From: Ben Greear <greearb@candelatech.com>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: shemminger@vyatta.com, netdev@vger.kernel.org
Subject: Re: Why is LRO off by default on ixgbe?
Date: Fri, 25 Sep 2009 14:53:48 -0700 [thread overview]
Message-ID: <4ABD3BEC.8040006@candelatech.com> (raw)
In-Reply-To: <20090925214303.GA3399@gondor.apana.org.au>
On 09/25/2009 02:43 PM, Herbert Xu wrote:
> On Fri, Sep 25, 2009 at 02:37:27PM -0700, Herbert Xu wrote:
>>
>>> Ok. It seems GRO was enabled the whole time, but LRO is what gave me the
>>> extra performance boost.
>>>
>>> In this particular case, I'm not actually routing, though I do have ip-forward
>>> enabled, so I guess LRO will be OK as long as I'm careful...
>>
>> What? A driver is either GRO or LRO, it can't be both. What
>> kernel version was this?
>
> Oh perhaps you mean LRO performed by hardware? That would make
> sense indeed. It's also one of the reasons why we hope the hardware
> folks would switch over to GRO so we can enable it for everyone :)
I assume it's in hardware. I am using ixgbe driver, 82599 chipset,
2.6.31 kernel.
GRO was showing as enabled the whole time in ethtool. Turning on LRO gave me an extra
6Gbps (from 12Gbps -> 18Gbps) receive throughput, so it certainly had some affect!
Thanks,
Ben
--
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc http://www.candelatech.com
prev parent reply other threads:[~2009-09-25 21:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-23 16:29 Why is LRO off by default on ixgbe? Ben Greear
2009-09-23 16:53 ` Stephen Hemminger
2009-09-23 16:57 ` Ben Greear
2009-09-23 17:07 ` Stephen Hemminger
2009-09-23 17:16 ` Ben Greear
2009-09-25 21:37 ` Herbert Xu
2009-09-25 21:43 ` Herbert Xu
2009-09-25 21:53 ` Ben Greear [this message]
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