netdev - Re: Why is LRO off by default on ixgbe?

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Date:	Wed, 23 Sep 2009 09:57:51 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	NetDev <netdev@...r.kernel.org>
Subject: Re: Why is LRO off by default on ixgbe?

On 09/23/2009 09:53 AM, Stephen Hemminger wrote:
> On Wed, 23 Sep 2009 09:29:59 -0700
> Ben Greear<greearb@...delatech.com>  wrote:
>
>> I just noticed that enabling LRO on ixgbe lets me reach about 9Gbps receive on two
>> NICs concurrently in an NFS test, where I was only getting about 6Gbps w/out it (1500 MTU).
>>
>> Why is LRO disabled by default?
>>
>> Thanks,
>> Ben
>
> LRO is turned off if bridging or routing because of End to End requirements.

That makes sense.

If I know that all interfaces in question can handle TSO and LRO,
I could manually enable LRO w/out risk, right?

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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