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

[Alex Zarubin]

Zaptel was compiled with -D__SMP__

We've installed irqbalance and the picture improved a lot
(thanks to Jared Smith). Do you still see problems in our /proc/interrupts?

The big issue for us now is that after 24+ hours of the test load PRI->SIP
our Dell PE2650, dual 2.6 GHz Xeon, 2 Gb RAM, 2 T400P, 2.4.20-18.7smp #1 SMP
stops responding to anything.

So the questions are:
	- are there known issues with PE2650 and ways to fix them?
	- can someone recommend the 'stable' 2.4 SMP kernel for this
	  kind of load?
	- any expertise in this area will be appreciated

           CPU0       CPU1       CPU2       CPU3       
  0:     230710      30030      50050          0    IO-APIC-edge  timer
  1:          5          0          0        233    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
 14:         27          0          2          0    IO-APIC-edge  ide0
 20:    2085442     400221          0     230232   IO-APIC-level  tor2
 24:     293848    1841658      10010     570568   IO-APIC-level  tor2
 28:          5      25643          0          0   IO-APIC-level  eth0
 29:          5          0    5165040          0   IO-APIC-level  eth1
 30:      43720      35467       1291       3296   IO-APIC-level  aacraid
NMI:          0          0          0          0 
LOC:     310618     310616     310616     310616 
ERR:          0
MIS:          0

Thank you.
Alex Zarubin

-----Original Message-----
From: Martin Pycko [mailto:martinp at digium.com]
Sent: Tuesday, June 10, 2003 9:48 AM
To: 'asterisk-users at lists.digium.com'
Subject: Re: [Asterisk-Users] Dual T400P, SMP, performance issues


Are you sure that you compiled zaptel for __SMP__ ?
Edit your zaptel/Makefile.

  0:   75283844   75241320   75286285   75247088    IO-APIC-edge  timer
  1:          1          0          1          1    IO-APIC-edge  keyboard
  2:          0          0          0          0          XT-PIC  cascade
  3:          0          0          0          0   IO-APIC-level  usb-ohci
  8:          1          0          0          0    IO-APIC-edge  rtc
 15:          1          0          0          1    IO-APIC-edge  ide1
 16:   22134870   22120997   22135905   22122829   IO-APIC-level  eth0
 25:       4670       4548       4614       4518   IO-APIC-level  tor2

All the four CPU's should have IRQ's like in the example above.

Martin

On Mon, 9 Jun 2003, Alex Zarubin wrote:

> 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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