From: Rick Jones <rick.jones2@hp•com>
To: Bill Fink <billfink@mindspring•com>
Cc: jagana@us•ibm.com, herbert@gondor•apana.org.au,
gaagaan@gmail•com, Robert.Olsson@data•slu.se,
mcarlson@broadcom•com, rdreier@cisco•com,
peter.p.waskiewicz.jr@intel•com, hadi@cyberus•ca,
kaber@trash•net, jeff@garzik•org, general@lists•openfabrics.org,
mchan@broadcom•com, tgraf@suug•ch, netdev@vger•kernel.org,
johnpol@2ka•mipt.ru, shemminger@linux-foundation•org,
David Miller <davem@davemloft•net>,
sri@us•ibm.com
Subject: [ofa-general] Re: [PATCH 0/9 Rev3] Implement batching skb API and support in IPoIB
Date: Fri, 24 Aug 2007 11:46:26 -0700 [thread overview]
Message-ID: <46CF2782.6060006@hp.com> (raw)
In-Reply-To: <20070823231820.2ae52cc0.billfink@mindspring.com>
Bill Fink wrote:
> On Thu, 23 Aug 2007, Rick Jones wrote:
>
>
>>jamal wrote:
>>
>>>[TSO already passed - iirc, it has been
>>>demostranted to really not add much to throughput (cant improve much
>>>over closeness to wire speed) but improve CPU utilization].
>>
>>In the one gig space sure, but in the 10 Gig space, TSO on/off does make a
>>difference for throughput.
>
>
> Not too much.
>
> TSO enabled:
>
> [root@lang2 ~]# ethtool -k eth2
> Offload parameters for eth2:
> rx-checksumming: on
> tx-checksumming: on
> scatter-gather: on
> tcp segmentation offload: on
>
> [root@lang2 ~]# nuttcp -w10m 192.168.88.16
> 11813.4375 MB / 10.00 sec = 9906.1644 Mbps 99 %TX 80 %RX
>
> TSO disabled:
>
> [root@lang2 ~]# ethtool -K eth2 tso off
> [root@lang2 ~]# ethtool -k eth2
> Offload parameters for eth2:
> rx-checksumming: on
> tx-checksumming: on
> scatter-gather: on
> tcp segmentation offload: off
>
> [root@lang2 ~]# nuttcp -w10m 192.168.88.16
> 11818.2500 MB / 10.00 sec = 9910.0176 Mbps 100 %TX 78 %RX
>
> Pretty negligible difference it seems.
Leaves one wondering how often more than one segment was sent to the card in the
9000 byte case :)
rick jones
next prev parent reply other threads:[~2007-08-24 18:46 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-17 6:06 [PATCH 0/9 Rev3] Implement batching skb API and support in IPoIB Krishna Kumar2
2007-08-21 7:18 ` David Miller
2007-08-21 12:30 ` [ofa-general] " jamal
2007-08-21 18:51 ` David Miller
2007-08-21 21:09 ` jamal
2007-08-21 22:50 ` David Miller
2007-08-22 4:11 ` [ofa-general] " Krishna Kumar2
2007-08-22 4:22 ` David Miller
2007-08-22 7:03 ` Krishna Kumar2
2007-08-22 9:14 ` David Miller
2007-08-23 2:43 ` Krishna Kumar2
2007-08-22 17:09 ` [ofa-general] " Rick Jones
2007-08-22 20:21 ` David Miller
2007-08-23 22:04 ` [ofa-general] " jamal
2007-08-23 22:25 ` jamal
2007-08-23 22:35 ` [ofa-general] " Rick Jones
2007-08-23 22:41 ` jamal
2007-08-24 3:18 ` Bill Fink
2007-08-24 12:14 ` jamal
2007-08-24 18:08 ` Bill Fink
2007-08-24 21:25 ` David Miller
2007-08-24 23:11 ` Herbert Xu
2007-08-25 23:45 ` Bill Fink
2007-08-24 18:46 ` Rick Jones [this message]
2007-08-25 0:42 ` John Heffner
2007-08-26 8:41 ` [ofa-general] " Bill Fink
2007-08-27 1:32 ` John Heffner
2007-08-27 2:04 ` David Miller
2007-08-27 23:23 ` jamal
2007-09-14 7:20 ` [ofa-general] " Bill Fink
2007-09-14 13:44 ` TSO, TCP Cong control etc jamal
2007-09-14 17:24 ` [PATCH 0/9 Rev3] Implement batching skb API and support in IPoIB David Miller
2007-08-23 22:30 ` David Miller
2007-08-23 22:38 ` [ofa-general] " jamal
2007-08-24 3:34 ` Stephen Hemminger
2007-08-24 12:36 ` jamal
2007-08-24 16:25 ` Rick Jones
-- strict thread matches above, loose matches on Subject: below --
2007-08-08 9:31 [ofa-general] " Krishna Kumar
2007-08-08 10:49 ` [ofa-general] " David Miller
2007-08-08 11:09 ` Krishna Kumar2
2007-08-08 22:01 ` [ofa-general] " David Miller
2007-08-09 4:19 ` Krishna Kumar2
2007-08-08 13:42 ` Herbert Xu
2007-08-08 15:14 ` jamal
2007-08-08 20:55 ` Stephen Hemminger
2007-08-08 22:40 ` jamal
2007-08-08 22:22 ` David Miller
2007-08-08 22:53 ` jamal
2007-08-09 3:19 ` Krishna Kumar2
2007-08-14 9:02 ` Krishna Kumar2
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