From 14a196807482e6fc74f15fc03176d5c08880588f Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Sat, 4 Aug 2012 20:33:59 +0000 Subject: net: reorganize IP MIB values Reduce IP latencies by placing hot MIB IP fields in a single cache line. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- include/linux/snmp.h | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/include/linux/snmp.h b/include/linux/snmp.h index 00bc189cb39..ad6e3a6bf9f 100644 --- a/include/linux/snmp.h +++ b/include/linux/snmp.h @@ -18,7 +18,14 @@ enum { IPSTATS_MIB_NUM = 0, +/* frequently written fields in fast path, kept in same cache line */ IPSTATS_MIB_INPKTS, /* InReceives */ + IPSTATS_MIB_INOCTETS, /* InOctets */ + IPSTATS_MIB_INDELIVERS, /* InDelivers */ + IPSTATS_MIB_OUTFORWDATAGRAMS, /* OutForwDatagrams */ + IPSTATS_MIB_OUTPKTS, /* OutRequests */ + IPSTATS_MIB_OUTOCTETS, /* OutOctets */ +/* other fields */ IPSTATS_MIB_INHDRERRORS, /* InHdrErrors */ IPSTATS_MIB_INTOOBIGERRORS, /* InTooBigErrors */ IPSTATS_MIB_INNOROUTES, /* InNoRoutes */ @@ -26,9 +33,6 @@ enum IPSTATS_MIB_INUNKNOWNPROTOS, /* InUnknownProtos */ IPSTATS_MIB_INTRUNCATEDPKTS, /* InTruncatedPkts */ IPSTATS_MIB_INDISCARDS, /* InDiscards */ - IPSTATS_MIB_INDELIVERS, /* InDelivers */ - IPSTATS_MIB_OUTFORWDATAGRAMS, /* OutForwDatagrams */ - IPSTATS_MIB_OUTPKTS, /* OutRequests */ IPSTATS_MIB_OUTDISCARDS, /* OutDiscards */ IPSTATS_MIB_OUTNOROUTES, /* OutNoRoutes */ IPSTATS_MIB_REASMTIMEOUT, /* ReasmTimeout */ @@ -42,8 +46,6 @@ enum IPSTATS_MIB_OUTMCASTPKTS, /* OutMcastPkts */ IPSTATS_MIB_INBCASTPKTS, /* InBcastPkts */ IPSTATS_MIB_OUTBCASTPKTS, /* OutBcastPkts */ - IPSTATS_MIB_INOCTETS, /* InOctets */ - IPSTATS_MIB_OUTOCTETS, /* OutOctets */ IPSTATS_MIB_INMCASTOCTETS, /* InMcastOctets */ IPSTATS_MIB_OUTMCASTOCTETS, /* OutMcastOctets */ IPSTATS_MIB_INBCASTOCTETS, /* InBcastOctets */ -- cgit v1.2.3-70-g09d2