Andrew, From: Andrew Morton <[EMAIL PROTECTED]> > Andi Kleen <[EMAIL PROTECTED]> wrote: > > > > On Friday 02 September 2005 04:08, Andrew Morton wrote: > > > > > I suppose I'll queue it up in -mm for a while, although I'm a bit dubious > > > about the whole idea... We'll gain some and we'll lose some - how do we > > > know it's a net gain? > > > > I suspect it'll gain more than it loses. The only case where it might > > not gain is immediately someone reading the data from the page cache again > > after the write. > > That's a pretty common case - temporary files. > > > But I suppose that's far less frequent than writing the data. > > yup. > > Hiro, could you please send through a summary of the performance testing > results sometime? Runtimes rather than oprofile output?
iozone results are original 2.6.12.4 CPU time = 207.768 sec cache aware CPU time = 184.783 sec (three times run) 184.783/207.768=88.94% (11.06% reduction) original: pattern9-0-cpu4-0-08191720/iozone.out: CPU Utilization: Wall time 45.997 CPU time 64.527 CPU utilization 140.28 % pattern9-0-cpu4-0-08191741/iozone.out: CPU Utilization: Wall time 46.878 CPU time 71.933 CPU utilization 153.45 % pattern9-0-cpu4-0-08191743/iozone.out: CPU Utilization: Wall time 45.152 CPU time 71.308 CPU utilization 157.93 % cache awre: pattern9-0-cpu4-0-09011728/iozone.out: CPU Utilization: Wall time 44.842 CPU time 62.465 CPU utilization 139.30 % pattern9-0-cpu4-0-09011731/iozone.out: CPU Utilization: Wall time 44.718 CPU time 59.273 CPU utilization 132.55 % pattern9-0-cpu4-0-09011744/iozone.out: CPU Utilization: Wall time 44.367 CPU time 63.045 CPU utilization 142.10 % Regards, Hiro - 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/
