On Mon, 2007-11-12 at 10:14 +0800, Zhang, Yanmin wrote: > > Subject: mm: speed up writeback ramp-up on clean systems > > I tested kernel 2.6.23, 2,6,24-rc2, 2.6.24-rc2_peter(2.6.24-rc2+this patch). > > 1) Compare among first/second/following running > 2.6.23: second run of iozone will get about 28% improvement than first run. > Following run is very stable like 2nd run. > 2.6.24-rc2: second run of iozone will get about 170% improvement than first run. 3rd run > will get about 80% improvement than 2nd. Following run is very stable like 3rd run. > 2.6.24-rc2_peter: second run of iozone will get about 14% improvement than first run. Following > run is mostly stable like 2nd run. > So the new patch really improves the first run result. Comparing wiht 2.6.24-rc2, 2.6.24-rc2_peter > has 330% improvement on the first run. > > 2) Compare among different kernels(based on the stable highest result): > 2.6.24-rc2 has about 50% regression than 2.6.23. > 2.6.24-rc2_peter has the same result like 2.6.24-rc2. > > From this point of view, above patch has no improvement. :) Drad, still good test results though. Could you describe you system in detail, that is, you have 8GB of memory and 8 cpus (2*quad?). How many disks does it have and are those aggregated using md or dm? What filesystem do you use?
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