[PATCH v2 00/17] arm64 kernel text replication

[Russell King (Oracle)]

On Tue, Jan 30, 2024 at 10:16:13AM +0000, Xiong Yining wrote:
> Hi, Russell
> 
> >
> > Needless to say, the performance results from kernel text replication
> > are workload specific, but appear to show a gain of between 6% and 
> > 17% for database-centric like workloads. When combined with userspace
> > awareness of NUMA, this can result in a gain of over 50%.
> >
> 
> Tested-off-by: Xiong Yining <xiongyining1480 at phytium.com.cn>
> Tested-off-by: Yuquan Wang <wangyuquan1236 at phytium.com.cn>
> 
> Sorry for disturbing. This time I have applyed this patch on a real NUMA machine 
> through "-ktext=1" linux options and successfully booted. With a database-centric 
> performance test, it shows the patch will provide some improvement near 10%. However, 
> since I am unfamiliar with numa performace test, could you support more details or 
> suggestions on how to get the "gain of over 50%"?

You need to profile the system, and work out where the performance
bottlenecks are, and come up with ideas to address those bottlenecks.

Kernel text replication does not give arbitary guarantees of
improvement, so pulling figures of "gain of over 50%" is a complete
misrepresentation - it's highly workload and platform specific.

-- 
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