Laurent, btw, have you gived netperf test a try? It is a commonly-used tool to measure network performance, and has dozens of settings to test...
On Tue, 14 Feb 2006 11:17:46 -0500 Pantelis Antoniou <pantelis.antoniou at gmail.com> wrote: > Can you provide some more information? > > Actual timings, and a tcpdump fragment? > > On 2/14/06, Laurent Lagrange <lagrange at fr.oleane.com> wrote: > > > > Hi Pantelis, > > > > Thanks for the express reply. > > > > I know that what I say seems incredible. But I don't understand what NAPI > > does. > > My measure is very simple. I display a message on the client when 1000 > > exchanges are done. > > I already check the ifconfig stats on the board after some seconds. > > The measures seems the same with or without NAPI. > > > > More details ? > > Thanks again > > Laurent > > > > > > > > -----Message d'origine----- > > *De :* Pantelis Antoniou [mailto:pantelis.antoniou at gmail.com] > > *Envoy? :* mar. 14 f?vrier 2006 16:29 > > *? :* Laurent Lagrange > > *Cc :* linuxppc-embedded at ozlabs.org > > *Objet :* Re: Gianfar is slower than fcc_enet on MPC8541 ??? > > > > Hi Laurent, > > > > I found that pretty hard to believe. > > > > What are you measuring exactly? > > > > Speed of replies? If so it's explainable since the TSECs use > > NAPI. > > > > Regards > > > > Pantelis > > > > On 2/14/06, Laurent Lagrange <lagrange at fr.oleane.com> wrote: > > > > > > > > > Hello, > > > > > > I work on a cutom MPC8541 board with Linux 2.6.9. > > > The kernel activates the L1 cache (instructions and data) > > > and the L2 cache (entirely used as cache and not as sram). > > > > > > I configure > > > 1 FCC (FCC1), > > > 2 TSECs with or without NAPI (no effect) but without stashing in L2 > > > sram. > > > All PHYs are automatically configured in 100MB full duplex. > > > > > > eth0: Gianfar Ethernet Controller Version 1.1, 00:10:cd:48:48:e0 > > > eth0: Running with NAPI disabled > > > eth0: 64/64 RX/TX BD ring size > > > eth1: Gianfar Ethernet Controller Version 1.1, 00:10:cd:48:48:e1 > > > eth1: Running with NAPI disabled > > > eth1: 64/64 RX/TX BD ring size > > > eth2: FCC ENET Version custom, 00:10:cd:48:48:e2 > > > > > > Then I launch 3 simple TCP servers, one on each ports. > > > > > > From remote machines I runs 3 TCP clients. > > > The client sends messages of 1000 bytes, > > > The server receives and echoes the message > > > The client receives the echoed message, check the content > > > and sends a new message again. > > > > > > The result is that the 2 TSECs are 2 times slower than the FCC. > > > > > > If I run a "top" application on the board, I use less than 10% of the > > > CPU > > > Each port consumes about 1/3 of the CPU. > > > > > > Any idea on how to configure the gianfar driver ? > > > > > > Thanks > > > Laurent > > > > > > > > > _______________________________________________ > > > Linuxppc-embedded mailing list > > > Linuxppc-embedded at ozlabs.org > > > https://ozlabs.org/mailman/listinfo/linuxppc-embedded > > > > > > > -- Sincerely, Vitaly
