netdev - Re: [PATCH net-next V3 00/16] net: fec: cleanup and fixes

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Date:	Wed, 6 Apr 2016 09:43:00 -0700
From:	Troy Kisky <troy.kisky@...ndarydevices.com>
To:	Fugang Duan <fugang.duan@....com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"lznuaa@...il.com" <lznuaa@...il.com>
Cc:	Fabio Estevam <fabio.estevam@....com>,
	"l.stach@...gutronix.de" <l.stach@...gutronix.de>,
	"andrew@...n.ch" <andrew@...n.ch>,
	"tremyfr@...il.com" <tremyfr@...il.com>,
	"gerg@...inux.org" <gerg@...inux.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"johannes@...solutions.net" <johannes@...solutions.net>,
	"stillcompiling@...il.com" <stillcompiling@...il.com>,
	"sergei.shtylyov@...entembedded.com" 
	<sergei.shtylyov@...entembedded.com>,
	"arnd@...db.de" <arnd@...db.de>
Subject: Re: [PATCH net-next V3 00/16] net: fec: cleanup and fixes

On 4/6/2016 1:51 AM, Fugang Duan wrote:
> From: Troy Kisky <troy.kisky@...ndarydevices.com> Sent: Wednesday, April 06, 2016 10:26 AM
>> To: netdev@...r.kernel.org; davem@...emloft.net; Fugang Duan
>> <fugang.duan@....com>; lznuaa@...il.com
>> Cc: Fabio Estevam <fabio.estevam@....com>; l.stach@...gutronix.de;
>> andrew@...n.ch; tremyfr@...il.com; gerg@...inux.org; linux-arm-
>> kernel@...ts.infradead.org; johannes@...solutions.net;
>> stillcompiling@...il.com; sergei.shtylyov@...entembedded.com;
>> arnd@...db.de; Troy Kisky <troy.kisky@...ndarydevices.com>
>> Subject: [PATCH net-next V3 00/16] net: fec: cleanup and fixes
>>
>> V3 has
>>
>> 1 dropped patch "net: fec: print more debug info in fec_timeout"
>> 2 new patches
>> 0002-net-fec-remove-unused-interrupt-FEC_ENET_TS_TIMER.patch
>> 0003-net-fec-return-IRQ_HANDLED-if-fec_ptp_check_pps_even.patch
>>
>> 1 combined patch
>> 0004-net-fec-pass-rxq-txq-to-fec_enet_rx-tx_queue-instead.patch
>>
>> The changes are noted on individual patches
>>
>> My measured performance of this series is
>>
>> before patch set
>> 365 Mbits/sec Tx/407 RX
>>
>> after patch set
>> 374 Tx/427 Rx
>>
> 
> I doubt the performance data,  I validate it on i.MX6q sabresd board on the latest commit(4da46cebbd3b) in net tree.



I was doing UDP tests, as outlined in my V2 cover letter. Also, my cpu is 1G. Is yours 1.2G?




> root@...6qdlsolo:~# uname -a
> Linux imx6qdlsolo 4.6.0-rc1-00318-g4da46ce #180 SMP Wed Apr 6 16:24:09 CST 2016 armv7l GNU/Linux


This is the V2 patch that I dropped.

I will force update my local net-next_master branch, to make testing this series easier.
Note that my local net-next_master branch has about 19 patches on top of this series.
so,

tkisky@...ice-server2:~/linux-imx6$ git reset --hard HEAD~19
HEAD is now at a125da7 net: fec: don't set cbd_bufaddr unless no mapping error


> 
> TCP RX performance is 602Mbps, TX is only 325Mbps,   TX path has some performance issue in net tree.
> I will dig out it.
> 
> 


More testing is always better. Thanks


>>
>> Troy Kisky (16):
>>   net: fec: only check queue 0 if RXF_0/TXF_0 interrupt is set
>>   net: fec: remove unused interrupt FEC_ENET_TS_TIMER
>>   net: fec: return IRQ_HANDLED if fec_ptp_check_pps_event handled it
>>   net: fec: pass rxq/txq to fec_enet_rx/tx_queue instead of queue_id
>>   net: fec: reduce interrupts
>>   net: fec: split off napi routine with 3 queues
>>   net: fec: don't clear all rx queue bits when just one is being checked
>>   net: fec: set cbd_sc without relying on previous value
>>   net: fec: eliminate calls to fec_enet_get_prevdesc
>>   net: fec: move restart test for efficiency
>>   net: fec: clear cbd_sc after transmission to help with debugging
>>   net: fec: dump all tx queues in fec_dump
>>   net: fec: detect tx int lost
>>   net: fec: create subroutine reset_tx_queue
>>   net: fec: call dma_unmap_single on mapped tx buffers at restart
>>   net: fec: don't set cbd_bufaddr unless no mapping error
>>
>>  drivers/net/ethernet/freescale/fec.h      |  10 +-
>>  drivers/net/ethernet/freescale/fec_main.c | 410 ++++++++++++++++------------
>> --
>>  2 files changed, 218 insertions(+), 202 deletions(-)
>>
>> --
>> 2.5.0
>