netdev - Re: [PATCH RFC 11/11] net/mlx5e: XDP TX xmit more

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Message-ID: <1473360779.18970.2.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Thu, 08 Sep 2016 11:52:59 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Rick Jones <rick.jones2@....com>
Cc:     Tom Herbert <tom@...bertland.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Saeed Mahameed <saeedm@....mellanox.co.il>,
        Saeed Mahameed <saeedm@...lanox.com>,
        iovisor-dev <iovisor-dev@...ts.iovisor.org>,
        Linux Netdev List <netdev@...r.kernel.org>,
        Tariq Toukan <tariqt@...lanox.com>,
        Brenden Blanco <bblanco@...mgrid.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Achiad Shochat <achiad@...lanox.com>
Subject: Re: [PATCH RFC 11/11] net/mlx5e: XDP TX xmit more

On Thu, 2016-09-08 at 11:48 -0700, Rick Jones wrote:

> With small packets and the "default" ring size for this NIC/driver 
> combination, is the BQL large enough that the ring fills before one hits 
> the BQL?

It depends on how TX completion (NAPI handler) is implemented in the
driver.

Say how many packets can be dequeued by each invocation.

Drivers have a lot of variations there.