netdev - Re: [PATCH net-next] net: ibm: replenish rx pool and poll less frequently

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Message-ID: <0bddd39e-b6da-2c69-fd37-a08bd5a1e18b@linux.vnet.ibm.com>
Date:   Wed, 2 Jun 2021 10:47:27 -0700
From:   Rick Lindsley <ricklind@...ux.vnet.ibm.com>
To:     Lijun Pan <lijunp213@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: ibm: replenish rx pool and poll less
 frequently

On 6/2/21 10:01 AM, Lijun Pan wrote:
> The old mechanism replenishes rx pool even only one frames is processed in
> the poll function, which causes lots of overheads. The old mechanism
> restarts polling until processed frames reaches the budget, which can
> cause the poll function to loop into restart_poll 63 times at most and to
> call replenish_rx_poll 63 times at most.

Presumably this frequency is to keep ahead of demand.  When you say lots
of overhead - can you attach a number to that?  How much does this change
improve on that number (what workload benefits?)