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    Subjectloaded router, excessive getnstimeofday in oprofile
    Date
    I have loaded router (~650 Mbps In+Out), based on 2xAMD Opteron 248, Sun Fire 
    X4100. HPET timer available (TSC seems not available on this platform).
    Network interfaces is onboard, connected over PCI-X.

    Right now i am using only one processor, cause using only one interface and
    interrupts stick to it. Other is almost not used.
    At peak time i notice in mpstat, that this processor is almost "dead", and if
    i run minor application consuming resources - ping over this router will be
    terrible. For me it is clear - system overloaded. I did oprofile, and here is
    result (at low load time, but at peak time it is very similar).

    CPU: AMD64 processors, speed 2193.74 MHz (estimated)
    Counted CPU_CLK_UNHALTED events (Cycles outside of halt state) with a unit
    mask of 0x00 (No unit mask) count 100000
    CPU_CLK_UNHALT...|
    samples| %|
    ------------------
    2679376 71.9851 vmlinux
    287212 7.7163 e1000
    278674 7.4870 ip_tables
    259923 6.9832 nf_conntrack
    29699 0.7979 iptable_nat
    26752 0.7187 nf_nat
    26093 0.7010 nf_conntrack_ipv4
    16525 0.4440 iptable_mangle
    14988 0.4027 oprofiled


    CPU: AMD64 processors, speed 2193.74 MHz (estimated)
    Counted CPU_CLK_UNHALTED events (Cycles outside of halt state) with a unit
    mask of 0x00 (No unit mask) count 100000
    samples % symbol name
    1031727 37.1736 getnstimeofday
    230457 8.3035 __napi_schedule
    122154 4.4013 __do_softirq
    110036 3.9647 dev_queue_xmit
    88800 3.1995 net_rx_action
    71163 2.5640 ip_route_input
    52232 1.8819 local_bh_enable
    43804 1.5783 get_next_timer_interrupt
    43387 1.5633 ip_forward
    35501 1.2791 nf_iterate
    35212 1.2687 __slab_alloc
    34652 1.2485 default_idle
    32375 1.1665 kfree
    28127 1.0134 kmem_cache_alloc

    What is bothering me, why getnstimeofday called so much? Even i remove HTB
    shaper, it still takes 30-40% of whole vmlinux time. From other
    applications - only zebra is running.
    Any ideas?


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