[sane-devel] Scanner Button Daemon [scanbd]: high CPU utilization

[Rastislav David]

Hello all,

I've succesfully compiled scanbd for my Canon CanoScan LiDE 110 on my
ARM powered NAS Linksys DNS-323 running Debian Wheezy.

It works :) however there are few issues.
1) scanbd is using 100% of CPU load and thus misses some button presses
2) does not react on Pdf button (nothing logged into console when
pressed) There are 4 buttons. [Pdf Auto-Scan Copy Email]

If I start daemon with: ./scanbd -df -c scanbd.conf

I see:

./scanbd: debug on: level: 7
./scanbd: dropping privs to uid saned
./scanbd: dropping privs to uid scanner
./scanbd: group scanner has member:
./scanbd: saned
./scanbd: drop privileges to gid: 104
./scanbd: Running as effective gid 104
./scanbd: drop privileges to uid: 110
./scanbd: Running as effective uid 110
./scanbd: dbus_init
./scanbd: dbus match type='signal',interface='org.freedesktop.Hal.Manager'
./scanbd: sane version 1.0
./scanbd: Scanning for local-only devices
./scanbd: found device: genesys:libusb:001:011 Canon LiDE 110 flatbed
scanner
./scanbd: start_sane_threads
./scanbd: Starting poll thread for genesys:libusb:001:011
./scanbd: Thread started for device genesys:libusb:001:011
./scanbd: sane_poll
./scanbd: start udev thread
./scanbd: timeout: 400 ms
./scanbd: udev thread started
./scanbd: Iteration on dbus call
./scanbd: no device from udev
./scanbd: no device from udev
....
300x / second
./scanbd: no device from udev
./scanbd: no device from udev
./scanbd: no device from udev
./scanbd: no device from udev
./scanbd: no device from udev
./scanbd: found 41 options for device genesys:libusb:001:011
./scanbd: sane_find_matching_options
./scanbd: found 5 actions in section (null)
./scanbd: checking action scan with filter: ^scan.*
./scanbd: found active option[2] mode (type: 3) for device
genesys:libusb:001:01
1
./scanbd: found active option[4] preview (type: 0) for device
genesys:libusb:001
:011
./scanbd: found active option[5] depth (type: 1) for device
genesys:libusb:001:0
11
./scanbd: found active option[6] resolution (type: 1) for device
genesys:libusb:
001:011
./scanbd: found active option[8] tl-x (type: 2) for device
genesys:libusb:001:01
1
./scanbd: found active option[9] tl-y (type: 2) for device
genesys:libusb:001:01
1
./scanbd: found active option[10] br-x (type: 2) for device
genesys:libusb:001:011
./scanbd: found active option[11] br-y (type: 2) for device
genesys:libusb:001:011


these "no device from udev" messages are generated about 300/s which I
think is causing high CPU utilization.

in scandb.conf I left all devices as they were and for actions scan
email and copy I've changed script to /etc/scanbd/action.script.
This script works fine for said 3 buttons.

Can You help where could be the issue with High CPU utilization?
Is there some problem with configuration?

Rastislav

P.S: for scanbd to compile I had to change
-I/usr/local/include/dbus-1.0/include to
-I/usr/lib/arm-linux-gnueabi/dbus-1.0/include
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