On Sunday 08 April 2007 00:06:13 Christoph Lameter wrote: > Results: > > x86_64 boot with virtual memmap > > Format: #events totaltime (min/avg/max) > > kfree_virt_to_page 598430 5.6ms(3ns/9ns/322ns) > > x86_64 boot regular sparsemem > > kfree_virt_to_page 596360 10.5ms(4ns/18ns/28.7us) > > > On average sparsemem virtual takes half the time than of sparsemem.
Nice. But on what workloads? Anyways it looks promising. I hope we can just replace old style sparsemem support with this for x86-64. > Time is measured using the cycle counter (TSC on IA32, ITC on IA64) which has > a very low latency. Sorry that triggered my usual RDTSC rant... Not on NetBurst (hundred of cycles) And on the others (C2,K8) it is a bit dangerous to measure short code blocks because RDTSC is not guaranteed ordered with the surrounding instructions. -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/
