Hi,
I forgot to mention that I've used iperf's TCP throughput test, with the
following settings:
$ iperf -s # for running a TCP server
$ iperf -c {server's IP address} -i 1 # for running a TCP client
Thanks for helping me out,
Pablo.
On Mon, Mar 2, 2009 at 3:54 PM, Subrahmanya, Chaithrika
<[email protected]>wrote:
> > From: Pablo Bitton <[email protected]>
> > Date: Mon, Mar 2, 2009 at 11:52 AM
> > Subject: Re: DM6446 Ethernet MAC performance
> > To: "Subrahmanya, Chaithrika" <[email protected]>
> >
> >
> > Hi,
> >
> > I've found that the issue below can be demonstrated by compiling the
> > following two revisions:
> > http://git.kernel.org/?p=linux/kernel/git/khilman/linux-
> > davinci.git;a=commit;h=73af72ed66644dc3703b0bfd74285f30f1fe408f
> > - before PHY refactoring
> > http://git.kernel.org/?p=linux/kernel/git/khilman/linux-
> > davinci.git;a=commit;h=b2cbe2f96aa420efcd312a1de8f7fd8e511b2a55
> > - after PHY refactoring
> >
> > Build commands used:
> > $ make distclean
> > $ make davinci_dm644x_evm_defconfig
> > $ make uImage
> >
> > The kernels above were loaded to the same EVM, using the same network
> > setup - and had the following performace:
> > 73af72ed66644dc3703b0bfd74285f30f1fe408f - 72Mbit/s (upload)
> > b2cbe2f96aa420efcd312a1de8f7fd8e511b2a55 - 21Mbit/s (upload)
> >
> > This experiment was repeated several times, so probably network
> > congestion is not the reason for performance degradation seen.
> >
>
> I am looking into this issue, will get back to you with my findings.
> I have not observed any large difference in performance numbers
> when I tested it earlier (for UDP). In fact there was some
> improvement for some cases.
>
> Thanks,
> Chaithrika
>
> > Regards,
> > Pablo.
> >
> > On Wed, Feb 25, 2009 at 7:44 PM, Pablo Bitton <[email protected]>
> > wrote:
> > > 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
> > > <[email protected]> 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
> > >>> [email protected]
> > >>> http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-
> > source
> > >
> >
> > _______________________________________________
> > Davinci-linux-open-source mailing list
> > [email protected]
> > http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
>
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