On Sun, Feb 17, 2008 at 06:56:56PM -0200, Glauber Costa wrote: >On Feb 17, 2008 4:05 PM, Ingo Molnar <[EMAIL PROTECTED]> wrote: >> >> * Glauber Costa <[EMAIL PROTECTED]> wrote: >> >> > config X86_VSMP >> > bool "Support for ScaleMP vSMP" >> > depends on X86_64 && PCI >> > - help >> > + select PARAVIRT >> > + help >> >> hm, what's the idea here? > >guys from scalemp can probably give a better picture if needed, >but in a nutshell, there are two aspects involved with the vsmp >support. The first one >is special L1 alignments, and the second, specialized irq handling routines. > >Only the second one is paravirt in itself, and are the ones addressed >in this patch. >The specialized routines now goes through paravirt ops. So when using >a vsmp machine, >paravirt has to be selected, in order to enable such functions.
Thanks Glauber. Well put. That said, future revs of vSMP will have the ability to work optimally even without the paravirtualized irq ops. This is an upcoming feature, and did not exist when we tested the paravirt ops 2-3 months ago. So, it will be better, now, not to select PARAVIRT while selecting X86_VSMP. Then, CONFIG_VSMP will just select the cacheline padding to be used and PARAVIRT will be needed if irq operations need to be paravirtualized. I shall submit a patch to that effect. Thanks, Kiran -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
