Re: [PATCH] repairing rtcache killer

[kuznet@xxxxxxxxxxxxx]

Hello!

> +             if (in_hit < in_slow_tot) {
> +                     /* Aggressive  */
> +                     if(ip_rt_gc_elasticity2 > 1) 
> +                             ip_rt_gc_elasticity2 >>= 1;
> +             }
> +             else 
> +                     if(ip_rt_gc_elasticity2 < 2*ip_rt_gc_elasticity) {
> +                             ip_rt_gc_elasticity2 <<= 1;
> +                     }

It is the system with positive feedback. Reduction of chain length
results in increasing amount of misses and so on. Under normal load
it has the only stable state, zero chain length and will never leave it.

hits/misses is wrong feedback, unless you use it to increase chain length. :-)

Alexey