Messages in this thread | | | Date | Sun, 26 Oct 2008 20:03:47 +0100 (CET) | From | Jiri Kosina <> | Subject | Re: [tbench regression fixes]: digging out smelly deadmen. |
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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.
-- Jiri Kosina SUSE Labs
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