On Thursday 01 February 2007 12:46, Ingo Molnar wrote: > > * [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > > Inter-CPU monotonicity can not, however, be guaranteed in a vsyscall, > > so vsyscall is not used by default. [...] > > note that this is not actually the case. My patch below, ontop of -mm, > implements a fully monotonic gettimeofday as an optional vsyscall > feature. > > The 'price' paid for it is lower resolution - but it's still good for > those benchmarking TPC-C runs - and /alot/ simpler.
BTW another comment: I was told that at least one of the big databases wants ms resolution here. So to make your scheme work would require a HZ=1024 regular interrupt. But that would also make everything slower again due to CPU overhead as it was learned in the 2.4->2.6 HZ transition. So it might not actually be worth it. -Andi - 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/
