[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <4DD5A5CD.7040303@candelatech.com>
Date: Thu, 19 May 2011 16:20:45 -0700
From: Ben Greear <greearb@...delatech.com>
To: Stephen Hemminger <shemminger@...tta.com>
CC: netdev <netdev@...r.kernel.org>
Subject: Re: TCP funny-ness when over-driving a 1Gbps link.
On 05/19/2011 04:18 PM, Stephen Hemminger wrote:
> On Thu, 19 May 2011 15:47:14 -0700
> Ben Greear<greearb@...delatech.com> wrote:
>
>> I noticed something that struck me as a bit weird today,
>> but perhaps it's normal.
>>
>> I was using our application to create 3 TCP streams from one port to
>> another (1Gbps, igb driver), running through a network emulator.
>> Traffic is flowing bi-directional in each connection.
>>
>> I am doing 24k byte writes per system call. I tried 100ms, 10ms, and 1ms
>> latency (one-way) in the emulator, but behaviour is similar in each case.
>> The rest of this info was gathered with 1ms delay in the emulator.
>>
>> If I ask all 3 connections to run 1Gbps, netstat shows 30+GB in the
>> sending queues and 1+ second latency (user-space to user-space). Aggregate
>> throughput is around 700Mbps in each direction.
>>
>> But, if I ask each of the connections to run at 300Mbps, latency averages
>> 2ms and each connection runs right at 300Mbps (950Mbps or so on the wire).
>>
>> It seems that when you over-drive the link, things back up and perform
>> quite badly over-all.
>>
>> This is a core-i7 3.2Ghz with 12GB RAM, Fedora 14, 2.6.38.6 kernel
>> (with some hacks), 64-bit OS and user-space app. Quick testing on 2.6.36.3
>> showed similar results, so I don't think it's a regression.
>>
>> I am curious if others see similar results?
>>
>> Thanks,
>> Ben
>>
>
> If you overdrive, TCP expects your network emulator to have
> a some but limited queueing (like a real router).
The emulator is fine, it's not being over-driven (and has limited queueing if it was
being over-driven). The queues that are backing up are in the tcp sockets on the
sending machine.
But, just to make sure, I'll re-run the test with a looped back cable...
Ben
>
--
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc http://www.candelatech.com
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists