Re: [Qemu-devel] [RFC v1 01/11] tcg: move tb_find_fast outside the tb_lock critical section

[Paolo Bonzini]

On 22/03/2016 00:59, Emilio G. Cota wrote:
> Good point. Most of my tests have been on x86-on-x86, and the
> difference there (for many CPU-intensive benchmarks such as SPEC) was
> negligible.
> 
> Just tested the current master booting Alex' debian ARM image, without
> LRU, and I see a 20% increase in boot time.
> 
> I'll add per-bucket locks to keep the same behaviour without hurting
> scalability.

You probably should skip the MRU move if the TB is not within the first
N items of the list (e.g. N=4).  Then you take the lock much less.

Paolo