Re: [PATCH net-next 0/3] nfp: flower: speed up stats update loop

[Jakub Kicinski]

On Wed, 10 Oct 2018 16:40:56 +0300, Or Gerlitz wrote:
> On Tue, Oct 9, 2018 at 4:58 AM Jakub Kicinski
> <jakub.kicin...@netronome.com> wrote:
> 
> > Given that our statistic IDs are already array indices, and considering
> > each statistic is only 24B in size, we decided to forego the use  
> 
> 8B packet + 8B bytes --> 16B -- does your FW/HW provide last use? how do
> you express this lastuse value in host jiffies?

24B is the size of the structure we keep in the driver, which costs
host memory.  The message from FW contains this:

struct nfp_fl_stats_frame {
        __be32 stats_con_id;
        __be32 pkt_count;
        __be64 byte_count;
        __be64 stats_cookie;
};