netdev - Re: [patch iproute2] tc: add -bs option for batch mode

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Date:   Wed, 20 Dec 2017 07:17:44 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Chris Mi <chrism@...lanox.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "gerlitz.or@...il.com" <gerlitz.or@...il.com>
Subject: Re: [patch iproute2] tc: add -bs option for batch mode

On Wed, 20 Dec 2017 09:23:34 +0000
Chris Mi <chrism@...lanox.com> wrote:

> > Your real performance win is just not asking for ACK for every rule.  
> No. Even if batch_size > 1, we ack every rule. The real performance win is
> to send multiple rules in one system call. If we are not asking for ACK for every rule,
> the performance will be improved further.

Try the no ACK method.

When we were optimizing routing daemons like Quagga, it was discovered
that an ACK for every route insert was the main bottleneck. Doing asynchronous
error handling got a bigger win than your batching.

Please try that, doing multiple messages using iov is not necessary.