Re: idle USB harddrive spins up with 2.6.28-rc7 and 2.6.27.8, but not with 2.6.26.8

From: CSights
Date: Thu Dec 11 2008 - 11:43:56 EST

Hi LKML,

> This is not a USB issue. usb-storage merely passes on to the device
> the requests it gets from higher up. If those requests cause the drive
> to spin-up or not spin-down, blame the higher-up subsystems.

I am currently doing recompiles to see when the below problem first showed
up. The change in behavior started somewhere between 2.6.27.5 and 2.6.27.8 .
Eventually I will be able to say that the change occurred somewhere between
2.6.27.n and 2.6.27.n+1. I'm using an old k6 233 mHz, so it might take a few
days!
I am not a kernel hacker, but I would guess there was some change in the
journal code that causes it to "leak" journal commits to a non-active device
when triggered by the activity of another device.

C.

> > > 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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