Re: [PATCH net-next 00/10] net: faster and simpler CRC32C computation

Andrew Lunn
2025-05-11T21:22:21Z

On Sun, May 11, 2025 at 10:29:29AM -0700, Eric Biggers wrote:
> On Sun, May 11, 2025 at 06:30:25PM +0200, Andrew Lunn wrote:
> > On Sat, May 10, 2025 at 05:41:00PM -0700, Eric Biggers wrote:
> > > Update networking code that computes the CRC32C of packets to just call
> > > crc32c() without unnecessary abstraction layers. The result is faster
> > > and simpler code.
> >
> > Hi Eric
> >
> > Do you have some benchmarks for these changes?
> >
> > Andrew
>
> Do you want benchmarks that show that removing the indirect calls makes things
> faster? I think that should be fairly self-evident by now after dealing with
> retpoline for years, but I can provide more details if you need them.

I was think more like iperf before/after? Show the CPU load has gone
down without the bandwidth also going down.

Eric Dumazet has a T-Shirt with a commit message on the back which
increased network performance by X%. At the moment, there is nothing
T-Shirt quotable here.

Andrew