I get up to and over 9% CPU usage when I've no sound playing application
open - but I was playing sounds previously. Using perf, it appeared most
CPU time being spent in kernel. strace gave me this output repeated
continually:
ppoll([{fd=5, events=POLLIN}, {fd=22, events=POLLIN|POLLOUT}, {fd=49,
events=POLLIN}, {fd=50, events=POLLIN}, {fd=48, events=POLLIN}, {fd=47,
events=POLLIN}, {fd=10, events=POLLIN}, {fd=40, events=POLLIN}, {fd=35,
events=POLLIN}, {fd=4, events=POLLIN}, {fd=42, events=POLLIN}, {fd=18,
events=POLLIN}, {fd=21, events=POLLIN}, {fd=39, events=POLLIN}, {fd=38,
events=POLLIN}, {fd=37, events=POLLIN}, {fd=36, events=POLLIN}, {fd=17,
events=POLLIN}, {fd=34, events=POLLIN}, {fd=33, events=POLLIN}, {fd=32,
events=POLLIN}, {fd=31, events=POLLIN|POLLERR|POLLHUP}, {fd=31, events=0},
{fd=25, events=POLLIN}, {fd=28, events=POLLIN}, {fd=16,
events=POLLIN|POLLERR|POLLHUP}, {fd=16, events=0}, {fd=15, events=POLLIN},
{fd=14, events=POLLIN}, {fd=8, events=POLLIN}, {fd=7, events=POLLIN}], 31,
NULL, NULL, 8) = 1 ([{fd=22, revents=POLLIN|POLLOUT}])
write(6, "W", 1) = 1
recvmsg(22, {msg_name(0)=NULL,
msg_iov(1)=[{"\0\0\0\20\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0", 20}],
msg_controllen=32, {cmsg_len=28, cmsg_level=SOL_SOCKET,
cmsg_type=SCM_CREDENTIALS{pid=3937, uid=1000, gid=1000}}, msg_flags=0}, 0) = 20
write(6, "W", 1) = 1
sendto(22,
"\0\0\0\30\377\377\377\377\0\0\0\0\0\0\0\0\0\0\0\0L\0\0\0?L\377\377\377\377L\0"...,
44, MSG_NOSIGNAL, NULL, 0) = 44
write(6, "W", 1) = 1
read(5, "WWW", 10) = 3
ppoll([{fd=5, events=POLLIN}, {fd=22, events=POLLIN|POLLOUT}, {fd=49,
events=POLLIN}, {fd=50, events=POLLIN}, {fd=48, events=POLLIN}, {fd=47,
events=POLLIN}, {fd=10, events=POLLIN}, {fd=40, events=POLLIN}, {fd=35,
events=POLLIN}, {fd=4, events=POLLIN}, {fd=42, events=POLLIN}, {fd=18,
events=POLLIN}, {fd=21, events=POLLIN}, {fd=39, events=POLLIN}, {fd=38,
events=POLLIN}, {fd=37, events=POLLIN}, {fd=36, events=POLLIN}, {fd=17,
events=POLLIN}, {fd=34, events=POLLIN}, {fd=33, events=POLLIN}, {fd=32,
events=POLLIN}, {fd=31, events=POLLIN|POLLERR|POLLHUP}, {fd=31, events=0},
{fd=25, events=POLLIN}, {fd=28, events=POLLIN}, {fd=16,
events=POLLIN|POLLERR|POLLHUP}, {fd=16, events=0}, {fd=15, events=POLLIN},
{fd=14, events=POLLIN}, {fd=8, events=POLLIN}, {fd=7, events=POLLIN}], 31,
NULL, NULL, 8) = 1 ([{fd=22, revents=POLLIN|POLLOUT}])
write(6, "W", 1) = 1
recvmsg(22, {msg_name(0)=NULL,
msg_iov(1)=[{"\0\0\0\33\3\1\312\204\0002\0(\0\0\4\250", 16}],
msg_controllen=32, {cmsg_len=28, cmsg_level=SOL_SOCKET,
cmsg_type=SCM_CREDENTIALS{pid=3937, uid=1000, gid=1000}}, msg_flags=0}, 0) = 16
write(6, "W", 1) = 1
sendto(19, "\1\0\0\0\0\0\0\0", 8, MSG_NOSIGNAL, NULL, 0) = -1 ENOTSOCK (Socket
operation on non-socket)
write(19, "\1\0\0\0\0\0\0\0", 8) = 8
sendto(22,
"\0\0\0\17\377\377\377\377\0\0\0\0\0\0\0\0\0\0\0\0L\0\0\0VL\377\377\377\377L\0"...,
35, MSG_NOSIGNAL, NULL, 0) = 35
write(6, "W", 1) = 1
read(5, "WWW", 10) = 3
What is PA continually polling??
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/786831
Title:
Pulseaudio uses 5% CPU when doing nothing
Status in “pulseaudio” package in Ubuntu:
Confirmed
Bug description:
Binary package hint: pulseaudio
Pulseaudio is using five-percent CPU, with no sound playing and the
inputs muted. This is eating the battery:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1601 sladen 20 0 175m 23m 21m S 5 0.8 3:11.78 pulseaudio
clock_gettime(CLOCK_MONOTONIC, {17605, 365566885}) = 0
ppoll([{fd=4, events=POLLIN}, {fd=39, events=POLLIN|POLLOUT}, {fd=40,
events=POLLIN}, {fd=38, events=POLLIN}, {fd=35, events=POLLIN}, {fd=21,
events=POLLIN}, {fd=9, events=POLLIN}, {fd=37, events=POLLIN}, {fd=36,
events=POLLIN}, {fd=27, events=POLLIN}, {fd=7, events=POLLIN}, {fd=20,
events=POLLIN}, {fd=26, events=POLLIN}, {fd=34, events=POLLIN}, {fd=33,
events=POLLIN}, {fd=32, events=POLLIN}, {fd=31, events=POLLIN}, {fd=30,
events=POLLIN}, {fd=29, events=POLLIN|POLLERR|POLLHUP}, {fd=29, events=0},
{fd=22, events=POLLIN}, {fd=25, events=POLLIN}, {fd=16, events=POLLIN}, {fd=19,
events=POLLIN}, {fd=15, events=POLLIN|POLLERR|POLLHUP}, {fd=15, events=0},
{fd=14, events=POLLIN}, {fd=13, events=POLLIN}, {fd=6, events=POLLIN}], 29, {3,
91527000}, NULL, 8) = 1 ([{fd=39, revents=POLLIN|POLLOUT}], left {3, 91511007})
clock_gettime(CLOCK_MONOTONIC, {17605, 367958597}) = 0
recvmsg(39, {msg_name(0)=NULL,
msg_iov(1)=[{"\0\0\0\20\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0", 20}],
msg_controllen=24, {cmsg_len=24, cmsg_level=SOL_SOCKET,
cmsg_type=SCM_CREDENTIALS{pid=12970, uid=1000, gid=1000}}, msg_flags=0}, 0) = 20
clock_gettime(CLOCK_MONOTONIC, {17605, 368566636}) = 0
ppoll([{fd=4, events=POLLIN}, {fd=39, events=POLLIN}, {fd=40, events=POLLIN},
{fd=38, events=POLLIN}, {fd=35, events=POLLIN}, {fd=21, events=POLLIN}, {fd=9,
events=POLLIN}, {fd=37, events=POLLIN}, {fd=36, events=POLLIN}, {fd=27,
events=POLLIN}, {fd=7, events=POLLIN}, {fd=20, events=POLLIN}, {fd=26,
events=POLLIN}, {fd=34, events=POLLIN}, {fd=33, events=POLLIN}, {fd=32,
events=POLLIN}, {fd=31, events=POLLIN}, {fd=30, events=POLLIN}, {fd=29,
events=POLLIN|POLLERR|POLLHUP}, {fd=29, events=0}, {fd=22, events=POLLIN},
{fd=25, events=POLLIN}, {fd=16, events=POLLIN}, {fd=19, events=POLLIN}, {fd=15,
events=POLLIN|POLLERR|POLLHUP}, {fd=15, events=0}, {fd=14, events=POLLIN},
{fd=13, events=POLLIN}, {fd=6, events=POLLIN}], 29, {3, 88527000}, NULL, 8) = 1
([{fd=39, revents=POLLIN}], left {3, 88512333})
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