Re: [PATCH] x86_64: inline csum_ipv6_magic()

[Dave Hansen]

On 11/13/25 10:18, Eric Dumazet wrote:
> So it would seem the patch saves 371 bytes for this config.
> 
>> Or, is there a discrete, measurable performance gain from doing this?
> IPv6 incoming TCP/UDP paths call this function twice per packet, which is sad...
> One call per TX packet.
> 
> Depending on the cpus I can see csum_ipv6_magic() using up to 0.75 %
> of cpu cycles.
> Then there is the cost in the callers, harder to measure...

Oh, wow. That's more than I was expecting. But it does make sense.
Thanks for the info. I'll stick this in the queue to apply in a month or
so after the next -rc1, unless it needs more urgency.

Acked-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>