Messages in this thread | | | Subject | Re: [tbench regression fixes]: digging out smelly deadmen. | From | Mike Galbraith <> | Date | Mon, 27 Oct 2008 10:29:17 +0100 |
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On Sun, 2008-10-26 at 20:03 +0100, Jiri Kosina wrote: > On Sun, 26 Oct 2008, Andrew Morton wrote: > > > > > > 208.4 MB/sec -- vanilla 2.6.16.60 > > > > > 201.6 MB/sec -- vanilla 2.6.20.1 > > > > > 172.9 MB/sec -- vanilla 2.6.22.19 > > > > > 74.2 MB/sec -- vanilla 2.6.23 > > > > > 46.1 MB/sec -- vanilla 2.6.24.2 > > > > > 30.6 MB/sec -- vanilla 2.6.26.1 > > > > > I.e. huge drop for 2.6.23 (this was with default configs for each > > > > > respective kernel). > > Was this when we decreased the default value of > > /proc/sys/vm/dirty_ratio, perhaps? dbench is sensitive to that. > > 2.6.28 gives 41.8 MB/s with /proc/sys/vm/dirty_ratio == 50. So small > improvement, but still far far away from the throughput of pre-2.6.23 > kernels.
How many clients?
dbench 160 -t 60
2.6.28-smp (git.today) Throughput 331.718 MB/sec 160 procs (no logjam) Throughput 309.85 MB/sec 160 procs (contains logjam) Throughput 392.746 MB/sec 160 procs (contains logjam)
-Mike
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