netdev - RE: [Intel-wired-lan] [PATCH net-next v2 1/3] i40e, xsk: remove HW descriptor prefetch in AF

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Message-ID: <DM6PR11MB2890634F51624FE7FCE50A60BC2A0@DM6PR11MB2890.namprd11.prod.outlook.com>
Date:   Sat, 5 Sep 2020 02:58:18 +0000
From:   "Brown, Aaron F" <aaron.f.brown@...el.com>
To:     Björn Töpel <bjorn.topel@...il.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "Topel, Bjorn" <bjorn.topel@...el.com>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        "kuba@...nel.org" <kuba@...nel.org>
Subject: RE: [Intel-wired-lan] [PATCH net-next v2 1/3] i40e, xsk: remove HW
 descriptor prefetch in AF_XDP path

> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
> Björn Töpel
> Sent: Tuesday, August 25, 2020 4:36 AM
> To: intel-wired-lan@...ts.osuosl.org
> Cc: netdev@...r.kernel.org; bpf@...r.kernel.org; Topel, Bjorn
> <bjorn.topel@...el.com>; Karlsson, Magnus <magnus.karlsson@...el.com>;
> kuba@...nel.org
> Subject: [Intel-wired-lan] [PATCH net-next v2 1/3] i40e, xsk: remove HW
> descriptor prefetch in AF_XDP path
> 
> From: Björn Töpel <bjorn.topel@...el.com>
> 
> The software prefetching of HW descriptors has a negative impact on
> the performance. Therefore, it is now removed.
> 
> Performance for the rx_drop benchmark increased with 2%.
> 
> Signed-off-by: Björn Töpel <bjorn.topel@...el.com>
> ---
>  drivers/net/ethernet/intel/i40e/i40e_txrx.c        | 13 +++++++++++++
>  drivers/net/ethernet/intel/i40e/i40e_txrx_common.h | 13 -------------
>  drivers/net/ethernet/intel/i40e/i40e_xsk.c         | 12 ++++++++++++
>  3 files changed, 25 insertions(+), 13 deletions(-)
> 
Tested-by: Aaron Brown <aaron.f.brown@...el.com>