netdev - Re: Difficulties to get 1Gbps on be2net ethernet card

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Message-ID: <CAL8zT=i9oLEfxuHEG2Dxm6FyHadaoz0HcCvG_zm++QcOxer_LA@mail.gmail.com>
Date:	Wed, 30 May 2012 12:06:28 +0200
From:	Jean-Michel Hautbois <jhautbois@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: Difficulties to get 1Gbps on be2net ethernet card

2012/5/30 Eric Dumazet <eric.dumazet@...il.com>:
> On Wed, 2012-05-30 at 11:40 +0200, Jean-Michel Hautbois wrote:
>
>> I used vmstat in order to see the differences between the two kernels.
>> The main difference is the number of interrupts per second.
>> I have an average of 87500 on 3.2 and 7500 on 2.6, 10 times lower !
>> I suspect the be2net driver to be the main cause, and I checkes the
>> /proc/interrupts file in order to be sure.
>>
>> I have for eth1-tx on 2.6.26 about 2200 interrupts per second and 23000 on 3.2.
>> BTW, it is named eth1-q0 on 3.2 (and tx and rx are the same IRQ)
>> whereas there is eth1-rx0 and eth1-tx on 2.6.26.
>>
>
> Might be different coalescing params :
>
> ethtool -c eth1
>

Yes, as stated in my first e-mail, this is different, in 2.6.26 the
adaptive-tx coalescing is off, while it is on for 3.4 (sorry, I said
3.2 before but it is 3.4).
But I can't change this setting since commit 10ef9ab...
JM
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