Question on SMP

Question on SMP

[Subrahmanya Sastry K V]

Hi,

I would like to run my iSCSI pseudo-HBA driver program on a
SMP machine. But my driver doesn't support SMP. Is there any
way by which I can disable all the processors but one in the
SMP machine dynamically and run my program, as if it is running
on a UP machine?

( Statically disabling the SMP support in the kernel config file
   and recompiling the kernel is one way. Any clues on
    how to achieve it dynamically?)

Regards,
Sastry

--
Subrahmanya Sastry K V
HCL Tech, Vadapalani, Chennai-26
Ph: +91-44-3728366  Xtn-1146
http://san.hcltech.com

Re: Question on SMP

[Randy.Dunlap]

On Thu, 11 Jul 2002, Subrahmanya Sastry K V wrote:

| I would like to run my iSCSI pseudo-HBA driver program on a
| SMP machine. But my driver doesn't support SMP. Is there any
| way by which I can disable all the processors but one in the
| SMP machine dynamically and run my program, as if it is running
| on a UP machine?
|
| ( Statically disabling the SMP support in the kernel config file
|    and recompiling the kernel is one way. Any clues on
|     how to achieve it dynamically?)

For what kernel version?

There are some patches to enable CPU hotswap on/off,
but they aren't integrated into any released kernel yet.
They are being changed very much, but should end up in Linux 2.5
fairly soon, but I don't really recommend using this just yet.
  http://sourceforge.net/projects/lhcs/

I don't know of any other dynamic CPU on/off tools.
For now, I think that you are better off with static
CPU control.

-- 
~Randy

Re: Question on SMP

[Bryan Henderson]

>( Statically disabling the SMP support in the kernel config file
>   and recompiling the kernel is one way. Any clues on
>    how to achieve it dynamically?)

A slightly more dynamic way is the kernel boot parameter maxcpus=1 .