netdev - Re: [PATCH RFC xfrm-next v3 0/8] Extend XFRM core to allow full offload configuration

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Date:   Tue, 27 Sep 2022 07:59:03 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        <netdev@...r.kernel.org>, Paolo Abeni <pabeni@...hat.com>,
        Raed Salem <raeds@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Bharat Bhushan <bbhushan2@...vell.com>
Subject: Re: [PATCH RFC xfrm-next v3 0/8] Extend XFRM core to allow full
 offload configuration

On Mon, Sep 26, 2022 at 09:55:45AM +0300, Leon Romanovsky wrote:
> On Sun, Sep 25, 2022 at 11:40:39AM +0200, Steffen Klassert wrote:
> > On Wed, Sep 21, 2022 at 08:37:06PM +0300, Leon Romanovsky wrote:
> > > On Wed, Sep 21, 2022 at 07:59:27AM -0700, Jakub Kicinski wrote:
> > > > On Thu, 8 Sep 2022 12:56:16 +0300 Leon Romanovsky wrote:
> > > > > I have TX traces too and can add if RX are not sufficient. 
> > > > 
> > > > The perf trace is good, but for those of us not intimately familiar
> > > > with xfrm, could you provide some analysis here?
> > > 
> > > The perf trace presented is for RX path of IPsec crypto offload mode. In that
> > > mode, decrypted packet enters the netdev stack to perform various XFRM specific
> > > checks.
> > 
> > Can you provide the perf traces and analysis for the TX side too? That
> > would be interesting in particular, because the policy and state lookups
> > there happen still in software.
> 
> Single core TX (crypto mode) from the same run:
> Please notice that it is not really bottleneck, probably RX caused to the situation
> where TX was not executed enough. It is also lighter path than RX.

Thanks for this! How many policies and SAs were installed when you ran
this? A run with 'many' policies and SAs would be interesting, in
particualar a comparison between crypto and full offload. That would
show us where the performance of the full offload comes from.