My host is Ubuntu 8.04, running over VMware, connected to DVEVM by 2 switches.
I agree that this setup may cause network congestion. However, I've ran iperf over DVEVM and the host several times - and the results were pretty much the same. The only thing that made the throughput to change dramatically was switching back and forth between 2.6.29-rc4 and 2.6.28-rc6. How should I debug this issue? Are there any recommended profiling tools for kernel's network performance? Thanks in advance. On Tue, Feb 24, 2009 at 1:39 PM, Subrahmanya, Chaithrika <chaithr...@ti.com> wrote: >> Hi to all, >> >> I've tested Linux kernel 2.6.29-rc4-davinci1 >> (http://git.kernel.org/?p=linux/kernel/git/khilman/linux- >> davinci.git;a=commit;h=582ad6bcceb7c8f0c828e71e810fd40fed7af6c3) >> for Ethernet performance. >> Kernel was compiled was done by CodeSourcery 2008q3 (gcc 4.3.2) using >> davinci_evm_dm644x_defconfig. >> >> After booting, iperf v2.0.4 was run on the target (DVEVM board) and on >> the host PC (Ubuntu 8.04) for ten seconds (using default settings): >> target -> target (over localhost): 190Mbit/s >> host (connecting to) -> target: 31Mbit/s >> target (connecting to) -> host: 71Mbit/s >> >> Do the values above make sense? Can anyone confirm them? > > The PHY layer should not cause any decrease in the performance as it > is used only to access the PHY using the MII. Please provide some more > details like the connection setup used- whether it was on a network > or back to back. The network dynamics will alter the performance. > > Regards, > Chaithrika > >> >> Thanks in advance. >> >> P.S. >> When running the same test on 2.6.28-rc6 (from >> http://git.kernel.org/?p=linux/kernel/git/khilman/linux-davinci.git), >> before PHY was refactored out from davinci_emac, the results were >> better: >> host (connecting to) -> target: 73Mbit/s >> target (connecting to) -> host: 57Mbit/s >> >> _______________________________________________ >> Davinci-linux-open-source mailing list >> Davinci-linux-open-source@linux.davincidsp.com >> http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source _______________________________________________ Davinci-linux-open-source mailing list Davinci-linux-open-source@linux.davincidsp.com http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
