Re: [PATCH v1 00/15] io_uring zero copy rx

Jens Axboe
2024-10-09T16:53:56Z

On 10/9/24 10:50 AM, Jens Axboe wrote:
> On 10/9/24 10:35 AM, David Ahern wrote:
>> On 10/9/24 9:43 AM, Jens Axboe wrote:
>>> Yep basically line rate, I get 97-98Gbps. I originally used a slower box
>>> as the sender, but then you're capped on the non-zc sender being too
>>> slow. The intel box does better, but it's still basically maxing out the
>>> sender at this point. So yeah, with a faster (or more efficient sender),
>>
>> I am surprised by this comment. You should not see a Tx limited test
>> (including CPU bound sender). Tx with ZC has been the easy option for a
>> while now.
>
> I just set this up to test yesterday and just used default! I'm sure
> there is a zc option, just not the default and hence it wasn't used.
> I'll give it a spin, will be useful for 200G testing.

I think we're talking past each other. Yes send with zerocopy is
available for a while now, both with io_uring and just sendmsg(), but
I'm using kperf for testing and it does not look like it supports it.
Might have to add it... We'll see how far I can get without it.

--
Jens Axboe