Re: idle USB harddrive spins up with 2.6.28-rc7 and 2.6.27.8, butnot with 2.6.26.8

From: Andrew Morton
Date: Wed Dec 10 2008 - 16:32:55 EST

(cc linux-usb)

On Tue, 9 Dec 2008 18:12:33 -0500
CSights <csights@xxxxxxxxxxx> wrote:

> Hi LKML,
> I've got an IDE harddrive in a USB external enclosure. It is /dev/sda.
> When I'm compiling the kernel or doing other things on /dev/hda1 the USB
> harddrive (sda1) will spin-up or not spin-down. This happens with kernel
> versions 2.6.28-rc7 and 2.6.27.8, but not with 2.6.26.8.
> Also, I'm using laptop-mode-tools to turn on laptop mode.
> I used the "btrace" script on /dev/sda while compiling a kernel on /dev/hda1.
> While running 2.6.26.8 btrace did not output anything. With 2.6.27.8 and
> 2.6.28-rc7 a load of stuff was going on with /dev/sda.
> I don't know what it means, but it is probably what is causing the harddrive
> to spin up. :) Hopefully someone besides me will consider this
> a "regression". Let me know if you need any other info.
>
> Thanks!
> C.
>
> Using 2.6.26.8, btrace of /dev/sda while compiling on /dev/hda1
> did not output anything.
>
> Using 2.6.27.8, btrace of /dev/sda while compiling on /dev/hda1
> Dec 9 11:15:32 localhost logger: 8,0 0 1 0.000000000 1109 A
> WS 14375 + 8 <- (8,1) 14312
> Dec 9 11:15:32 localhost logger: 8,0 0 2 0.000006705 1109 Q
> WS 14375 + 8 [kjournald]
> Dec 9 11:15:32 localhost logger: 8,0 0 3 0.000043581 1109 G
> WS 14375 + 8 [kjournald]
> Dec 9 11:15:32 localhost logger: 8,0 0 4 0.000065651 1109 P
> N [kjournald]
> Dec 9 11:15:32 localhost logger: 8,0 0 5 0.000076267 1109 I
> W 14375 + 8 [kjournald]
> Dec 9 11:15:32 localhost logger: 8,0 0 6 0.000300318 1109 D
> W 14375 + 8 [kjournald]
> Dec 9 11:15:32 localhost logger: 8,0 0 7 0.000423518 1109 U
> N [kjournald] 1
> Dec 9 11:15:32 localhost logger: 8,0 0 8 0.010028373 3 C
> W 14375 + 8 [0]
> Dec 9 11:15:35 localhost logger: 8,0 0 9 3.219049689 1109 A
> WS 14383 + 8 <- (8,1) 14320
> Dec 9 11:15:35 localhost logger: 8,0 0 10 3.219058350 1109 Q
> WS 14383 + 8 [kjournald]
> Dec 9 11:15:35 localhost logger: 8,0 0 11 3.219095505 1109 G
> WS 14383 + 8 [kjournald]
> Dec 9 11:15:35 localhost logger: 8,0 0 12 3.219115061 1109 P
> N [kjournald]
> Dec 9 11:15:35 localhost logger: 8,0 0 13 3.219127074 1109 I
> W 14383 + 8 [kjournald]
> Dec 9 11:15:35 localhost logger: 8,0 0 14 3.219344699 1109 D
> W 14383 + 8 [kjournald]
> Dec 9 11:15:35 localhost logger: 8,0 0 15 3.219543607 1109 U
> N [kjournald] 1
> Dec 9 11:15:35 localhost logger: 8,0 0 16 3.229477275 3 C
> W 14383 + 8 [0]
> Dec 9 11:15:40 localhost logger: 8,0 0 17 8.372429561 1109 A
> WS 14391 + 8 <- (8,1) 14328
> Dec 9 11:15:40 localhost logger: 8,0 0 18 8.372437663 1109 Q
> WS 14391 + 8 [kjournald]
> Dec 9 11:15:40 localhost logger: 8,0 0 19 8.372474539 1109 G
> WS 14391 + 8 [kjournald]
> Dec 9 11:15:40 localhost logger: 8,0 0 20 8.372496329 1109 P
> N [kjournald]
> Dec 9 11:15:40 localhost logger: 8,0 0 21 8.372508063 1109 I
> W 14391 + 8 [kjournald]
> Dec 9 11:15:40 localhost logger: 8,0 0 22 8.372729320 1109 D
> W 14391 + 8 [kjournald]
> Dec 9 11:15:40 localhost logger: 8,0 0 23 8.372839669 1109 U
> N [kjournald] 1
> Dec 9 11:15:40 localhost logger: 8,0 0 24 8.382665781 3 C
> W 14391 + 8 [0]
> Dec 9 11:15:49 localhost logger: 8,0 0 25 17.082110738 1109 A
> WS 14399 + 8 <- (8,1) 14336
> Dec 9 11:15:49 localhost logger: 8,0 0 26 17.082119119 1109 Q
> WS 14399 + 8 [kjournald]
> Dec 9 11:15:49 localhost logger: 8,0 0 27 17.082156834 1109 G
> WS 14399 + 8 [kjournald]
> Dec 9 11:15:49 localhost logger: 8,0 0 28 17.082180859 1109 P
> N [kjournald]
> Dec 9 11:15:49 localhost logger: 8,0 0 29 17.082193431 1109 I
> W 14399 + 8 [kjournald]
> Dec 9 11:15:49 localhost logger: 8,0 0 30 17.082418878 1109 D
> W 14399 + 8 [kjournald]
> Dec 9 11:15:49 localhost logger: 8,0 0 31 17.082527831 1109 U
> N [kjournald] 1
> Dec 9 11:15:49 localhost logger: 8,0 0 32 17.092196101 3 C
> W 14399 + 8 [0]
> ...etc...
>
> Using kernel 2.6.28-rc7, btrace of /dev/sda while compiling on /dev/hda1
> Dec 9 17:48:37 localhost logger: 8,0 0 1 0.000000000 1129 A
> WS 12567 + 8 <- (8,1) 12504
> Dec 9 17:48:37 localhost logger: 8,0 0 2 0.000005587 1129 Q
> WS 12567 + 8 [kjournald]
> Dec 9 17:48:37 localhost logger: 8,0 0 3 0.000038553 1129 G
> WS 12567 + 8 [kjournald]
> Dec 9 17:48:37 localhost logger: 8,0 0 4 0.000061460 1129 P
> N [kjournald]
> Dec 9 17:48:37 localhost logger: 8,0 0 5 0.000074032 1129 I
> W 12567 + 8 [kjournald]
> Dec 9 17:48:37 localhost logger: 8,0 0 6 0.000266235 1129 D
> W 12567 + 8 [kjournald]
> Dec 9 17:48:37 localhost logger: 8,0 0 7 0.000372394 1129 U
> N [kjournald] 1
> Dec 9 17:48:37 localhost logger: 8,0 0 8 0.010619230 3 C
> W 12567 + 8 [0]
> Dec 9 17:49:19 localhost logger: 8,0 0 9 41.770854333 1129 A
> WS 12575 + 8 <- (8,1) 12512
> Dec 9 17:49:19 localhost logger: 8,0 0 10 41.770862156 1129 Q
> WS 12575 + 8 [kjournald]
> Dec 9 17:49:19 localhost logger: 8,0 0 11 41.770895121 1129 G
> WS 12575 + 8 [kjournald]
> Dec 9 17:49:19 localhost logger: 8,0 0 12 41.770917191 1129 P
> N [kjournald]
> Dec 9 17:49:19 localhost logger: 8,0 0 13 41.770929483 1129 I
> W 12575 + 8 [kjournald]
> Dec 9 17:49:19 localhost logger: 8,0 0 14 41.771122524 1129 D
> W 12575 + 8 [kjournald]
> Dec 9 17:49:19 localhost logger: 8,0 0 15 41.771247680 1129 U
> N [kjournald] 1
> Dec 9 17:49:19 localhost logger: 8,0 0 16 41.780654465 3 C
> W 12575 + 8 [0]
> Dec 9 17:49:22 localhost logger: 8,0 0 17 44.820030708 1129 A
> WS 12583 + 8 <- (8,1) 12520
> Dec 9 17:49:22 localhost logger: 8,0 0 18 44.820038530 1129 Q
> WS 12583 + 8 [kjournald]
> Dec 9 17:49:22 localhost logger: 8,0 0 19 44.820069539 1129 G
> WS 12583 + 8 [kjournald]
> Dec 9 17:49:22 localhost logger: 8,0 0 20 44.820091050 1129 P
> N [kjournald]
> Dec 9 17:49:22 localhost logger: 8,0 0 21 44.820103622 1129 I
> W 12583 + 8 [kjournald]
> Dec 9 17:49:22 localhost logger: 8,0 0 22 44.820291914 1129 D
> W 12583 + 8 [kjournald]
> Dec 9 17:49:22 localhost logger: 8,0 0 23 44.820386898 1129 U
> N [kjournald] 1
> Dec 9 17:49:22 localhost logger: 8,0 0 24 44.830135906 3 C
> W 12583 + 8 [0]
> ...etc...

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