netdev - Re: [PATCH v2 net-next] mlx4: optimize xmit path

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Message-ID: <1412251620.16704.88.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 02 Oct 2014 05:07:00 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Amir Vadai <amirv@...lanox.com>
Cc:	Or Gerlitz <gerlitz.or@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Or Gerlitz <or.gerlitz@...il.com>, amira@...lanox.com,
	idos@...lanox.com, Yevgeny Petrilin <yevgenyp@...lanox.com>,
	eyalpe@...lanox.com
Subject: Re: [PATCH v2 net-next] mlx4: optimize xmit path

On Thu, 2014-10-02 at 14:56 +0300, Amir Vadai wrote:
> After making sure the sender thread and the TX completions are not on
> the same CPU, I see the expected improvement. +0.5Mpps with tx
> optimizations.

I got 40% here.

Hmm... both cpus are on the same socket, right ?

TX coalescing is properly setup ?

What interrupt rate do you get ?

You can take a look at where cycles are spent

perf record -a -g sleep 5
perf report


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