hi all.
之前把核心更新了,從2.6.8更新成2.6.16(apt-get install linux-image-2.6-686-smp),在那之後從pc寫入usb隨身碟的速度變得很慢,約12KB/s,但由usb->pc的速度又很快;用個13mb的檔案測的結果,由pc->usb花了18分鐘,usb->pc只花了3秒。
隨身碟在另一台windows筆電運作正常,寫入和讀取都很快。
有趣的是,在dmesg裡提到它是用ehci_hcd的…下面是dmesg:
Aug 24 16:17:18 ruwach kernel: usb 1-3: new high speed USB device using ehci_hcd and address 13
Aug 24 16:17:18 ruwach kernel: usb 1-3: configuration #1 chosen from 1 choice
Aug 24 16:17:18 ruwach kernel: scsi5 : SCSI emulation for USB Mass Storage devices
Aug 24 16:17:18 ruwach kernel: usb-storage: device found at 13
Aug 24 16:17:18 ruwach kernel: usb-storage: waiting for device to settle before scanning
Aug 24 16:17:23 ruwach kernel: Vendor: Multi Model: Flash Reader Rev: 1.00
Aug 24 16:17:23 ruwach kernel: Type: Direct-Access ANSI SCSI revision: 00
Aug 24 16:17:23 ruwach kernel: SCSI device sda: 1000448 512-byte hdwr sectors (512 MB)
Aug 24 16:17:23 ruwach kernel: sda: Write Protect is off
Aug 24 16:17:23 ruwach kernel: sda: Mode Sense: 03 00 00 00
Aug 24 16:17:23 ruwach kernel: sda: assuming drive cache: write through
Aug 24 16:17:23 ruwach kernel: SCSI device sda: 1000448 512-byte hdwr sectors (512 MB)
Aug 24 16:17:23 ruwach kernel: sda: Write Protect is off
Aug 24 16:17:23 ruwach kernel: sda: Mode Sense: 03 00 00 00
Aug 24 16:17:23 ruwach kernel: sda: assuming drive cache: write through
Aug 24 16:17:23 ruwach kernel: sda: sda1
Aug 24 16:17:23 ruwach kernel: sd 5:0:0:0: Attached scsi removable disk sda
Aug 24 16:17:23 ruwach kernel: usb-storage: device scan complete
Aug 24 16:17:27 ruwach kernel: usb 1-3: USB disconnect, address 13
有任何想法嗎?