netdev - RE: [Intel-wired-lan] [next-queue v4 4/4] i40e: Add i40e_napi

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Date:   Fri, 14 Oct 2022 03:56:00 +0000
From:   "G, GurucharanX" <gurucharanx.g@...el.com>
To:     Joe Damato <jdamato@...tly.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>
Subject: RE: [Intel-wired-lan] [next-queue v4 4/4] i40e: Add i40e_napi_poll
 tracepoint



> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
> Joe Damato
> Sent: Saturday, October 8, 2022 3:09 AM
> To: intel-wired-lan@...ts.osuosl.org
> Cc: netdev@...r.kernel.org; Joe Damato <jdamato@...tly.com>;
> kuba@...nel.org; davem@...emloft.net
> Subject: [Intel-wired-lan] [next-queue v4 4/4] i40e: Add i40e_napi_poll
> tracepoint
> 
> Add a tracepoint for i40e_napi_poll that allows users to get detailed
> information about the amount of work done. This information can help users
> better tune the correct NAPI parameters (like weight and budget), as well as
> debug NIC settings like rx-usecs and tx-usecs, etc.
> 
> When perf is attached, this tracepoint only fires when not in XDP mode.
> 
> An example of the output from this tracepoint:
> 
> $ sudo perf trace -e i40e:i40e_napi_poll -a --call-graph=fp --
> libtraceevent_print
> 
> [..snip..]
> 
> 388.258 :0/0 i40e:i40e_napi_poll(i40e_napi_poll on dev eth2 q i40e-eth2-
> TxRx-9 irq 346 irq_mask
> 00000000,00000000,00000000,00000000,00000000,00800000 curr_cpu 23
> budget 64 bpr 64 rx_cleaned 28 tx_cleaned 0 rx_clean_complete 1
> tx_clean_complete 1)
> 	i40e_napi_poll ([i40e])
> 	i40e_napi_poll ([i40e])
> 	__napi_poll ([kernel.kallsyms])
> 	net_rx_action ([kernel.kallsyms])
> 	__do_softirq ([kernel.kallsyms])
> 	common_interrupt ([kernel.kallsyms])
> 	asm_common_interrupt ([kernel.kallsyms])
> 	intel_idle_irq ([kernel.kallsyms])
> 	cpuidle_enter_state ([kernel.kallsyms])
> 	cpuidle_enter ([kernel.kallsyms])
> 	do_idle ([kernel.kallsyms])
> 	cpu_startup_entry ([kernel.kallsyms])
> 	[0x243fd8] ([kernel.kallsyms])
> 	secondary_startup_64_no_verify ([kernel.kallsyms])
> 
> Signed-off-by: Joe Damato <jdamato@...tly.com>
> Acked-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Acked-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
> ---
>  drivers/net/ethernet/intel/i40e/i40e_trace.h | 49
> ++++++++++++++++++++++++++++
> drivers/net/ethernet/intel/i40e/i40e_txrx.c  |  4 +++
>  2 files changed, 53 insertions(+)
> 

Tested-by: Gurucharan <gurucharanx.g@...el.com> (A Contingent worker at Intel)