linux-kernel - Re: Error 'netif_napi_add_weight() called with weight 256'

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Message-ID: <20230807093727.5249f517@kernel.org>
Date:   Mon, 7 Aug 2023 09:37:27 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Hayes Wang <hayeswang@...ltek.com>
Cc:     "Limonciello, Mario" <mario.limonciello@....com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        Paul Menzel <pmenzel@...gen.mpg.de>
Subject: Re: Error 'netif_napi_add_weight() called with weight 256'

On Mon, 7 Aug 2023 09:57:15 +0000 Hayes Wang wrote:
> > Perhaps Hayes Wang can comment on this (as the author of 195aae321c82).  
> 
> I test our devices on an Embedded system.
> We find the throughput is low.
> And it is caused by the weight.
> Our NAPI function often uses the whole budget.
> Finally, we increase the weight, and the throughput is good.

Could it possibly be related to handling of aggregation?
Problem must lay somewhere in USB specifics, since as I said
there are 100Gbps devices running fine with budget of 64.