Re: [RFC v2 00/24] Per queue configs and large rx buffer support for zcrx

[Pavel Begunkov <asml.silence@gmail.com>]

On 8/15/25 17:44, Dragos Tatulea wrote:
> On Thu, Aug 14, 2025 at 11:46:35AM +0100, Pavel Begunkov wrote:
...>> "-A1" here is for using huge pages, so don't forget to configure
>> /proc/sys/vm/nr_hugepages.
>>
>> # client
>> examples/send-zerocopy -6 tcp -D <ip addr> -p <port>
>>                         -t <runtime secs>
>>                         -l -b1 -n1 -z1 -d -s<send size>
>>
> Thanks a lot for the branch and the instructions Pavel! I am playing
> with them now and seeing some preliminary good results. Will post
> them once we share the patches.

Sounds good

>> I had to play with the client a bit for it to keep up with
>> the server. "-l" enables huge pages, and had to bump up the
>> send size. You can also add -v to both for a basic payload
>> verification.
>>
> I see what you mean. I also had to make the rx memory larger once

Forgot to mention that the tool doesn't consider CPU affinities,
so I had to configure task and irq affinities by hand.

> rx-buf-len >= 32K. Otherwise the traffic was hanging after a second or
> so. This is probably related to the currently known issue where if a
> page_pool is too small due to incorrect sizing of the buffer, mlx5 hangs
> on first refill. That still needs fixing.

-- 
Pavel Begunkov