Hey Derek,
Support for the hkey argument isn’t really a HW thing as much as having
software able to do it. I would update your ethtool and drivers and see if
that helps.
Thanks,
-Don Skidmore <donald.c.skidm...@intel.com>
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<mailto:de...@criticalstack.com>
GPG: 0x2543A3B5
On 20Jun 2016, at 11:50, Skidmore, Donald C
<donald.c.skidm...@intel.com<mailto: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<mailto: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<mailto: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<mailto:de...@criticalstack.com>
GPG: 0x2543A3B5
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