svn commit: r268837 - head/sys/netinet

Adrian Chadd adrian at FreeBSD.org
Fri Jul 18 08:22:14 UTC 2014


Author: adrian
Date: Fri Jul 18 08:22:13 2014
New Revision: 268837
URL: http://svnweb.freebsd.org/changeset/base/268837

Log:
  Update the default RSS hash to the Chelsio T5 firmware one - it provides
  markedly better distribution of IPv6 address/ports than the previous key.
  
  The previous key would hash large swaths of the port space for a given
  source/destination IP address to the same low handful of bits, effectively
  mapping them to the same queue.  This made testing very .. special.

Modified:
  head/sys/netinet/in_rss.c

Modified: head/sys/netinet/in_rss.c
==============================================================================
--- head/sys/netinet/in_rss.c	Fri Jul 18 08:08:45 2014	(r268836)
+++ head/sys/netinet/in_rss.c	Fri Jul 18 08:22:13 2014	(r268837)
@@ -149,16 +149,16 @@ SYSCTL_INT(_net_inet_rss, OID_AUTO, base
  *
  * XXXRW: And that we don't randomize it yet!
  *
- * XXXRW: This default is actually the default key from Chelsio T3 cards, as
+ * XXXRW: This default is actually the default key from Chelsio T5 cards, as
  * it offers reasonable distribution, unlike all-0 keys which always
  * generate a hash of 0 (upsettingly).
  */
-static uint8_t	rss_key[RSS_KEYSIZE] = {
+static uint8_t rss_key[RSS_KEYSIZE] = {
+	0xbe, 0xac, 0x01, 0xfa, 0x6a, 0x42, 0xb7, 0x3b,
+	0x80, 0x30, 0xf2, 0x0c, 0x77, 0xcb, 0x2d, 0xa3,
+	0xae, 0x7b, 0x30, 0xb4, 0xd0, 0xca, 0x2b, 0xcb,
 	0x43, 0xa3, 0x8f, 0xb0, 0x41, 0x67, 0x25, 0x3d,
 	0x25, 0x5b, 0x0e, 0xc2, 0x6d, 0x5a, 0x56, 0xda,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 };
 
 /*


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