netdev - Re: Major network performance regression in 3.7

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Message-ID: <20130106120129.GA22432@1wt.eu>
Date:	Sun, 6 Jan 2013 13:01:29 +0100
From:	Willy Tarreau <w@....eu>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Gallatin <gallatin@...i.com>
Subject: Re: Major network performance regression in 3.7

On Sun, Jan 06, 2013 at 11:25:25AM +0100, Willy Tarreau wrote:
> OK good news here, the performance drop on the myri was caused by a
> problem between the keyboard and the chair. After the reboot series,
> I forgot to reload the firmware so the driver used the less efficient
> firmware from the NIC (it performs just as if LRO is disabled).
> 
> That makes me think that I should try 3.8-rc2 since LRO was removed
> there :-/

Just for the record, I tested 3.8-rc2, and the myri works as fast with
GRO there as it used to work with LRO in previous kernels. The softirq
work has increased from 26 to 48% but there is no performance drop when
using GRO anymore. Andrew has done a good job !

Willy

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