Hi all
I'm doing some oprofile on a bi athlon, linux-2.6.0-test8 kernel, (with a
copybreak intel e1000 patch, because the machine receives a lot of small (<
30 bytes) messages)
It seems the route cache may/should be tuned, but I dont know how.
The machine receives about 10000 packets/second, from a lot of different IP.
Cpu type: Athlon
Cpu speed was (MHz estimation) : 1991.43
Counter 0 counted CPU_CLK_UNHALTED events (Cycles outside of halt state)
with a unit mask of 0x00 (No unit mask) count
50000
vma samples % symbol name
a0251fd0 6477022 15.6789 rt_garbage_collect
a028b6a0 2692339 6.51731 ipt_do_table
a0254560 1779167 4.30681 ip_route_input
a0251c40 1544801 3.73948 rt_may_expire
a0273370 1119668 2.71037 tcp_v4_rcv
a01f4350 1084883 2.62616 e1000_clean_rx_irq
a013dd70 1048705 2.53859 free_block
a013e120 844766 2.04492 kfree
a0269cc0 600011 1.45244 tcp_rcv_established
a0111c20 540780 1.30906 mark_offset_tsc
a0235d40 536856 1.29956 skb_release_data
a023a9a0 521576 1.26257 net_rx_action
a0259dc0 515115 1.24693 ip_queue_xmit
a023f990 498217 1.20603 dst_alloc
a0260190 487681 1.18052 tcp_sendmsg
a0231fe0 477588 1.15609 sockfd_lookup
a0118c30 459348 1.11194 schedule
a0261bd0 454353 1.09985 tcp_recvmsg
a01070c0 442280 1.07062 default_idle
# grep ip_dst_cache /proc/slabinfo
ip_dst_cache 253051 324840 320 12 1 : tunables 54 27 8 :
slabdata 27070 27070 0
# cat /proc/net/sockstat
sockets: used 246459
TCP: inuse 245501 orphan 591 tw 5639 alloc 247035 mem 74061
UDP: inuse 6
RAW: inuse 0
FRAG: inuse 3 memory 1164
#grep "routing cache hash table " /var/log/syslog
kernel: IP: routing cache hash table of 32768 buckets, 256Kbytes
# cat /proc/meminfo
MemTotal: 3371408 kB
MemFree: 847716 kB
Buffers: 70352 kB
Cached: 91080 kB
SwapCached: 0 kB
Active: 1162512 kB
Inactive: 27360 kB
HighTotal: 1900544 kB
HighFree: 161920 kB
LowTotal: 1470864 kB
LowFree: 685796 kB
SwapTotal: 506008 kB
SwapFree: 506008 kB
Dirty: 2092 kB
Writeback: 0 kB
Mapped: 1038884 kB
Slab: 704636 kB
Committed_AS: 1549704 kB
PageTables: 1412 kB
VmallocTotal: 49144 kB
VmallocUsed: 2380 kB
VmallocChunk: 45896 kB
HugePages_Total: 150
HugePages_Free: 48
Hugepagesize: 4096 kB
Does anybody have a hint, what should I change to lower a bit the CPU used
in kernel land ?
Thanks
Eric Dumazet
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