From: Jakub Kicinski <kuba@kernel.org>
To: "Íñigo Huguet" <ihuguet@redhat.com>
Cc: ecree.xilinx@gmail.com, habetsm.xilinx@gmail.com,
davem@davemloft.net, netdev@vger.kernel.org
Subject: Re: [PATCH net-next 1/2] sfc: default config to 1 channel/core in local NUMA node only
Date: Fri, 28 Jan 2022 14:27:28 -0800 [thread overview]
Message-ID: <20220128142728.0df3707e@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> (raw)
In-Reply-To: <20220128151922.1016841-2-ihuguet@redhat.com>
On Fri, 28 Jan 2022 16:19:21 +0100 Íñigo Huguet wrote:
> Handling channels from CPUs in different NUMA node can penalize
> performance, so better configure only one channel per core in the same
> NUMA node than the NIC, and not per each core in the system.
>
> Fallback to all other online cores if there are not online CPUs in local
> NUMA node.
I think we should make netif_get_num_default_rss_queues() do a similar
thing. Instead of min(8, num_online_cpus()) we should default to
num_cores / 2 (that's physical cores, not threads). From what I've seen
this appears to strike a good balance between wasting resources on
pointless queues per hyperthread, and scaling up for CPUs which have
many wimpy cores.
next prev parent reply other threads:[~2022-01-28 22:27 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-28 15:19 [PATCH net-next 0/2] sfc: optimize RXQs count and affinities Íñigo Huguet
2022-01-28 15:19 ` [PATCH net-next 1/2] sfc: default config to 1 channel/core in local NUMA node only Íñigo Huguet
2022-01-28 22:27 ` Jakub Kicinski [this message]
2022-02-07 15:03 ` Íñigo Huguet
2022-02-07 16:53 ` Jakub Kicinski
2022-02-10 9:35 ` Íñigo Huguet
2022-02-10 16:22 ` Jakub Kicinski
2022-02-11 11:05 ` Íñigo Huguet
2022-02-11 19:01 ` Jakub Kicinski
2022-02-14 7:22 ` Íñigo Huguet
2022-02-19 13:53 ` Martin Habets
2022-01-28 15:19 ` [PATCH net-next 2/2] sfc: set affinity hints " Íñigo Huguet
2022-02-16 9:41 ` [PATCH net-next resend 0/2] sfc: optimize RXQs count and affinities Íñigo Huguet
2022-02-16 9:41 ` [PATCH net-next resend 1/2] sfc: default config to 1 channel/core in local NUMA node only Íñigo Huguet
2022-02-19 13:50 ` Martin Habets
2022-02-16 9:41 ` [PATCH net-next resend 2/2] sfc: set affinity hints " Íñigo Huguet
2022-02-19 13:51 ` Martin Habets
2022-02-19 5:19 ` [PATCH net-next resend 0/2] sfc: optimize RXQs count and affinities Jakub Kicinski
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