netdev - Re: [PATCH net] vmxnet3: use gro callback when UPT is enabled

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Date:   Thu, 16 Mar 2023 05:21:42 +0000
From:   Ronak Doshi <doshir@...are.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     Yunsheng Lin <linyunsheng@...wei.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Pv-drivers <Pv-drivers@...are.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Guolin Yang <gyang@...are.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] vmxnet3: use gro callback when UPT is enabled


> On 3/15/23, 9:13 PM, "Jakub Kicinski" <kuba@...nel.org <mailto:kuba@...nel.org>> wrote:
> 
> Can you provide some numbers to illustrate what the slow down is?

Below are some sample test numbers collected by our perf team. 
                          Test                                    socket & msg size                          base               using only gro
1VM    14vcpu UDP stream receive        256K 256 bytes (packets/sec)    217.01 Kps    187.98 Kps         -13.37%
16VM  2vcpu   TCP stream send Thpt     8K     256 bytes (Gbps)                18.00 Gbps    17.02 Gbps         -5.44%
1VM    14vcpu ResponseTimeMean Receive (in micro secs)                      163 us             170 us                -4.29%

In the past as well similar test was done. See
https://patchwork.ozlabs.org/project/netdev/patch/1308947605-4300-1-git-send-email-jesse@nicira.com/

But, unfortunately there are no stats present in that discussion.

Thanks,
Ronak