netdev - Re: [PATCH net-next] gve: Support IPv6 Big TCP on DQ

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Message-ID: <ZGyTkjrvCIQozPUj@corigine.com>
Date: Tue, 23 May 2023 12:21:06 +0200
From: Simon Horman <simon.horman@...igine.com>
To: Ziwei Xiao <ziweixiao@...gle.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
	Coco Li <lixiaoyan@...gle.com>
Subject: Re: [PATCH net-next] gve: Support IPv6 Big TCP on DQ

On Mon, May 22, 2023 at 01:15:52PM -0700, Ziwei Xiao wrote:
> From: Coco Li <lixiaoyan@...gle.com>
> 
> Add support for using IPv6 Big TCP on DQ which can handle large TSO/GRO
> packets. See https://lwn.net/Articles/895398/. This can improve the
> throughput and CPU usage.
> 
> Perf test result:
> ip -d link show $DEV
> gso_max_size 185000 gso_max_segs 65535 tso_max_size 262143 tso_max_segs 65535 gro_max_size 185000
> 
> For performance, tested with neper using 9k MTU on hardware that supports 200Gb/s line rate.
> 
> In single streams when line rate is not saturated, we expect throughput improvements.
> When the networking is performing at line rate, we expect cpu usage improvements.
> 
> Tcp_stream (unidirectional stream test, T=thread, F=flow):
> skb=180kb, T=1, F=1, no zerocopy: throughput average=64576.88 Mb/s, sender stime=8.3, receiver stime=10.68
> skb=64kb,  T=1, F=1, no zerocopy: throughput average=64862.54 Mb/s, sender stime=9.96, receiver stime=12.67
> skb=180kb, T=1, F=1, yes zerocopy:  throughput average=146604.97 Mb/s, sender stime=10.61, receiver stime=5.52
> skb=64kb,  T=1, F=1, yes zerocopy:  throughput average=131357.78 Mb/s, sender stime=12.11, receiver stime=12.25
> 
> skb=180kb, T=20, F=100, no zerocopy:  throughput average=182411.37 Mb/s, sender stime=41.62, receiver stime=79.4
> skb=64kb,  T=20, F=100, no zerocopy:  throughput average=182892.02 Mb/s, sender stime=57.39, receiver stime=72.69
> skb=180kb, T=20, F=100, yes zerocopy: throughput average=182337.65 Mb/s, sender stime=27.94, receiver stime=39.7
> skb=64kb,  T=20, F=100, yes zerocopy: throughput average=182144.20 Mb/s, sender stime=47.06, receiver stime=39.01
> 
> Signed-off-by: Ziwei Xiao <ziweixiao@...gle.com>
> Signed-off-by: Coco Li <lixiaoyan@...gle.com>

Reviewed-by: Simon Horman <simon.horman@...igine.com>