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    Subjecttuning linux for high network performance?
    Date
    hi

    I've got this video server serving video for VoD. problem is the P4 1.8 seems
    to be maxed out by a few system calls. The below output is for ~50 clients
    streaming at ~4.5Mbps. if trying to increase this to ~70, the CPU maxes out.

    Does anyone have an idea?

    bash-2.05# readprofile | sort -rn +2 | head -30
    154203 default_idle 2409.4219
    212723 csum_partial_copy_generic 916.9095
    100164 handle_IRQ_event 695.5833
    24979 system_call 390.2969
    37300 e1000_intr 388.5417
    119699 ide_intr 340.0540
    30598 skb_release_data 273.1964
    40740 do_softirq 195.8654
    131818 do_wp_page 164.7725
    9935 fget 155.2344
    24747 kfree 154.6687
    10911 del_timer 113.6562
    11683 ip_conntrack_find_get 91.2734
    4120 sock_poll 85.8333
    9357 ip_ct_find_proto 83.5446
    5194 sock_wfree 81.1562
    4929 add_wait_queue 77.0156
    8361 flush_tlb_page 74.6518
    4571 remove_wait_queue 71.4219
    2191 __brelse 68.4688
    29477 skb_clone 68.2338
    8562 do_gettimeofday 59.4583
    5673 process_timeout 59.0938
    11097 tcp_v4_send_check 57.7969
    6124 kfree_skbmem 54.6786
    17115 tcp_poll 53.4844
    21130 nf_hook_slow 52.8250
    8299 ip_ct_refresh 51.8687
    15429 __kfree_skb 50.7533
    1059 lru_cache_del 46.0435


    roy
    --
    Roy Sigurd Karlsbakk, Datavaktmester
    ProntoTV AS - http://www.pronto.tv/
    Tel: +47 9801 3356

    Computers are like air conditioners.
    They stop working when you open Windows.

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