Date: Mon, 1 Jun 2009 09:43:58 +0000 (UTC) From: Robert Watson <rwatson@FreeBSD.org> To: src-committers@freebsd.org, svn-src-projects@freebsd.org Subject: svn commit: r193215 - projects/pnet/sys/netinet Message-ID: <200906010943.n519hwH8071609@svn.freebsd.org>
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Author: rwatson Date: Mon Jun 1 09:43:58 2009 New Revision: 193215 URL: http://svn.freebsd.org/changeset/base/193215 Log: When cheaply calculating flow identifiers for packets coming in from network device drivers without hardware flow calculation, or for loopback traffic, use a different cheap hash that puts all interesting entropy into the bottom 8 bits of the flow ID, which works well with our default flow ID -> CPU mapping. Modified: projects/pnet/sys/netinet/ip_input.c Modified: projects/pnet/sys/netinet/ip_input.c ============================================================================== --- projects/pnet/sys/netinet/ip_input.c Mon Jun 1 09:32:12 2009 (r193214) +++ projects/pnet/sys/netinet/ip_input.c Mon Jun 1 09:43:58 2009 (r193215) @@ -442,7 +442,10 @@ ip_input_m2flow(struct mbuf *m, uintptr_ goto bad; } m->m_flags |= M_FLOWID; - m->m_pkthdr.flowid = ip->ip_src.s_addr ^ ip->ip_dst.s_addr; + m->m_pkthdr.flowid = ((ip->ip_src.s_addr & 0xff000000) >> 24) ^ + ((ip->ip_src.s_addr & 0xff0000) >> 16) ^ + ((ip->ip_src.s_addr & 0xff00) >> 8) ^ + (ip->ip_src.s_addr & 0xff) ^ ip->ip_p; return (m); bad:
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