netdev - Re: [PATCH net-next] net: mana: Increase the DEF_RX_BUFFERS_PER

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Message-ID: <20240920083933.GA15696@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date: Fri, 20 Sep 2024 01:39:33 -0700
From: Shradha Gupta <shradhagupta@...ux.microsoft.com>
To: Simon Horman <horms@...nel.org>
Cc: linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Long Li <longli@...rosoft.com>,
	Konstantin Taranov <kotaranov@...rosoft.com>,
	Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>,
	Erick Archer <erick.archer@...look.com>,
	Pavan Chebbi <pavan.chebbi@...adcom.com>,
	Ahmed Zaki <ahmed.zaki@...el.com>,
	Colin Ian King <colin.i.king@...il.com>,
	Shradha Gupta <shradhagupta@...rosoft.com>
Subject: Re: [PATCH net-next] net: mana: Increase the
 DEF_RX_BUFFERS_PER_QUEUE to 1024

On Sun, Sep 15, 2024 at 07:08:35PM +0100, Simon Horman wrote:
> On Sat, Sep 14, 2024 at 09:56:24PM -0700, Shradha Gupta wrote:
> > Through some experiments, we found out that increasing the default
> > RX buffers count from 512 to 1024, gives slightly better throughput
> > and significantly reduces the no_wqe_rx errs on the receiver side.
> > Along with these, other parameters like cpu usage, retrans seg etc
> > also show some improvement with 1024 value.
> > 
> > Following are some snippets from the experiments
> > 
> > ntttcp tests with 512 Rx buffers
> > ---------------------------------------
> > connections|  throughput|  no_wqe errs|
> > ---------------------------------------
> > 1          |  40.93Gbps | 123,211     |
> > 16         | 180.15Gbps | 190,120
> > 128        | 180.20Gbps | 173,508     |
> > 256        | 180.27Gbps | 189,884     |
> > 
> > ntttcp tests with 1024 Rx buffers
> > ---------------------------------------
> > connections|  throughput|  no_wqe errs|
> > ---------------------------------------
> > 1          |  44.22Gbps | 19,864      |
> > 16         | 180.19Gbps | 4,430       |
> > 128        | 180.21Gbps | 2,560       |
> > 256        | 180.29Gbps | 1,529       |
> > 
> > So, increasing the default RX buffers per queue count to 1024
> > 
> > Signed-off-by: Shradha Gupta <shradhagupta@...ux.microsoft.com>
> > Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
> 
> Hi Shradha,
> 
> net-next is currently closed other than for bug fixes.
> Please consider reposting once it re-opens, after v6.12-rc1
> has been released.
Noted, thanks Simon
> 
> -- 
> pw-bot: defer