* Nathan Zimmer <nzimmer@xxxxxxx> wrote: > On Sun, Jun 23, 2013 at 11:28:40AM +0200, Ingo Molnar wrote: > > > > That's 4.5 GB/sec initialization speed - that feels a bit slow and the > > boot time effect should be felt on smaller 'a couple of gigabytes' > > desktop boxes as well. Do we know exactly where the 2 hours of boot > > time on a 32 TB system is spent? > > There are other several spots that could be improved on a large system > but memory initialization is by far the biggest. My feeling is that deferred/on-demand initialization triggered from the buddy allocator is the better long term solution. That will also make it much easier to profile/test memory init performance: boot up a large system and run a simple testprogram that allocates a lot of RAM. ( It will also make people want to optimize the initialization sequence better, as it will be part of any freshly booted system's memory allocation overhead. ) Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
