Fabian Hugelshofer wrote:
It took me some time to set up profiling on the router. I am using
oprofile. nf_conntrack and nfnetlink are built into the kernel. Most of
the time is probably spent in nfnetlink.
If you need other data than the one provided here, just let me know. I'm
not very familiar with oprofile, so providing the needed arguments would
be helpful.
Thanks.
opreport --symbols (first 20, full file attached):
CPU: ARM/XScale PMU2, speed 0 MHz (estimated)
Counted CPU_CYCLES events (clock cycles counter) with a unit mask of
0x00 (No unit mask) count 100000
samples % app name symbol name
20018 9.6520 vmlinux memcpy
Callgraph information would be useful since its unclear whether
this is the memcpy triggered by netlink message trimming in
af_netlink.c or something different. Unfortunately according
to the documentation this is only supported on x86. I think
selecting the netfilter options as modules should provide
slightly more detail though.
19493 9.3988 ath_pci.ko ath_sysctl_register
This looks odd. I couldn't find this function in the current
kernel tree, which version are you using?
6676 3.2189 vmlinux __nf_conntrack_find
6098 2.9402 vmlinux ipt_do_table
5858 2.8245 wlan.ko ieee80211_input
5383 2.5955 nf_conntrack_netlink.ko .text
4567 2.2020 vmlinux __memzero
4225 2.0371 vmlinux __kmalloc
4091 1.9725 vmlinux csum_partial
You can disable conntrack checksumming by executing:
echo 0 >/proc/sys/net/netfilter/nf_conntrack_checksum
3469 1.6726 vmlinux nf_nat_setup_info
3468 1.6721 vmlinux netlink_broadcast
3376 1.6278 vmlinux __hash_conntrack
3304 1.5931 vmlinux nla_put
2992 1.4426 vmlinux __nla_reserve
2933 1.4142 vmlinux __nf_conntrack_confirm
2926 1.4108 oprofiled /jffs/usr/bin/oprofiled
2847 1.3727 ath_pci.ko ath_intr
2698 1.3009 vmlinux kfree
2655 1.2801 vmlinux __nla_put
2563 1.2358 vmlinux nf_conntrack_in
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