From: Ben Greear <greearb@candelatech•com>
To: Stephen Hemminger <shemminger@vyatta•com>
Cc: Simon Chen <simonchennj@gmail•com>,
Ben Hutchings <bhutchings@solarflare•com>,
netdev@vger•kernel.org
Subject: Re: under-performing bonded interfaces
Date: Wed, 21 Dec 2011 19:31:06 -0800 [thread overview]
Message-ID: <4EF2A47A.3010006@candelatech.com> (raw)
In-Reply-To: <20111221173608.0f04bc8b@nehalam.linuxnetplumber.net>
On 12/21/2011 05:36 PM, Stephen Hemminger wrote:
> On Wed, 21 Dec 2011 20:26:04 -0500
> Simon Chen<simonchennj@gmail•com> wrote:
>
>> Hi folks,
>>
>> I added an Intel X520 card to both the sender and receiver... Now I
>> have two 10G ports on a PCIe 2.0 x8 slot (5Gx8), so the bandwidth of
>> the PCI bus shouldn't be the bottleneck.
>>
>> Now the throughput test gives me around 16Gbps in aggregate. Any ideas
>> how I can push closer to 20G? I don't quite understand where the
>> bottleneck is now.
>
> In my experience, Intel dual port cards can not run at full speed
> when both ports are in use. You need separate slots to hit full
> line rate.
We can run 2 ports right at 10Gbps tx + rx using a core-i7 980x
processor and 5gt/s pci-e bus. This is using a modified version of
pktgen to generate traffic. We can only push around 6 Gbps tx + rx
when generating tcp traffic to/from user-space, but our tcp generator
is not as optimized for bulk transfer as it could be.
Thanks,
Ben
--
Ben Greear <greearb@candelatech•com>
Candela Technologies Inc http://www.candelatech.com
next prev parent reply other threads:[~2011-12-22 3:31 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-16 23:44 under-performing bonded interfaces Simon Chen
2011-11-17 0:01 ` Ben Greear
2011-11-17 0:05 ` Simon Chen
2011-11-17 0:07 ` Ben Greear
2011-11-17 0:57 ` Ben Hutchings
2011-11-17 1:38 ` Simon Chen
2011-11-17 1:45 ` Simon Chen
2011-11-17 1:45 ` Rick Jones
2011-11-17 2:51 ` Ben Hutchings
2011-12-22 1:26 ` Simon Chen
2011-12-22 1:36 ` Stephen Hemminger
2011-12-22 3:31 ` Ben Greear [this message]
2011-12-22 2:28 ` Simon Chen
2011-12-22 5:43 ` Eric Dumazet
2011-12-23 15:03 ` Simon Chen
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