From: Ben Greear <greearb@candelatech.com>
To: Eliezer Tamir <eliezer.tamir@linux.intel.com>
Cc: Rick Jones <rick.jones2@hp.com>,
Eliezer Tamir <eliezer.tamir@linux.jf.intel.com>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
Dave Miller <davem@davemloft.net>,
Jesse Brandeburg <jesse.brandeburg@intel.com>,
e1000-devel@lists.sourceforge.net,
Willem de Bruijn <willemb@google.com>,
Andi Kleen <andi@firstfloor.org>, HPA <hpa@zytor.com>,
Eliezer Tamir <eliezer@tamir.org.il>
Subject: Re: [RFC PATCH 0/5] net: low latency Ethernet device polling
Date: Wed, 27 Feb 2013 13:42:41 -0800 [thread overview]
Message-ID: <512E7DD1.1010209@candelatech.com> (raw)
In-Reply-To: <512E6F23.3090003@linux.intel.com>
On 02/27/2013 12:40 PM, Eliezer Tamir wrote:
> On 27/02/2013 21:58, Rick Jones wrote:
>> On 02/27/2013 09:55 AM, Eliezer Tamir wrote:
>>>
>>> Performance numbers:
>>> Kernel Config C3/6 rx-usecs TCP UDP
>>> 3.8rc6 typical off adaptive 37k 40k
>>> 3.8rc6 typical off 0* 50k 56k
>>> 3.8rc6 optimized off 0* 61k 67k
>>> 3.8rc6 optimized on adaptive 26k 29k
>>> patched typical off adaptive 70k 78k
>>> patched optimized off adaptive 79k 88k
>>> patched optimized off 100 84k 92k
>>> patched optimized on adaptive 83k 91k
>>> *rx-usecs=0 is usually not useful in a production environment.
>>
>> I would think that latency-sensitive folks would be using rx-usecs=0 in
>> production - at least if the NIC in use didn't have low enough latency
>> with its default interrupt coalescing/avoidance heuristics.
>
> It will only work well if you have no bulk traffic on the same port as the low latency traffic at all.
Have you done any tests for bulk throughput with busy-poll? Yes, it will eat a core,
but that might be worth it in some cases if there was significant throughput increase...
Thanks,
Ben
--
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc http://www.candelatech.com
next prev parent reply other threads:[~2013-02-27 21:44 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-27 17:55 [RFC PATCH 0/5] net: low latency Ethernet device polling Eliezer Tamir
2013-02-27 17:55 ` [RFC PATCH 1/5] net: implement support for low latency socket polling Eliezer Tamir
2013-03-03 18:35 ` Eric Dumazet
2013-03-03 19:21 ` Andi Kleen
2013-03-03 21:20 ` Eric Dumazet
2013-03-04 3:55 ` Andi Kleen
2013-03-04 8:43 ` Eliezer Tamir
2013-03-04 14:52 ` Eric Dumazet
2013-03-04 15:28 ` Eliezer Tamir
2013-03-04 16:15 ` Eric Dumazet
2013-03-04 7:23 ` Cong Wang
2013-03-05 16:43 ` Ben Hutchings
2013-03-05 17:15 ` Eliezer Tamir
2013-03-05 19:57 ` David Miller
2013-03-05 19:55 ` David Miller
2013-03-05 20:03 ` H. Peter Anvin
2013-02-27 17:56 ` [RFC PATCH 2/5] tcp: add TCP support for low latency receive poll Eliezer Tamir
2013-03-05 17:13 ` Ben Hutchings
2013-02-27 17:56 ` [RFC PATCH 3/5] ixgbe: Add support for ndo_ll_poll Eliezer Tamir
2013-02-27 18:41 ` Eric Dumazet
2013-02-27 19:20 ` Eliezer Tamir
2013-03-05 17:26 ` Ben Hutchings
2013-03-05 17:28 ` Ben Hutchings
2013-03-05 17:36 ` Eric Dumazet
2013-02-27 17:56 ` [RFC PATCH 4/5] ixgbe: add extra stats " Eliezer Tamir
2013-02-27 17:56 ` [RFC PATCH 5/5] ixgbe: kprobes latency test module Eliezer Tamir
2013-02-27 18:07 ` [RFC PATCH 0/5] net: low latency Ethernet device polling Eliezer Tamir
2013-02-27 18:13 ` Stephen Hemminger
2013-02-27 18:47 ` Tom Herbert
2013-02-27 19:17 ` Eliezer Tamir
2013-03-04 22:34 ` Ben Hutchings
2013-02-27 19:58 ` Rick Jones
2013-02-27 20:40 ` Eliezer Tamir
2013-02-27 21:42 ` Ben Greear [this message]
2013-02-28 8:38 ` Eliezer Tamir
2013-03-01 21:24 ` David Miller
2013-03-01 22:57 ` Tom Herbert
2013-03-02 17:02 ` Eliezer Tamir
2013-03-04 7:37 ` Cong Wang
2013-03-04 8:19 ` Eliezer Tamir
2013-03-04 8:46 ` Eliezer Tamir
2013-03-04 17:19 ` Stephen Hemminger
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