| 1 |
So, I'm using dd to write the Gentoo LiveDVD ISO directly to an SDHC |
| 2 |
card. I was wondering why the transfer rate had slowed from 20MB/s to |
| 3 |
6MB/s, so I ran 'sudo tail -f /var/log/messages' to see if there were |
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I/O errors slowing things down. |
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|
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What I found was a flood-stream of message blocks that look like this: |
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|
| 8 |
Jun 17 19:21:18 saffron kernel: [39023.458632] usb-storage: |
| 9 |
queuecommand_lck called |
| 10 |
Jun 17 19:21:18 saffron kernel: [39023.458670] usb-storage: *** thread awakened. |
| 11 |
Jun 17 19:21:18 saffron kernel: [39023.458685] usb-storage: Command |
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WRITE_10 (10 bytes) |
| 13 |
Jun 17 19:21:18 saffron kernel: [39023.458687] usb-storage: 2a 00 00 |
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2b f3 80 00 00 f0 00 |
| 15 |
Jun 17 19:21:18 saffron kernel: [39023.458694] usb-storage: |
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rts51x_invoke_transport: <--- |
| 17 |
Jun 17 19:21:18 saffron kernel: [39023.458697] usb-storage: |
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rts51x_invoke_transport: working scsi, |
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intf->pm_usage_cnt:1,power.usage:1 |
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Jun 17 19:21:18 saffron kernel: [39023.458701] usb-storage: Bulk |
| 21 |
Command S 0x43425355 T 0x34ef L 122880 F 0 Trg 0 LUN 0 CL 10 |
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Jun 17 19:21:18 saffron kernel: [39023.458704] usb-storage: |
| 23 |
usb_stor_bulk_transfer_buf: xfer 31 bytes |
| 24 |
Jun 17 19:21:18 saffron kernel: [39023.458759] usb-storage: Status |
| 25 |
code 0; transferred 31/31 |
| 26 |
Jun 17 19:21:18 saffron kernel: [39023.458761] usb-storage: -- transfer complete |
| 27 |
Jun 17 19:21:18 saffron kernel: [39023.458763] usb-storage: Bulk |
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command transfer result=0 |
| 29 |
Jun 17 19:21:18 saffron kernel: [39023.458766] usb-storage: |
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usb_stor_bulk_transfer_sglist: xfer 122880 bytes, 18 entries |
| 31 |
Jun 17 19:21:18 saffron kernel: [39023.486031] usb-storage: Status |
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code 0; transferred 122880/122880 |
| 33 |
Jun 17 19:21:18 saffron kernel: [39023.486035] usb-storage: -- transfer complete |
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Jun 17 19:21:18 saffron kernel: [39023.486037] usb-storage: Bulk data |
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transfer result 0x0 |
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Jun 17 19:21:18 saffron kernel: [39023.486039] usb-storage: Attempting |
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to get CSW... |
| 38 |
Jun 17 19:21:18 saffron kernel: [39023.486042] usb-storage: |
| 39 |
usb_stor_bulk_transfer_buf: xfer 13 bytes |
| 40 |
Jun 17 19:21:18 saffron kernel: [39023.491787] usb-storage: Status |
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code 0; transferred 13/13 |
| 42 |
Jun 17 19:21:18 saffron kernel: [39023.491790] usb-storage: -- transfer complete |
| 43 |
Jun 17 19:21:18 saffron kernel: [39023.491793] usb-storage: Bulk |
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status result = 0 |
| 45 |
Jun 17 19:21:18 saffron kernel: [39023.491795] usb-storage: Bulk |
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Status S 0x53425355 T 0x34ef R 0 Stat 0x0 |
| 47 |
Jun 17 19:21:18 saffron kernel: [39023.491800] usb-storage: |
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rts51x_invoke_transport: state:2 |
| 49 |
Jun 17 19:21:18 saffron kernel: [39023.491802] usb-storage: |
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rts51x_modi_suspend_timer: <---, state:2 |
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Jun 17 19:21:18 saffron kernel: [39023.491805] usb-storage: |
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rts51x_modi_suspend_timer: ---> |
| 53 |
Jun 17 19:21:18 saffron kernel: [39023.491807] usb-storage: |
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rts51x_invoke_transport: ---> |
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Jun 17 19:21:18 saffron kernel: [39023.491809] usb-storage: scsi cmd |
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done, result=0x0 |
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Jun 17 19:21:18 saffron kernel: [39023.491815] usb-storage: *** thread sleeping. |
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|
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... Any idea what kernel configuration flag I may have enabled to |
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cause these to be continually generated? My first guess would be |
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something like 'kernel lock debugging'...if that's what I'm seeing |
| 62 |
here, where would I go to file a bug report against the usb-storage |
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subsystem? |
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|
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-- |
| 66 |
:wq |
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