netdev - Re: throughput problems with realtek

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Date:	Thu, 16 Jan 2014 09:45:57 +0200
From:	Dmitry Kasatkin <dmitry.kasatkin@...il.com>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	Rick Jones <rick.jones2@...com>, nic_swsd@...ltek.com,
	netdev@...r.kernel.org, l.moiseichuk@...sung.com
Subject: Re: throughput problems with realtek

On Thu, Jan 16, 2014 at 1:51 AM, Francois Romieu <romieu@...zoreil.com> wrote:
> Dmitry Kasatkin <dmitry.kasatkin@...il.com> :
> [...]
>> I do not see any link speed changes... it stays the same...
>> The same problem is visible on absolutely different computers.
>
> No netdev watchdog message either ?
>
> A serving 8168c does not seem to fluctuate (3.12.5, Intel 82578 client).
> My hardware is a bit old though. Please send XID message from the r8169
> driver. It should be seen in dmesg.
>
> Thanks.
>
> --
> Ueimor

Hi,

No watchdog messages. I also do not see any changes in the led on the
switch which indicates changes in the link speed.

Also as you say.. speed drop first to 140MBs so it is still higher than 100MBs

This what I have in dmesg...

[    2.005555] r8169 0000:03:00.0: irq 45 for MSI/MSI-X
[    2.005690] r8169 0000:03:00.0 eth0: RTL8168evl/8111evl at
0xffffc90000040000, 18:67:b0:2c:0f:ef, XID 0c900800 IRQ 45
[    2.005691] r8169 0000:03:00.0 eth0: jumbo features [frames: 9200
bytes, tx checksumming: ko]

Is it that XID or something else..

I have a problem on Gygabyte Celleron 1007U integrated board and also
on Samsung Series 7 laptop.
My colleague has the same on his Series 7 laptop.

One thing.. I had similar problem with Intel network card. It was
fixed using module parameter...

modprobe e1000e InterruptThrottleRate=0

Are there any network speed or irq throttling in kernel/driver?

-- 
Thanks,
Dmitry
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