netdev - Re: [PATCH net-next v2 0/4] Implement classifier-action terse dump mode

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Message-ID: <20200515100448.12b2c73d@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 15 May 2020 10:04:48 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vlad Buslov <vladbu@...lanox.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, jhs@...atatu.com,
        xiyou.wangcong@...il.com, jiri@...nulli.us, dcaratti@...hat.com,
        marcelo.leitner@...il.com
Subject: Re: [PATCH net-next v2 0/4] Implement classifier-action terse dump
 mode

On Fri, 15 May 2020 14:40:10 +0300 Vlad Buslov wrote:
> Output rate of current upstream kernel TC filter dump implementation if
> relatively low (~100k rules/sec depending on configuration). This
> constraint impacts performance of software switch implementation that
> rely on TC for their datapath implementation and periodically call TC
> filter dump to update rules stats. Moreover, TC filter dump output a lot
> of static data that don't change during the filter lifecycle (filter
> key, specific action details, etc.) which constitutes significant
> portion of payload on resulting netlink packets and increases amount of
> syscalls necessary to dump all filters on particular Qdisc. In order to
> significantly improve filter dump rate this patch sets implement new
> mode of TC filter dump operation named "terse dump" mode. In this mode
> only parameters necessary to identify the filter (handle, action cookie,
> etc.) and data that can change during filter lifecycle (filter flags,
> action stats, etc.) are preserved in dump output while everything else
> is omitted.

Please keep the review tags you already got when making minor changes.

Reviewed-by: Jakub Kicinski <kuba@...nel.org>