Public bug reported:
avahi-daemon on a network with many clients is doing poll() with a zero
timeout and timing out immediately. This looks like a busy wait to me.
poll([{fd=6, events=POLLIN}, {fd=17, events=POLLIN}, {fd=16, events=POLLIN},
{fd=15, events=POLLIN}, {fd=14, events=POLLIN}, {fd=13, events=POLLIN}, {fd=12,
events=POLLIN}, {fd=11, events=POLLIN}, {fd=10, events=POLLIN}, {fd=8,
events=POLLIN}], 10, 0) = 0 (Timeout)
write(7, "W", 1) = 1
write(7, "W", 1) = 1
read(6, "WW", 10) = 2
poll([{fd=6, events=POLLIN}, {fd=17, events=POLLIN}, {fd=16, events=POLLIN},
{fd=15, events=POLLIN}, {fd=14, events=POLLIN}, {fd=13, events=POLLIN}, {fd=12,
events=POLLIN}, {fd=11, events=POLLIN}, {fd=10, events=POLLIN}, {fd=8,
events=POLLIN}], 10, 0) = 0 (Timeout)
write(7, "W", 1) = 1
write(7, "W", 1) = 1
read(6, "WW", 10) = 2
poll([{fd=6, events=POLLIN}, {fd=17, events=POLLIN}, {fd=16, events=POLLIN},
{fd=15, events=POLLIN}, {fd=14, events=POLLIN}, {fd=13, events=POLLIN}, {fd=12,
events=POLLIN}, {fd=11, events=POLLIN}, {fd=10, events=POLLIN}, {fd=8,
events=POLLIN}], 10, 0) = 0 (Timeout)
write(7, "W", 1) = 1
write(7, "W", 1) = 1
read(6, "WW", 10) = 2
poll([{fd=6, events=POLLIN}, {fd=17, events=POLLIN}, {fd=16, events=POLLIN},
{fd=15, events=POLLIN}, {fd=14, events=POLLIN}, {fd=13, events=POLLIN}, {fd=12,
events=POLLIN}, {fd=11, events=POLLIN}, {fd=10, events=POLLIN}, {fd=8,
events=POLLIN}], 10, 0) = 0 (Timeout)
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: battery-power-consumption
** Tags added: battery-power-consumption
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https://bugs.launchpad.net/bugs/915261
Title:
avahi-daemon: polling with zero timeout
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