Comparing with 2.6.23, iozone sequential write/rewrite (512M) has 50% regression in kernel 2.6.24-rc1. 2.6.24-rc2 has the same regression.
My machine has 8 processor cores and 8GB memory. By bisect, I located patch http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=04fbfdc14e5f48463820d6b9807daa5e9c92c51f. Another behavior: with kernel 2.6.23, if I run iozone for many times after rebooting machine, the result looks stable. But with 2.6.24-rc1, the first run of iozone got a very small result and following run has 4Xorig_result. What I reported is the regression of 2nd/3rd run, because first run has bigger regression. I also tried to change /proc/sys/vm/dirty_ratio,dirty_backgroud_ratio and didn't get improvement. -yanmin - 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/