Re: [PATCH v8 00/10] qspinlock: a 4-byte queue spinlock with PV support

[Raghavendra K T]

On 04/09/2014 12:45 AM, Waiman Long wrote:
> Yes, I am able to reproduce the hang problem with ebizzy. BTW, could you
> try to apply the attached patch file on top of the v8 patch series to
> see if it can fix the hang problem?

Ran the benchmarks with the fix and I am not seeing hang so far.
ebizzy improvements.

0.5x  2.7345
1x   -10.6593
1.5x  35.6962
2x    88.0461

dbench improvements
0.5x   3.2428
1x     1.1514
1.5x   5.5071
2x    23.8700
( I will have to restest on ebizzy 1x reression but overall performance
numbers look good).

> > Baseline was 3.14-rc8 without any of the qspin patch series.
>
> Does the baseline have PV ticketlock or without any PV support?

baseline had PV ticketlock enabled.

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