On Mon, Feb 11, 2008 at 09:15:55AM +0100, Mike Galbraith wrote: > Piddling around with your testcase, it still looks to me like things > improved considerably in latest greatest git. Hopefully that means > happiness is in the pipe for the real workload... synthetic load is > definitely happier here as burst is shortened.
The real workload doesn't see much of an improvement. The changes I did when tinkering yesterday seem like they're better at modelling just what's going on with that one. I've added the new testcase I'm using for the numbers I posted last night at http://lixom.net/~olof/threadtest/new/, including numbers for the various kernels. I also included the binaries I built. (with "gcc -DLOOPS=<size> testcase.c -lpthread"). I tried graphing the numbers as well, it looks like for larger workloads that 2.6.22 has a fixed benefit over newer kernels. I.e. it seems quicker at rebalancing, but once things balance out they're obviously doing ok independent of kernel version. Graph at http://lixom.net/olof/threadtest/new/schedgraph.pdf. I couldn't figure out how to make the X axis linear, so it obviously looks odd with the current powers-of-two at the end instead of linear, but the differences can still be seen clearly. -Olof -- 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/