netdev - Re: [RFC net] net/mlx5: Fix performance regression for request-response workloads

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Date:   Thu, 27 Apr 2023 11:44:10 +0200
From:   Alexandra Winter <wintera@...ux.ibm.com>
To:     Saeed Mahameed <saeedm@...dia.com>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        netdev <netdev@...r.kernel.org>, linux-s390@...r.kernel.org,
        Heiko Carstens <hca@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Halil Pasic <pasic@...ux.ibm.com>
Subject: Re: [RFC net] net/mlx5: Fix performance regression for
 request-response workloads


On 29.12.22 09:27, Alexandra Winter wrote:
> 
> 
> On 01.10.22 01:37, Saeed Mahameed wrote:
>> On 26 Sep 12:06, Alexandra Winter wrote:
>>
>> [ ... ]
>>>
>>> Saeed,
>>> As discussed at LPC, could you please consider adding a workaround to the
>>> Mellanox driver, to use non-SG SKBs for small messages? As mentioned above
>>> we are seeing 13% throughput degradation, if 2 pages need to be mapped
>>> instead of 1.
>>>
>>> While Eric's ideas sound very promising, just using non-SG in these cases
>>> should be enough to mitigate the performance regression we see.
>>
>> Hi Alexandra, sorry for the late response.
>>
>> Yeas linearizing small messages makes sense, but will require some careful
>> perf testing.
>>
>> We will do our best to include this in the next kernel release cycle.
>> I will take it with the mlx5e team next week, everybody is on vacation this
>> time of year :).
>>
>> Thanks,
>> Saeed.
> 
> Hello Saeed,
> may I ask whether you had a chance to include such a patch in the 6.2 kernel?
> Or is this still on your ToDo list?
> I haven't seen anything like this on the mailing list, but I may have overlooked it.
> All the best for 2023
> Alexandra


Hello Saeed,
any news about linearizing small messages? Is there any way we could be of help?

Kind regards
Alexandra