Code:
..._newselect(1, [0], NULL, NULL, {0, 1}) = 0 (Timeout)recvfrom(9, 0x868c960, 49152, 0, 0xfffc3354, 0xfffc3350) = -1 EAGAIN (Resource temporarily unavailable)
nanosleep({4294967296000, -616050761403501304}, NULL) = 0
_newselect(1, [0], NULL, NULL, {0, 1}) = 0 (Timeout)
recvfrom(9, 0x868c960, 49152, 0, 0xfffc3354, 0xfffc3350) = -1 EAGAIN (Resource temporarily unavailable)
nanosleep({4294967296000, -616050761403501304}, NULL) = 0
_newselect(1, [0], NULL, NULL, {0, 1}) = 0 (Timeout)
recvfrom(9, 0x868c960, 49152, 0, 0xfffc3354, 0xfffc3350) = -1 EAGAIN (Resource temporarily unavailable)
nanosleep({4294967296000, -616050761403501304}, NULL) = 0
_newselect(1, [0], NULL, NULL, {0, 1}) = 0 (Timeout)
recvfrom(9, 0x868c960, 49152, 0, 0xfffc3354, 0xfffc3350) = -1 EAGAIN (Resource temporarily unavailable)
nanosleep({4294967296000, -616050761403501304}, NULL) = 0
_newselect(1, [0], NULL, NULL, {0, 1}) = 0 (Timeout)
recvfrom(9, 0x868c960, 49152, 0, 0xfffc3354, 0xfffc3350) = -1 EAGAIN (Resource temporarily unavailable)
nanosleep({4294967296000, -616050761403501304}, NULL) = 0
_newselect(1, [0], NULL, NULL, {0, 1}) = 0 (Timeout)
recvfrom(9, 0x868c960, 49152, 0, 0xfffc3354, 0xfffc3350) = -1 EAGAIN (Resource temporarily unavailable)
nanosleep({4294967296000, -616050761403501304}, NULL) = 0
_newselect(1, [0], NULL, NULL, {0, 1}) = 0 (Timeout)
recvfrom(9, 0x868c960, 49152, 0, 0xfffc3354, 0xfffc3350) = -1 EAGAIN (Resource temporarily unavailable)
_newselect(1, [0], NULL, NULL, {0, 1}) = 0 (Timeout)
recvfrom(9, 0x868c960, 49152, 0, 0xfffc3354, 0xfffc3350) = -1 EAGAIN (Resource temporarily unavailable)
nanosleep({4294967296000, -616050761403501304}, NULL) = 0
_newselect(1, [0], NULL, NULL, {0, 1}) = 0 (Timeout)
recvfrom(9, 0x868c960, 49152, 0, 0xfffc3354, 0xfffc3350) = -1 EAGAIN (Resource temporarily unavailable)
nanosleep({4294967296000, -616050761403501304}, NULL) = 0
_newselect(1, [0], NULL, NULL, {0, 1}) = 0 (Timeout)
recvfrom(9, 0x868c960, 49152, 0, 0xfffc3354, 0xfffc3350) = -1 EAGAIN (Resource temporarily unavailable)
nanosleep({4294967296000, -616050761403501304}, NULL) = 0
_newselect(1, [0], NULL, NULL, {0, 1}) = 0 (Timeout)
recvfrom(9, 0x868c960, 49152, 0, 0xfffc3354, 0xfffc3350) = -1 EAGAIN (Resource temporarily unavailable)
...
And from perf: