4 messages, 3 authors, 2002-05-02 · open the first message on its own page
From: Holger Bettag <hidden>
Date: 2002-05-02 13:11:51
Benjamin Herrenschmidt [off-list ref] writes:
No. Doing SMP with G3s is a terrible nightmare as those CPUs don't have the necessary coherency protocols.
Is MEI not enough for Linux? Instruction cache coherency problems? Or is it because of the rudimentary implementation of tlbie/tlbia? Just curious. Holger ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2002-05-02 13:14:39
quoted
No. Doing SMP with G3s is a terrible nightmare as those CPUs don't have the necessary coherency protocols.Is MEI not enough for Linux? Instruction cache coherency problems? Or is it because of the rudimentary implementation of tlbie/tlbia? Just curious.
I don't have all in mind, from memory, the lack of bus broadcast for tlbie is one, the lack of bus coherency for cache inval is another, but I am not sure. I think in the past, we used to have BeBox (dual 603) working, which I suppose is pretty similar, but still hell. No way I support that for pmac kernels. Ben. ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
From: Robert E Brose II <hidden>
Date: 2002-05-02 15:34:58
User Benjamin Herrenschmidt says:
quoted
quoted
No. Doing SMP with G3s is a terrible nightmare as those CPUs don't have the necessary coherency protocols.Is MEI not enough for Linux? Instruction cache coherency problems? Or is it because of the rudimentary implementation of tlbie/tlbia? Just curious.I don't have all in mind, from memory, the lack of bus broadcast for tlbie is one, the lack of bus coherency for cache inval is another, but I am not sure. I think in the past, we used to have BeBox (dual 603) working, which I suppose is pretty similar, but still hell. No way I support that for pmac kernels. Ben.
I assume then that the 604e has what's needed because IBM has RS6ks with multiples of these?? Bob -- /~\ The ASCII | Robert E. Brose II N0QBJ \ / Ribbon Campaign | http://www.qbjnet.com/ X Help cure | mailto:bob@qbjnet.com / \ HTML Email | public key at http://www.qbjnet.com/key.html ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2002-05-02 16:46:08
I assume then that the 604e has what's needed because IBM has RS6ks with multiples of these??
Yes, and G4 as well. Ben. ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/