netdev - Re: [PATCH] mlx4_en: map entire pages to increase throughput

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Message-ID: <20120716204717.GA16137@oc1711230544.ibm.com>
Date:	Mon, 16 Jul 2012 17:47:17 -0300
From:	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"yevgenyp@...lanox.co.il" <yevgenyp@...lanox.co.il>,
	"ogerlitz@...lanox.com" <ogerlitz@...lanox.com>,
	"amirv@...lanox.com" <amirv@...lanox.com>,
	"brking@...ux.vnet.ibm.com" <brking@...ux.vnet.ibm.com>,
	"leitao@...ux.vnet.ibm.com" <leitao@...ux.vnet.ibm.com>,
	"klebers@...ux.vnet.ibm.com" <klebers@...ux.vnet.ibm.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"anton@...ba.org" <anton@...ba.org>
Subject: Re: [PATCH] mlx4_en: map entire pages to increase throughput

On Mon, Jul 16, 2012 at 12:42:41PM -0700, Rick Jones wrote:
> On 07/16/2012 12:06 PM, Thadeu Lima de Souza Cascardo wrote:
> >On Mon, Jul 16, 2012 at 10:27:57AM -0700, Rick Jones wrote:
> >
> >>What is the effect on packet-per-second performance?  (eg aggregate,
> >>burst-mode netperf TCP_RR with TCP_NODELAY set or perhaps UDP_RR)
> >>
> >I used uperf with TCP_NODELAY and 16 threads sending from another
> >machine 64000-sized writes for 60 seconds.
> >
> >I get 5898op/s (3.02Gb/s) without the patch against 18022ops/s
> >(9.23Gb/s) with the patch.
> 
> I was thinking more along the lines of an additional comparison,
> explicitly using netperf TCP_RR or something like it, not just the
> packets per second from a bulk transfer test.
> 
> rick
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> 

I used a uperf profile that is similar to TCP_RR. It writes, then reads
some bytes. I kept the TCP_NODELAY flag.

Without the patch, I saw the following:

packet size	ops/s		Gb/s
1		337024		0.0027
90		276620		0.199
900		190455		1.37
4000		68863		2.20
9000		45638		3.29
60000		9409		4.52

With the patch:

packet size	ops/s		Gb/s
1		451738		0.0036
90		345682		0.248
900		272258		1.96
4000		127055		4.07
9000		106614		7.68
60000		30671		14.72

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