Fw: SMP Support

Fw: SMP Support

[Naushit Sakarvadia]

Hello,

I was wondering if there is SMP support  for TWO Processors
in Powerpc based Embedded Sytem.

I have 2  MPC755 Processors  sharing one 60x Bus.
Both of  them have 1MB of L2 Cache, and Share DRAM connected to 60x bus.


Have anybody already used powerpc SMP??
Have anybody used M-system Disk-on-Chip 2000 with PowerPC linux?
How about Powerspan PCI bridge support??


Thanks for any pointers

Naushit.


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Re: Fw: SMP Support

[Cort Dougan]

There are some tricks for the 750 on SMP that no-one has actually tried
yet.  I did some early work with it that ended up with horrible
performance.  The 750's don't broadcast TLB invalidates and that really
messes SMP up for us.

I'm not sure of the 755 follows in this tradition but I'd suggest checking
carefully for that.  SMP works well on anything other than 750's, though.

} I was wondering if there is SMP support  for TWO Processors
} in Powerpc based Embedded Sytem.
}
} I have 2  MPC755 Processors  sharing one 60x Bus.
} Both of  them have 1MB of L2 Cache, and Share DRAM connected to 60x bus.
}
}
} Have anybody already used powerpc SMP??
} Have anybody used M-system Disk-on-Chip 2000 with PowerPC linux?
} How about Powerspan PCI bridge support??
}
}
} Thanks for any pointers
}
} Naushit.
}
}

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

Re: Fw: SMP Support

[Naushit Sakarvadia]

Cort,

Thanks ,
I will definately look into issue of  broadcast TLB invalidate with 755.
But  I want to know  How do the let the Kernel know that there is
another processor sitting on the 60x Bus?

I never worked on SMP based system...I just want to know where to start??

Thanks
Naushit.



> There are some tricks for the 750 on SMP that no-one has actually tried
> yet.  I did some early work with it that ended up with horrible
> performance.  The 750's don't broadcast TLB invalidates and that really
> messes SMP up for us.
>
> I'm not sure of the 755 follows in this tradition but I'd suggest checking
> carefully for that.  SMP works well on anything other than 750's, though.
>
> } I was wondering if there is SMP support  for TWO Processors
> } in Powerpc based Embedded Sytem.
> }
> } I have 2  MPC755 Processors  sharing one 60x Bus.
> } Both of  them have 1MB of L2 Cache, and Share DRAM connected to 60x bus.
> }
> }
> } Have anybody already used powerpc SMP??
> } Have anybody used M-system Disk-on-Chip 2000 with PowerPC linux?
> } How about Powerspan PCI bridge support??
> }
> }
> } Thanks for any pointers
> }
> } Naushit.
> }
> }


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