linux-kernel - Re: [Intel-wired-lan] [PATCH net-next 7/9] igc: switch to napi_build

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Message-ID: <2eb0a775-2035-f806-b391-d3ce8d3e53a2@linux.intel.com>
Date:   Wed, 8 Dec 2021 10:15:30 +0200
From:   "Kraus, NechamaX" <nechamax.kraus@...ux.intel.com>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        intel-wired-lan@...ts.osuosl.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [Intel-wired-lan] [PATCH net-next 7/9] igc: switch to
 napi_build_skb()

On 11/23/2021 19:18, Alexander Lobakin wrote:
> napi_build_skb() reuses per-cpu NAPI skbuff_head cache in order
> to save some cycles on freeing/allocating skbuff_heads on every
> new Rx or completed Tx.
> igc driver runs Tx completion polling cycle right before the Rx
> one and uses napi_consume_skb() to feed the cache with skbuff_heads
> of completed entries, so it's never empty and always warm at that
> moment. Switch to the napi_build_skb() to relax mm pressure on
> heavy Rx.
> 
> Signed-off-by: Alexander Lobakin <alexandr.lobakin@...el.com>
> Reviewed-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
> ---
>   drivers/net/ethernet/intel/igc/igc_main.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
Tested-by: Nechama Kraus <nechamax.kraus@...ux.intel.com>