I belive the poll in question is:
(gdb) where
#0 0x00007f74414c2d40 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007f7441a08136 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007f7441a0859a in g_main_loop_run () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00000000004143a7 in main ()
I see a poll with a zero timeout, followed by a failed read on an
eventfd and then a 100ms poll with a timeout:
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=5, events=POLLIN},
{fd=6, events=POLLIN}, {fd=9, events=POLLIN}, {fd=7, events=POLLIN}], 6, 0) = 0
(Timeout)
read(4, 0x7fffd02fb220, 16) = -1 EAGAIN (Resource temporarily
unavailable)
recvfrom(3, 0x15f1ef4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=5, events=POLLIN},
{fd=6, events=POLLIN}, {fd=9, events=POLLIN}, {fd=7, events=POLLIN}], 6, 100) =
0 (Timeout)
The fd's are as follow:
lr-x------ 1 king king 64 Feb 27 09:04 0 -> /dev/null
l-wx------ 1 king king 64 Feb 27 09:04 1 -> /home/king/.xsession-errors
lrwx------ 1 king king 64 Feb 27 09:04 10 -> anon_inode:[eventfd]
lrwx------ 1 king king 64 Feb 27 09:04 11 -> anon_inode:[eventfd]
l-wx------ 1 king king 64 Feb 27 09:04 2 -> /home/king/.xsession-errors
lrwx------ 1 king king 64 Feb 27 09:04 3 -> socket:[13455]
lr-x------ 1 king king 64 Feb 27 09:04 4 -> anon_inode:[eventfd]
l-wx------ 1 king king 64 Feb 27 09:04 5 -> socket:[13460]
l-wx------ 1 king king 64 Feb 27 09:04 6 -> socket:[13249]
lrwx------ 1 king king 64 Feb 27 09:04 7 -> socket:[13251]
lrwx------ 1 king king 64 Feb 27 09:04 8 -> socket:[13592]
lrwx------ 1 king king 64 Feb 27 09:04 9 -> socket:[13600]
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager-applet in Ubuntu.
https://bugs.launchpad.net/bugs/934117
Title:
nm-applet is calling poll() at ~10Hz
Status in The Ubuntu Power Consumption Project:
New
Status in “network-manager-applet” package in Ubuntu:
Confirmed
Bug description:
I've noticed that nm-applet is polling at ~10Hz. This seems to occur
only when I am only connected to the network (ethernet or wireless).
A strace of nm-applet is as follows:
recvfrom(3, 0x101e304, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=5, events=POLLIN},
{fd=6, events=POLLIN}, {fd=8, events=POLLIN}, {fd=7, events=POLLIN}], 6, 100) =
0 (Timeout)
read(4, 0x7fff27127870, 16) = -1 EAGAIN (Resource temporarily
unavailable)
recvfrom(3, 0x101e304, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=5, events=POLLIN},
{fd=6, events=POLLIN}, {fd=8, events=POLLIN}, {fd=7, events=POLLIN}], 6, 0) = 0
(Timeout)
read(4, 0x7fff27127870, 16) = -1 EAGAIN (Resource temporarily
unavailable)
recvfrom(3, 0x101e304, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=5, events=POLLIN},
{fd=6, events=POLLIN}, {fd=8, events=POLLIN}, {fd=7, events=POLLIN}], 6, 100) =
0 (Timeout)
read(4, 0x7fff27127870, 16) = -1 EAGAIN (Resource temporarily
unavailable)
recvfrom(3, 0x101e304, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=5, events=POLLIN},
{fd=6, events=POLLIN}, {fd=8, events=POLLIN}, {fd=7, events=POLLIN}], 6, 0) = 0
(Timeout)
So it seems we have a poll using 100 millisecond timeout and also a 0
millisecond timeout. The 0 millisecond timeout is basically a busy
poll which seems a little excessive. The 100 millisecond timeout is
the root cause of the 10Hz events/second wakeup.
This is causing excessive wakeups which keeps the CPU out of deep C
sleep states and hence reduces battery life. Can this be fixed?
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-consumption/+bug/934117/+subscriptions
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