[Asterisk-Users] Dual T400P, SMP, performance issues

[Alex Zarubin]

Hi, 

We are trying to validate Asterisk as a media gateway PRI <-> SIP with two
T400P (8 T1s) per box. The first
experience with BOX1 (Compaq, 2.53 GHz, 1 Gb RAM) and just one T400P was
encouraging - on the load
test with 3 T1s worth of calls we had on average 75% idle CPU.

Not so with BOX2 (Dell, single 2.6 GHz Xeon, 1 Gb RAM, 2 T400P) and BOX3
(Dell, dual 2.6 GHz Xeon,
2 Gb RAM, 2 T400P, asterisk/zaptel is built with SMP support).

On the similar load test (as with the BOX1) BOX2 was showing 0% idle CPU 70%
of the time. Just 3 T1s
out of 8.

On the load test with just 2 T1s BOX3 was very close to 0% idle on CPU0,
CPU1 was at 95% idle.
The process ksoftirqd_CPU0 was close to the top of the 'top', with
/proc/interrupts showing tor2 related
numbers growing very fast. We had 2 T1s plugged into the first T400P board,
with nothing going into the second,
but the number of interrupts for the both boards was growing at the same
pace. Here are the interrupts
(after the box reboot, so they are not that big as they were) - do they look
OK?


            CPU0       CPU1       CPU2       CPU3       
  0:     122556          0          0          0    IO-APIC-edge  timer
  1:          4          0          0          0    IO-APIC-edge  keyboard
  2:          0          0          0          0          XT-PIC  cascade
  5:          0          0          0          0   IO-APIC-level  usb-ohci
  8:          1          0          0          0    IO-APIC-edge  rtc
 12:         20          0          0          0    IO-APIC-edge  PS/2 Mouse
 14:         23          0          2          0    IO-APIC-edge  ide0
 20:     516930          0          0          0   IO-APIC-level  tor2
 24:     516524          0          0          0   IO-APIC-level  tor2
 28:      10600          0          0          0   IO-APIC-level  eth0
 29:       4837          0          0          0   IO-APIC-level  eth1
 30:      24831          0          0          0   IO-APIC-level  aacraid
NMI:          0          0          0          0 
LOC:     122430     122429     122429     122428 
ERR:          0
MIS:          0

Not sure what went wrong. Any suggestions on how to work with 2 T400P in a
box (without hurting performance)
and how to get advantage of SMP for Asterisk would be appreciated.

Any known Linux kernel related issues (2.4.20-13.7smp #1 SMP for BOX3 )?

Thank you.

Alex Zarubin


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