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[Paul <1242229@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

unity-panel-service sits at between 3% and 5% of one core, all the time.
That's up to 50 MIPS! What's it doing?

Only standard indicators used, and most Unity lenses and scopes not
installed. Internet access is available and unfiltered. Standard Intel
Mobile 4 GPU.

When I set the datetime indicator to show seconds, unity-panel-service
uses an additional 1% of CPU. That's 10 million instructions each time
the clock ticks!

Sample strace output (most of it looks like this, repeated over and over
again, once per second):

futex(0x7fad2800f2b0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7fad2800eac0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7fad28004110, FUTEX_WAKE_PRIVATE, 1) = 1
recvfrom(3, 0x25896f4, 4096, 0, 0, 0)   = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 481) = 1 ([{fd=4, revents=POLLIN}])
write(7, "\1\0\0\0\0\0\0\0", 8)         = 8
futex(0x7fad2800f2b0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7fad2800eac0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7fad28004110, FUTEX_WAKE_PRIVATE, 1) = 1
recvfrom(3, 0x25896f4, 4096, 0, 0, 0)   = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 478) = 1 ([{fd=4, revents=POLLIN}])
read(4, "\1\0\0\0\0\0\0\0", 16)         = 8
recvfrom(3, 0x25896f4, 4096, 0, 0, 0)   = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 478) = 0 (Timeout)
read(4, 0x7fff81ade700, 16)             = -1 EAGAIN (Resource temporarily unavailable)
recvfrom(3, 0x25896f4, 4096, 0, 0, 0)   = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 962) = 1 ([{fd=4, revents=POLLIN}])
recvfrom(3, 0x25896f4, 4096, 0, 0, 0)   = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 80) = 1 ([{fd=4, revents=POLLIN}])
read(4, "\1\0\0\0\0\0\0\0", 16)         = 8
recvfrom(3, 0x25896f4, 4096, 0, 0, 0)   = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 80) = 0 (Timeout)
read(4, 0x7fff81ade700, 16)             = -1 EAGAIN (Resource temporarily unavailable)
write(7, "\1\0\0\0\0\0\0\0", 8)         = 8

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1242229

Title:
  unity-panel-service uses 3% to 5% of one CPU core all the time

Status in “unity” package in Ubuntu:
  New

Bug description:
  unity-panel-service sits at between 3% and 5% of one core, all the
  time. That's up to 50 MIPS! What's it doing?

  Only standard indicators used, and most Unity lenses and scopes not
  installed. Internet access is available and unfiltered. Standard Intel
  Mobile 4 GPU.

  When I set the datetime indicator to show seconds, unity-panel-service
  uses an additional 1% of CPU. That's 10 million instructions each time
  the clock ticks!

  Sample strace output (most of it looks like this, repeated over and
  over again, once per second):

  futex(0x7fad2800f2b0, FUTEX_WAKE_PRIVATE, 1) = 1
  futex(0x7fad2800eac0, FUTEX_WAKE_PRIVATE, 1) = 1
  futex(0x7fad28004110, FUTEX_WAKE_PRIVATE, 1) = 1
  recvfrom(3, 0x25896f4, 4096, 0, 0, 0)   = -1 EAGAIN (Resource temporarily unavailable)
  poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 481) = 1 ([{fd=4, revents=POLLIN}])
  write(7, "\1\0\0\0\0\0\0\0", 8)         = 8
  futex(0x7fad2800f2b0, FUTEX_WAKE_PRIVATE, 1) = 1
  futex(0x7fad2800eac0, FUTEX_WAKE_PRIVATE, 1) = 1
  futex(0x7fad28004110, FUTEX_WAKE_PRIVATE, 1) = 1
  recvfrom(3, 0x25896f4, 4096, 0, 0, 0)   = -1 EAGAIN (Resource temporarily unavailable)
  poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 478) = 1 ([{fd=4, revents=POLLIN}])
  read(4, "\1\0\0\0\0\0\0\0", 16)         = 8
  recvfrom(3, 0x25896f4, 4096, 0, 0, 0)   = -1 EAGAIN (Resource temporarily unavailable)
  poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 478) = 0 (Timeout)
  read(4, 0x7fff81ade700, 16)             = -1 EAGAIN (Resource temporarily unavailable)
  recvfrom(3, 0x25896f4, 4096, 0, 0, 0)   = -1 EAGAIN (Resource temporarily unavailable)
  poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 962) = 1 ([{fd=4, revents=POLLIN}])
  recvfrom(3, 0x25896f4, 4096, 0, 0, 0)   = -1 EAGAIN (Resource temporarily unavailable)
  poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 80) = 1 ([{fd=4, revents=POLLIN}])
  read(4, "\1\0\0\0\0\0\0\0", 16)         = 8
  recvfrom(3, 0x25896f4, 4096, 0, 0, 0)   = -1 EAGAIN (Resource temporarily unavailable)
  poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 80) = 0 (Timeout)
  read(4, 0x7fff81ade700, 16)             = -1 EAGAIN (Resource temporarily unavailable)
  write(7, "\1\0\0\0\0\0\0\0", 8)         = 8

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