日 星期五 15:02:52 CST
2006年 07月 28日 星期五 15:04:50 CST
$ ll /home/exp/install/游戏/NorthlandDemo.run
-rw-r--r-- 1 exp exp 80150706 2006-03-27 10:06 /home/exp/install/游戏/NorthlandDemo.run
FAT分区：2‘166’235.297297297 B/s
EXT分区：679`243.271186441 B/s
奇怪了。日志文件系统慢这样多？
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