That could be a kernel limitation. What kernel are you running? Todd Fujinaka Software Application Engineer Networking Division (ND) Intel Corporation todd.fujin...@intel.com (503) 712-4565
-----Original Message----- From: Derek Ditch [mailto:de...@criticalstack.com] Sent: Tuesday, June 21, 2016 10:57 AM To: Skidmore, Donald C <donald.c.skidm...@intel.com> Cc: e1000-devel@lists.sourceforge.net Subject: Re: [E1000-devel] Support for Symmetric RSS Hashing? Don, Thanks for the suggestion. I hadn’t noticed the “hkey” argument to ethtool -X before. However, it appears my hardware doesn’t support it (though I could be doing it wrong). sudo ethtool -X ens5 hkey 6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A Cannot get RX flow hash indir size and key size: Operation not supported $ sudo lspci -nn -s 05 -v 00:05.0 Ethernet controller [0200]: Intel(R) 82599 10 Gigabit Dual Port Network Connection [8086:10fb] (rev 01) Subsystem: Hewlett-Packard Company HP Ethernet 10Gb 2-port 560SFP+ Adapter [103c:17d3] Physical Slot: 5 Flags: bus master, fast devsel, latency 0, IRQ 10 Memory at fea00000 (32-bit, non-prefetchable) [size=1M] I/O ports at c080 [size=32] Memory at febd0000 (32-bit, non-prefetchable) [size=16K] Expansion ROM at feb00000 [disabled] [size=512K] Capabilities: [40] Power Management version 3 Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+ Capabilities: [70] MSI-X: Enable+ Count=64 Masked- Capabilities: [a0] Express Endpoint, MSI 00 Capabilities: [e0] Vital Product Data Kernel driver in use: ixgbe This NIC is passed through as a physical function via SR-IOV, but it doesn’t seem to work on the host either. — Derek Ditch de...@criticalstack.com GPG: 0x2543A3B5 > On 20Jun 2016, at 11:50, Skidmore, Donald C <donald.c.skidm...@intel.com> > wrote: > > Hey Derek, > > Why can't you just change the RSS hash key to whatevery you want it to be via > ethtool -X? > > Thanks, > -Don Skidmore <donald.c.skidm...@intel.com> > > >> -----Original Message----- >> From: Derek Ditch [mailto:de...@criticalstack.com] >> Sent: Sunday, June 19, 2016 9:20 PM >> To: e1000-devel@lists.sourceforge.net >> Subject: [E1000-devel] Support for Symmetric RSS Hashing? >> >> I’ve been using and recommending Intel NICs for years for network >> sensor platforms. I’m a huge user of Bro (http://bro.org >> <http://bro.org/>) and also leveraged Suricata for signature-based >> detections. Lately, I’ve started working with trying to get away from >> PF_RING as my hardware interface layer due to additional >> complications of out-of-kernel bolt-ons. I’ve really enjoyed the >> performance achieved using AF_PACKET for applications that support >> it. In Bro (and Suricata and now netsniff-ng), in order to support >> FANOUT_HASH mode provided by the kernel, the packets are spread across >> multiple processes. The problem is that these applications need symmetric >> hashing of the connections. >> The current ixgbe driver does not provide this guarantee in its RSS hashing. >> Recent changes in the kernel further made this a problem by accepting >> the hardware calculated hash, when available (for performance >> reasons, this would be great, unless you needed symmetric hashing). >> >> I ran across several discussions where an ixgbe driver was patched to >> support this, and also ran across this blog post [1] that used DPDK >> to override the driver hash. Can we just update the hash key in the >> mainline driver so that we get both good distribution of connections >> and symmetric hashing? It basically comes down to swapping out the >> hash key to ensure the first 32-bits (src ip) match the second >> 32-bits (dst ip) and the next 16-bits (src port) match the following >> 16-bits (dst port). A published paper provides a key change that >> modifies the standard Toeplitz hash function, which does not provide these >> guarantees. >> >> So… Can we just have a better hash function in hardware (via the >> driver) that feeds RSS (and now AF_PACKET)? >> >> Thanks! >> >> [1] http://galsagie.github.io/2015/02/26/dpdk-tips-1/ >> <http://galsagie.github.io/2015/02/26/dpdk-tips-1/> >> — >> Derek Ditch >> de...@criticalstack.com >> GPG: 0x2543A3B5 > ------------------------------------------------------------------------------ Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. This family event has something for everyone, including kids. Get more information and register today. http://sdm.link/attshape _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
