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Message-ID: <20230216095324.4fa4f6fb@kernel.org> Date: Thu, 16 Feb 2023 09:53:24 -0800 From: Jakub Kicinski <kuba@...nel.org> To: Alexander Lobakin <aleksander.lobakin@...el.com> Cc: Saeed Mahameed <saeed@...nel.org>, "David S. Miller" <davem@...emloft.net>, Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>, "Saeed Mahameed" <saeedm@...dia.com>, <netdev@...r.kernel.org>, Tariq Toukan <tariqt@...dia.com>, Gal Pressman <gal@...dia.com> Subject: Re: [net-next 1/9] net/mlx5e: Switch to using napi_build_skb() On Thu, 16 Feb 2023 18:26:19 +0100 Alexander Lobakin wrote: > > Before: 26.5 Gbits/sec > > After: 30.1 Gbits/sec (+13.6%) > > +14%, gosh! Happy to see more and more vendors switching to it, someone > told me back then we have so fast RAM nowadays that it won't make any > sense to directly recycle kmem-cached objects. Maybe it's fast, but > seems like not *so* fast :D Interestingly I had a similar patch in my tree when testing the skb_ext cache and enabling slow_gro kills this gain. IOW without adding an skb_ext using napi_build_skb() gives me ~12% boost. If I start adding skb_ext (with the cache and perfect reuse) I'm back to the baseline (26.5Gbps in this case). But without using napi_build_skb() adding skb_ext (with the cache) doesn't change anything, skb_ext or not, I'll get 26.5Gbps. Very finicky. Not sure why this happens. Perhaps napi_build_skb() let's us fit under some CPU resource constraint and additional functionality knocks us back over the line?
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