On Mon, 9 Apr 2007, Andrew Morton wrote: > On Mon, 9 Apr 2007 11:25:09 -0700 (PDT) > Christoph Lameter <[EMAIL PROTECTED]> wrote: > > > On x86_64 this cuts allocation overhead for page table pages down to > > a fraction (kernel compile / editing load. TSC based measurement > > of times spend in each function): > > > > no quicklist > > > > pte_alloc 1569048 4.3s(401ns/2.7us/179.7us) > > pmd_alloc 780988 2.1s(337ns/2.7us/86.1us) > > pud_alloc 780072 2.2s(424ns/2.8us/300.6us) > > pgd_alloc 260022 1s(920ns/4us/263.1us) > > > > quicklist: > > > > pte_alloc 452436 573.4ms(8ns/1.3us/121.1us) > > pmd_alloc 196204 174.5ms(7ns/889ns/46.1us) > > pud_alloc 195688 172.4ms(7ns/881ns/151.3us) > > pgd_alloc 65228 9.8ms(8ns/150ns/6.1us) > > > > pgd allocations are the most complex and there we see the most dramatic > > improvement (may be we can cut down the amount of pgds cached somewhat?). > > But even the pte allocations still see a doubling of performance. > > Was there any observeable change in overall runtime?
The kernel compile times fluctuates as usual. There was a tendency for the times to be less but no clear win as discussed before. > What are the numbers in parentheses? (minimum/average/maximum) - 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/
