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Fernando Luis =?ISO-8859-1?Q?V=E1zquez?= Cao (on Tue, 11 Jul 2006 13:21:01 +0900) wrote: >That is a good idea, but I have on concern. In mach-default by default >we use __send_IPI_shortcut (no_broadcast==0) instead of send_IPI_mask. >Is it always safe to ignore the no_broadcast setting? In other words, >can __send_IPI_shortcut be replaced by send_IPI_mask safely? It is always safe to use send_IPI_mask. It is not used by default because of concerns that send_IPI_mask may be slower than using a broadcast, although I do not know if anybody has measurements to back up that concern. OTOH I can guarantee that sending NMI as a broadcast has problems, it breaks some Dell Xeon servers[1]. My fix was to never broadcast NMI, from 2.6.18-rc1 NMI_VECTOR always uses a mask[2] and crash was changed accordingly[3]. [1] http://marc.theaimsgroup.com/?t=114828920800003&r=1&w=2 [2] http://marc.theaimsgroup.com/?t=115103727400006&r=1&w=2 [3] http://marc.theaimsgroup.com/?t=115096703800003&r=1&w=2 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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