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Message-ID: <1344148439.9299.1570.camel@edumazet-glaptop> Date: Sun, 05 Aug 2012 08:33:59 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: David Miller <davem@...emloft.net> Cc: netdev <netdev@...r.kernel.org> Subject: [PATCH net-next] net: reorganize IP MIB values From: Eric Dumazet <edumazet@...gle.com> Reduce IP latencies by placing hot MIB IP fields in a single cache line. Signed-off-by: Eric Dumazet <edumazet@...gle.com> --- 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 00bc189..aa02b9e 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 */ -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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