netdev - Re: gso: Handle new frag_list of frags GRO packets

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Date:	Tue, 12 Nov 2013 18:45:04 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	David Miller <davem@...emloft.net>,
	christoph.paasch@...ouvain.be, netdev@...r.kernel.org,
	hkchu@...gle.com, mwdalton@...gle.com
Subject: Re: gso: Handle new frag_list of frags GRO packets

On Wed, 2013-11-13 at 10:25 +0800, Herbert Xu wrote:

> So a better test for the time being would be to test with TSO
> disabled in both cases.
> 

GRO on, TSO off, little difference between two cases :

(Note some small things run in background, so these numbers are not
ultra precise)

1) Full size GRO packets (frag_list enabled)

lpaa6:~# mpstat -P 3 1 10
06:39:32 PM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest   %idle    intr/s
06:39:33 PM    3    3.23    0.00   43.55    0.00   12.90    0.00    0.00    0.00   40.32 123209.68
06:39:34 PM    3    3.39    0.00   28.81    0.00   16.95    0.00    0.00    0.00   50.85  84559.32
06:39:35 PM    3    1.79    0.00    3.57    0.00   10.71    0.00    0.00    0.00   83.93 108898.21
06:39:36 PM    3    3.39    0.00   30.51    0.00   16.95    0.00    0.00    0.00   49.15  84661.02
06:39:37 PM    3    0.00    0.00    7.46    0.00   10.45    0.00    0.00    0.00   82.09  72135.82
06:39:38 PM    3    1.56    0.00   26.56    0.00    9.38    0.00    0.00    0.00   62.50  73562.50
06:39:39 PM    3    0.00    0.00    8.47    0.00   15.25    0.00    0.00    0.00   76.27  75715.25
06:39:40 PM    3    8.33    0.00    8.33    0.00    2.08    0.00    0.00    0.00   81.25 129195.83
06:39:41 PM    3    1.56    0.00   23.44    0.00   23.44    0.00    0.00    0.00   51.56  73389.06
06:39:42 PM    3    0.00    0.00    1.96    0.00   17.65    0.00    0.00    0.00   80.39 102474.51
Average:       3    2.21    0.00   18.85    0.00   13.75    0.00    0.00    0.00   65.20  91433.11

2) No frag_list skbs

lpaa6:~# mpstat -P 3 1 10
06:39:56 PM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest   %idle    intr/s
06:39:57 PM    3    0.00    0.00    2.63    0.00   26.32    0.00    0.00    0.00   71.05 173105.26
06:39:58 PM    3    3.85    0.00   13.46    0.00   15.38    0.00    0.00    0.00   67.31 121346.15
06:39:59 PM    3    9.09    0.00   18.18    0.00   14.55    0.00    0.00    0.00   58.18  84216.36
06:40:00 PM    3    0.00    0.00   10.53    0.00   10.53    2.63    0.00    0.00   76.32 170863.16
06:40:01 PM    3    3.45    0.00   20.69    0.00   18.97    0.00    0.00    0.00   56.90  83941.38
06:40:02 PM    3    0.00    0.00    5.88    0.00   19.61    0.00    0.00    0.00   74.51 125625.49
06:40:03 PM    3    1.85    0.00   24.07    0.00   16.67    0.00    0.00    0.00   57.41  88242.59
06:40:04 PM    3    3.33    0.00   13.33    0.00   13.33    0.00    0.00    0.00   70.00  74181.67
06:40:05 PM    3    0.00    0.00   10.00    0.00   16.00    2.00    0.00    0.00   72.00 150906.00
06:40:06 PM    3    3.28    0.00   44.26    0.00   14.75    0.00    0.00    0.00   37.70  79821.31
Average:       3    2.71    0.00   17.41    0.00   16.44    0.39    0.00    0.00   63.06 110094.00


> In the mean time I'm cooking up a patch to generate TSO packets.

That would be very nice !

Thanks


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