[Asterisk-Users] te110p and interrupts

[Paul Hewlett]

On Monday 17 April 2006 12:39, Anton Krall wrote:
> I don't know if this only works with multiple cpus but I have HT enabled
> and it shows cpu0 and cpu1 .. I tried the first part of this email and
> still the kernel boots and shows 2 cpus.. Will this only work with 2 real
> cpus?

   I believe so. Hyperthreading is not really SMP. 

   Additionally I think that HT should not be used if asterisk is doing a lot 
of transcoding - whilst HT gives u 2 'pipes' there is still only one FPU and 
heavy transcoding will simply bottleneck at the FPU(NB SSE/MMX count as FP 
since they use the FP registers.). If u turn HT on, a 1% penalty is incurred 
fir the mutexes required so heavy use of the FPU will actually show a 
decrease in speed compared to no HT. In theory at least. :-)

Paul Hewlett
>
> |-----Original Message-----
> |From: asterisk-users-bounces at lists.digium.com
> |[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of
> |Begumisa Gerald M
> |Sent: Monday, April 17, 2006 5:13 AM
> |To: Asterisk Users Mailing List - Non-Commercial Discussion
> |Subject: Re: [Asterisk-Users] te110p and interrupts
> |
> |Hi Paul,
> |
> |Thanks for the message!
> |
> |      On Sun, 16 Apr 2006, Paul Hewlett wrote:
> |      [...]
> |
> |    >   I am curious..
> |    >
> |    >   Have you tried disabling CPU1 by setting isolcpus=1 on
> |
> |the kernel
> |
> |    > command line ?
> |    >
> |    >   This will make the kernel ignore the second CPU - you
> |
> |can then run
> |
> |    > asterisk on it by using the taskset command (from schedutils)
> |    >
> |    >      taskset 0x00000001 asterisk -p
> |    >
> |    > and asterisk wlll run on a CPU all on its own. I was about to try
> |    > this and wondered if you might give it a try and report back.
> |
> |I haven't done this yet. Once we have physical access to the
> |machine, I'll make sure we try this out and see what
> |difference it makes.
> |
> |
> |Cheers!
> |Gerald.
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