> -----Original Message-----
> From: Jakub Kicinski <[email protected]>
> Sent: Thursday, March 7, 2024 12:02 PM
> To: Haiyang Zhang <[email protected]>
> Cc: Shradha Gupta <[email protected]>; Shradha Gupta
> <[email protected]>; [email protected]; linux-
> [email protected]; [email protected];
> [email protected]; Eric Dumazet <[email protected]>; Paolo Abeni
> <[email protected]>; Ajay Sharma <[email protected]>; Leon
> Romanovsky <[email protected]>; Thomas Gleixner <[email protected]>;
> Sebastian Andrzej Siewior <[email protected]>; KY Srinivasan
> <[email protected]>; Wei Liu <[email protected]>; Dexuan Cui
> <[email protected]>; Long Li <[email protected]>; Michael Kelley
> <[email protected]>
> Subject: Re: [PATCH] net :mana : Add per-cpu stats for MANA device
>
> On Thu, 7 Mar 2024 15:49:15 +0000 Haiyang Zhang wrote:
> > > > Extend 'ethtool -S' output for mana devices to include per-CPU
> packet
> > > > stats
> > >
> > > But why? You already have per queue stats.
> > Yes. But the q to cpu binding is dynamic, we also want the per-CPU stat
> > to analyze the CPU usage by counting the packets and bytes on each CPU.
>
> Dynamic is a bit of an exaggeration, right? On a well-configured system
> each CPU should use a single queue assigned thru XPS. And for manual
> debug bpftrace should serve the purpose quite well.
Some programs, like irqbalancer can dynamically change the CPU affinity,
so we want to add the per-CPU counters for better understanding of the CPU
usage.
Thanks,
- Haiyang
