Jim please see inline On Sep 11, 2012, at 12:02 AM, Jim Lloyd <[email protected]> wrote:
> Hi Alfredo. Our 10GigE interfaces are already configured with ixgbe drivers. > Are there changes in the ixgbe driver sources that come with the PF_RING > distribution that we must use, or can we use the installed drivers? If you don't want to use the DNA drivers, you can either: - use your standard drivers - or use the PF_RING-aware drivers you can find in PF_RING/drivers/PF_RING_aware (in this case you can increase the performance loading pf_ring.ko with transparent_mode=2) > I am inspecting the load_dna_driver.sh script for ixgbe, but I would > appreciate it if you could provide more specifics. Assuming our 10GigE nic is > configured as device eth2, and I want to have 4 RX queues, what steps would I > take? According to the latest ixgbe drivers, you should use: insmod ./ixgbe.ko MQ=1,1,1,1 RSS=4,4,4,4 > From other reading I have done, I think it is clear that I will need to > ensure that the hashing used for the RSS is flow based, i.e. both sides of a > TCP conversation must be directed to the same queue. Symmetric RSS is supported with DNA drivers only at the moment. Alfredo > > Thanks. > > On Mon, Sep 10, 2012 at 1:52 PM, Alfredo Cardigliano <[email protected]> > wrote: > Hi Jim > please see inline > > On Sep 10, 2012, at 10:30 PM, Jim Lloyd <[email protected]> wrote: > > > Greetings, > > > > We have an existing libpcap application which analyzes http traffic. The > > application uses one sniffer thread per device, copies each packet, and > > then queues those packets for consumption by N worker threads. The > > architecture has served us well but we are encountering use cases where one > > sniffer thread per device is the clear bottleneck. > > > > It seems clear to us that we would benefit from using PF_RING and may want > > to rewrite our application to use DNA+libzero. But before we start that > > effort, we'd like to take the baby step of recompiling our application with > > libpcap-1.1.1-ring and seeing what performance gains can be obtained. > > > > From the documentation, it seems that we should be able to configure 4 RX > > queues, and then configure our application to sniff from those 4 queues as > > if they were different ethernet devices. And if the 10GigE device is eth2, > > the device names we would pass to libpcap would be eth2@0 .. eth2@3. Is > > that correct? > > Correct. Actually it depends on the drivers you are using: standard, > PF_RING-aware, or DNA (in the latter case the device name will be dnaX@Y) > > > Finally, I haven't seen exactly how one configures these 4 RX queues. Can > > someone please point me at the documentation for that configuration? > > This depends on the drivers and card model you have. A modinfo <driver> > should be enough in most cases, if you are using DNA drivers you can also > have a look at the load_dna_driver.sh inside the > PF_RING/drivers/DNA/<model>-<version>-DNA/src folder. > Once the driver is loaded, you can use ethtool to check the card > configuration (e.g. with "ethtool -S eth2" you can see per-queue stats) > > Best Regards > Alfredo > > > > > Thanks. > > > > _______________________________________________ > > Ntop-misc mailing list > > [email protected] > > http://listgateway.unipi.it/mailman/listinfo/ntop-misc > > _______________________________________________ > Ntop-misc mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop-misc > > _______________________________________________ > Ntop-misc mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop-misc
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