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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https://bugs.launchpad.net/bugs/786831
Title:
Pulseaudio uses 5% CPU when doing nothing
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