Date: Sun, 1 Nov 2015 03:25:46 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: Adrian Chadd <adrian@freebsd.org> Cc: "freebsd-mips@freebsd.org" <freebsd-mips@freebsd.org> Subject: Re: CPU underload Message-ID: <563523CA.3040207@grosbein.net> In-Reply-To: <CAJ-VmomLen5p7ELejU7QtC5CO2j8hydb_CvdOqQsfaaMAtmdkA@mail.gmail.com> References: <56348063.3090508@grosbein.net> <56348239.3050701@grosbein.net> <CAJ-Vmok%2BgKXcpzpxNCBhxX8sYSh%2BQO7OaeojB4MCufO%2BA4zceg@mail.gmail.com> <563500FC.8020201@grosbein.net> <CAJ-Vmo=EpmG6OJxq_v_mqKMF48h_B3K7vKqnnaKAi3x1s-uaWQ@mail.gmail.com> <5635148B.2070307@grosbein.net> <CAJ-VmomzkG8ZB0h1Qc=Oeny2ZOzQg1UirUprM_gmMy64F5ZRYw@mail.gmail.com> <56351AA6.80903@grosbein.net> <CAJ-VmomLen5p7ELejU7QtC5CO2j8hydb_CvdOqQsfaaMAtmdkA@mail.gmail.com>
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On 01.11.2015 03:10, Adrian Chadd wrote: > Hm, okay. Try doing ping -i 0.01 (ie, every 10ms.) I wonder if it's > happening more frequently and we're hitting sampling bias. Now without HWPMC_MIPS_BACKTRACE and with full CPU load it started dropping packets under load, both with "-i 0.1" and "-i 0.01": # ping -c 450 -s 1472 -i 0.1 192.168.3.1 [skip] 450 packets transmitted, 425 packets received, 5.6% packet loss round-trip min/avg/max/stddev = 0.285/0.715/7.184/0.383 ms # ping -c 4500 -s 1472 -i 0.01 192.168.3.1 [skip] 4500 packets transmitted, 4284 packets received, 4.8% packet loss round-trip min/avg/max/stddev = 0.238/0.725/7.677/0.389 ms In the latter case: # grep -v 'time=[01]' log PING 192.168.3.1 (192.168.3.1): 1472 data bytes 1480 bytes from 192.168.3.1: icmp_seq=5 ttl=64 time=7.017 ms 1480 bytes from 192.168.3.1: icmp_seq=101 ttl=64 time=6.517 ms 1480 bytes from 192.168.3.1: icmp_seq=490 ttl=64 time=2.121 ms 1480 bytes from 192.168.3.1: icmp_seq=684 ttl=64 time=2.640 ms 1480 bytes from 192.168.3.1: icmp_seq=1165 ttl=64 time=2.987 ms 1480 bytes from 192.168.3.1: icmp_seq=1453 ttl=64 time=6.688 ms 1480 bytes from 192.168.3.1: icmp_seq=2419 ttl=64 time=2.769 ms 1480 bytes from 192.168.3.1: icmp_seq=2515 ttl=64 time=4.655 ms 1480 bytes from 192.168.3.1: icmp_seq=2612 ttl=64 time=4.706 ms 1480 bytes from 192.168.3.1: icmp_seq=2902 ttl=64 time=7.677 ms 1480 bytes from 192.168.3.1: icmp_seq=2998 ttl=64 time=7.548 ms 1480 bytes from 192.168.3.1: icmp_seq=3095 ttl=64 time=3.359 ms 1480 bytes from 192.168.3.1: icmp_seq=3191 ttl=64 time=5.047 ms 1480 bytes from 192.168.3.1: icmp_seq=3483 ttl=64 time=7.278 ms 1480 bytes from 192.168.3.1: icmp_seq=3579 ttl=64 time=7.192 ms 1480 bytes from 192.168.3.1: icmp_seq=3870 ttl=64 time=6.866 ms 1480 bytes from 192.168.3.1: icmp_seq=3967 ttl=64 time=4.824 ms 1480 bytes from 192.168.3.1: icmp_seq=4063 ttl=64 time=4.385 ms 1480 bytes from 192.168.3.1: icmp_seq=4352 ttl=64 time=7.525 ms 1480 bytes from 192.168.3.1: icmp_seq=4450 ttl=64 time=2.993 ms --- 192.168.3.1 ping statistics --- 4500 packets transmitted, 4284 packets received, 4.8% packet loss round-trip min/avg/max/stddev = 0.238/0.725/7.677/0.389 ms
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