I'm in the process of replacing an old server with a new one and are making som changes in the infrastructure, the biggest change in my eyes is moving from i386 to AMD64 arch. Yesterday I began migrating some users from the old to the new server.
After only 57 concurrent calls in abount 13 conferences the sound are losing quality. The server uses dahdi 2.6.0 for timing but no dahdi hardware. dahdi_test gives results like this when the server is used like that: 100.000% 99.999% 99.994% 99.998% 99.999% 99.616% 99.614% 99.997% 99.998% 99.618% 99.615% 99.994% 99.987% 99.626% 99.628% 99.993% 99.626% 100.000% 100.000% 99.622% 99.999% 99.607% 99.604% 99.627% 99.621% 99.629% 99.627% 99.998% 99.622% 99.995% 99.621% 99.996% Results from dahdi_test with only some calls active: 99.999% 99.999% 99.990% 99.998% 99.999% 99.995% 99.995% 99.993% 99.997% 99.993% 99.999% 99.998% 99.996% 99.996% 99.998% 99.998% 99.991% 99.998% 99.995% 99.995% 99.987% 99.985% 99.996% 99.995% Looking at the cacti graphs the kernel uses 100% cpu (total 400% with 4 processor cores), when the problem above is present. Top does not show this kernel-cpu that cacti shows, but this maybe is by design? Asterisk is using about 15% cpu. top - 19:32:06 up 20:57, 1 user, load average: 0.00, 0.00, 0.00 Tasks: 213 total, 1 running, 212 sleeping, 0 stopped, 0 zombie Cpu(s): 7.4%us, 29.6%sy, 0.0%ni, 55.3%id, 0.0%wa, 0.0%hi, 7.7%si, 0.0%st Mem: 12299332k total, 3967800k used, 8331532k free, 251432k buffers Swap: 19529720k total, 0k used, 19529720k free, 2919456k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 30666 root 0 -20 539m 25m 6600 S 15 0.2 6:55.01 asterisk 738 root 20 0 19184 1444 1004 R 1 0.0 0:00.08 top The old server (i386 Debian 5: Linux 2.6.26-2-openvz-686) can have 320 calls in conferences without this problem. The new server (amd64 Debian 6: Linux 2.6.32-5-openvz-amd64) show these problems after 50 calls.. Old server: Hp dl360g5, 4 cpu Xeon E5420, 2.50GHz run i386 with PAE and OpenVZ, Debian Lenny uses the broadcom nic's on the motherboard asterisk 1.4.42 in openvz container (uses /dev/dahdi for timing) cacti shows cpu in kernel mode 80% with 320 active calls in conferences New server: Hp dl360g7, 4 cpu Xeon E5520, 2.27GHz run amd63 with OpenVZ, Debian Squeeze uses Intel nic's 82571EB for offloading the processor + nic bonding in the kernel for failover. asterisk 1.4.42 in openvz container (uses /dev/dahdi for timing) cacti show cpu in kernel mod 100% with 57 active calls in conferences This is a puzzle to me.. - Does anyone have experience with amd64 arch and dahdi for timing? - Can Dahdi om amd64 be responsible for the high cpu in kernel mode? - I have a spare Digium TE220, would it offload the server to use it as a timing source only? - How do I debug the high cpu usage by the kernel, can I break this down by module in some way? Many, many thanks! -- Johan Wilfer email: [email protected] JT Tech | Developer webb: http://jttech.se -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
