Messages in this thread | | | Subject | Re: [tbench regression fixes]: digging out smelly deadmen. | From | Mike Galbraith <> | Date | Sun, 26 Oct 2008 11:23:19 +0100 |
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On Sun, 2008-10-26 at 02:11 -0700, Andrew Morton wrote:
> Was this when we decreased the default value of > /proc/sys/vm/dirty_ratio, perhaps? dbench is sensitive to that.
Wow, indeed. I fired up an ext2 disk to take kjournald out of the picture (dunno, just a transient thought). Stock settings produced three perma-wrecks in a row. With it bumped to 50, three very considerably nicer results in a row appeared.
2.6.26.7-smp dirty_ratio = 10 (stock) Throughput 36.3649 MB/sec 160 procs Throughput 47.0787 MB/sec 160 procs Throughput 88.2055 MB/sec 160 procs
2.6.26.7-smp dirty_ratio = 50 Throughput 1009.98 MB/sec 160 procs Throughput 1101.57 MB/sec 160 procs Throughput 943.205 MB/sec 160 procs -Mike
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