netdev - Re: throughput problems with realtek

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 15 Jan 2014 18:25:56 +0200
From:	Dmitry Kasatkin <dmitry.kasatkin@...il.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	nic_swsd@...ltek.com, romieu@...zoreil.com, netdev@...r.kernel.org,
	l.moiseichuk@...sung.com
Subject: Re: throughput problems with realtek

On Wed, Jan 15, 2014 at 6:23 PM, Rick Jones <rick.jones2@...com> wrote:
> On 01/15/2014 03:56 AM, Dmitry Kasatkin wrote:
>>
>> Hi,
>>
>> We have several devices with such adapter..
>>
>> Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411
>> PCI Express Gigabit Ethernet Controller (rev 06)
>> See output of the lspci -vvv bellow...
>>
>> And I suddenly investigated throughput issues..
>>
>> After couple minutes of running 'iperf -c server' transmission speed
>> drops substantially...
>>
>> [  4]  0.0-10.0 sec  1.10 GBytes   948 Mbits/sec
>> [  5] local 106.122.1.113 port 5001 connected with 106.122.1.121 port
>> 60508
>> [  5]  0.0-10.0 sec  1.10 GBytes   948 Mbits/sec
>> [  4] local 106.122.1.113 port 5001 connected with 106.122.1.121 port
>> 60509
>> [  4]  0.0-10.0 sec  1.10 GBytes   949 Mbits/sec
>> [  5] local 106.122.1.113 port 5001 connected with 106.122.1.121 port
>> 60510
>> [  5]  0.0-10.0 sec  1.10 GBytes   948 Mbits/sec
>> [  4] local 106.122.1.113 port 5001 connected with 106.122.1.121 port
>> 60511
>> [  4]  0.0-10.0 sec   626 MBytes   525 Mbits/sec
>> [  5] local 106.122.1.113 port 5001 connected with 106.122.1.121 port
>> 60512
>> [  5]  0.0-10.0 sec  84.4 MBytes  70.5 Mbits/sec
>> [  4] local 106.122.1.113 port 5001 connected with 106.122.1.121 port
>> 60513
>> [  4]  0.0-10.0 sec  87.4 MBytes  73.0 Mbits/sec
>> [  5] local 106.122.1.113 port 5001 connected with 106.122.1.121 port
>> 60514
>>
>>
>> But it seems after certain time of inactivity (low load) speed will be
>> up again...
>>
>> It happens almost the same way on desktop machines and also on Samsung
>> Series 7 laptop NP770Z5E...
>>
>> Does anyone have any ideas about it?
>>
>
> The card flipping back and forth between 1000 and 100 Mbit/s operation
> perhaps?
>
> rick jones


I do not see any link speed changes... it stays the same...
The same problem is visible on absolutely different computers.

-- 
Thanks,
Dmitry
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html