netdev - RE: [PATCH 2.6.34-rc6] net: Improve ks8851 snl transmit performance

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Date:	Thu, 13 May 2010 18:39:35 -0500
From:	"Arce, Abraham" <x0066660@...com>
To:	"Ha, Tristram" <Tristram.Ha@...rel.com>,
	Ben Dooks <ben@...tec.co.uk>
CC:	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Jan, Sebastien" <s-jan@...com>
Subject: RE: [PATCH 2.6.34-rc6] net: Improve ks8851 snl transmit performance

Tristram,

> The latest nuttcp default size for UDP is 1500 bytes, rather than 8192 bytes.
> In my case, the transmit performance improves from 10 Mbps to 11.  Have you
> tried TCP?
> 

Not yet... one point to highlight before:

  - SPI controller clock rate is 24 MHz, unable to set ~40 MHz, 

Now testing in 2.6.34 rc7 using now TCP, nuttcp version 6.1.2:

Before the patch

  # /testsuites/ethernet/bin/nuttcp -i -Ri50m 10.87.231.229
      1.1460 MB /   1.00 sec =    9.6134 Mbps
      1.1858 MB /   1.00 sec =    9.9473 Mbps
      1.2258 MB /   1.00 sec =   10.2828 Mbps
      1.1996 MB /   1.00 sec =   10.0628 Mbps
      1.2203 MB /   1.00 sec =   10.2365 Mbps
      1.2258 MB /   1.00 sec =   10.2828 Mbps
      1.2134 MB /   1.00 sec =   10.1786 Mbps
      1.2235 MB /   1.00 sec =   10.2636 Mbps
      1.2134 MB /   1.00 sec =   10.1785 Mbps
      1.2120 MB /   1.00 sec =   10.1670 Mbps

     12.6250 MB /  10.46 sec =   10.1240 Mbps 2 %TX 0 %RX 0 retrans 7.91 msRTT

  # /testsuites/ethernet/bin/nuttcp 10.87.231.229
     12.9319 MB /  10.58 sec =   10.2553 Mbps 1 %TX 0 %RX 0 retrans 7.90 msRTT

After the patch

  # /testsuites/ethernet/bin/nuttcp -i -Ri50m 10.87.231.229
      1.1671 MB /   1.00 sec =    9.7902 Mbps
      1.2169 MB /   1.00 sec =   10.2077 Mbps
      1.2175 MB /   1.00 sec =   10.2134 Mbps
      1.2396 MB /   1.00 sec =   10.3986 Mbps
      1.2396 MB /   1.00 sec =   10.3987 Mbps
      1.2387 MB /   1.00 sec =   10.3910 Mbps
      1.2410 MB /   1.00 sec =   10.4102 Mbps
      1.2203 MB /   1.00 sec =   10.2365 Mbps
      1.2382 MB /   1.00 sec =   10.3871 Mbps
      1.2369 MB /   1.00 sec =   10.3755 Mbps

     12.8125 MB /  10.45 sec =   10.2820 Mbps 2 %TX 0 %RX 0 retrans 7.90 msRTT

  # /testsuites/ethernet/bin/nuttcp 10.87.231.229
     13.0808 MB /  10.64 sec =   10.3123 Mbps 1 %TX 0 %RX 0 retrans 7.90 msRTT

Best Regards
Abraham

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