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SubjectRe: [regression, 3.15-rc1] vdso_gettimeofday hogs all my CPU
On Tue, Apr 15, 2014 at 05:53:36PM +1000, Dave Chinner wrote:
> Hi Peter,
>
> I'm guessing that x86 vdso problems are in your area of expertise,
> if not can you point me at the right person to bug?

And you can ignore it. The VM wasn't running the kernel I thought it
was - it was an old kernel from half way through last week. A
3.15-rc1 kernel, which I'm now testing, doesn't show the regression:

FSUse% Count Size Files/sec App Overhead
0 1600000 0 281779.0 9964735
0 3200000 0 280343.0 10174512
0 4800000 0 268615.2 11330160
0 6400000 0 264782.4 11072193
.....

It shows all sorts of interesting new inode cache reclaim imbalances,
but other than that the peak performance is back to normal...

Sorry for the noise.

Cheers,

Dave.
--
Dave Chinner
david@fromorbit.com


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