Date: Thu, 21 Feb 2008 12:18:04 +0000 (UTC) From: Vadim Goncharov <vadim_nuclight@mail.ru> To: freebsd-performance@freebsd.org Subject: [curious] interface aliases changing performance Message-ID: <slrnfrqqvr.1hre.vadim_nuclight@hostel.avtf.net>
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Hi!
After looking at humotous quoting about a man trying to ban unused addresses in
his network by putting 65535 ifcong_XXX_aliasYYY lines to rc.conf, I decided to
check this performance issue on a 6.2-RELEASE (GENERIC) and compare it with
Linux. Below are results from two machines.
First, I've found that both FreeBSD and Linux clearly use linked-list insertion
to tail of queue, because time was growing as O(N^2). Then, Linux deleted it
slowly at first, then faster (is it using LIFO?..).
But Linux with iproute2 was 6 times faster on addition (FreeBSD did it ONE HOUR!),
and even more faster on deletion. Why?..
FreeBSD (addition only):
$ cat /usr/local/etc/rc.d/evil_ifconfig.sh
#!/bin/sh
i=0
starttime=$(date +%s)
while [ $i -lt 65534 ]; do
ipa=$(($i % 256))
net=$(($i / 256))
/sbin/ifconfig re0 192.168.$net.$ipa/32 alias
[ $ipa -eq 0 ] && echo $0: starting net $net @ $((`date +%s` - $starttime)) sec | tee -a /root/evil_ifconfig.log
i=$(($i + 1))
done
$ head -n 20 /var/run/dmesg.boot
Copyright (c) 1992-2007 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 6.2-RELEASE #0: Fri Jan 12 11:05:30 UTC 2007
root@dessler.cse.buffalo.edu:/usr/obj/usr/src/sys/SMP
ACPI APIC Table: <GBT GBTUACPI>
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Pentium(R) D CPU 2.80GHz (2813.54-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0xf47 Stepping = 7
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=0x641d<SSE3,RSVD2,MON,DS_CPL,CNTX-ID,CX16,<b14>>
AMD Features=0x20100000<NX,LM>
AMD Features2=0x1<LAHF>
Cores per package: 2
real memory = 1073676288 (1023 MB)
avail memory = 1041485824 (993 MB)
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
$ cat /root/evil_ifconfig.log
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 0 @ 0 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 1 @ 6 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 2 @ 12 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 3 @ 17 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 4 @ 23 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 5 @ 29 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 6 @ 35 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 7 @ 42 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 8 @ 48 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 9 @ 54 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 10 @ 60 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 11 @ 67 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 12 @ 73 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 13 @ 80 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 14 @ 86 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 15 @ 93 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 16 @ 100 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 17 @ 106 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 18 @ 113 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 19 @ 120 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 20 @ 127 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 21 @ 135 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 22 @ 142 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 23 @ 149 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 24 @ 156 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 25 @ 164 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 26 @ 171 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 27 @ 179 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 28 @ 186 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 29 @ 194 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 30 @ 202 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 31 @ 209 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 32 @ 217 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 33 @ 225 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 34 @ 233 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 35 @ 241 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 36 @ 249 sec
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/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 169 @ 1887 sec
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/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 172 @ 1936 sec
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/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 254 @ 3513 sec
/usr/local/etc/rc.d/evil_ifconfig.sh: starting net 255 @ 3535 sec
The same on Linux:
$ cat /root/evil_ifconfig.sh
#!/bin/sh
i=0
starttime=$(date +%s)
while [ $i -lt 65534 ]; do
ipa=$(($i % 256))
net=$(($i / 256))
ip a a 172.18.$net.$ipa/32 dev eth0
[ $ipa -eq 0 ] && echo $0: starting net $net @ $((`date +%s` - $starttime)) sec | tee -a /root/evil_ifconfig.log
i=$(($i + 1))
done
$ cat /proc/cpuinfo # 4 processor machine, showing one node
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU 5150 @ 2.66GHz
stepping : 6
cpu MHz : 2660.033
cache size : 4096 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm
constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
bogomips : 5328.25
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
$ free
total used free shared buffers cached
Mem: 8179404 513200 7666204 0 75896 190356
-/+ buffers/cache: 246948 7932456
Swap: 2104472 0 2104472
$ uname -a
Linux node-7 2.6.16.21-0.8-smp #1 SMP Mon Jul 3 18:25:39 UTC 2006 x86_64 x86_64
x86_64 GNU/Linux
$ cat /root/eveil_ifconfig.log
./evil_ifconfig.sh: starting net 0 @ 0 sec
./evil_ifconfig.sh: starting net 1 @ 0 sec
./evil_ifconfig.sh: starting net 2 @ 1 sec
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./evil_ifconfig.sh: starting net 254 @ 615 sec
./evil_ifconfig.sh: starting net 255 @ 619 sec
./evil_ifconfig.sh 27,29s user 599,00s system 100% cpu 10:23,74 total
Deleting in Linux (modified only one letter, so output looks the same except
times):
$ cat evil_ifconfig.sh
#!/bin/sh
i=0
starttime=$(date +%s)
while [ $i -lt 65534 ]; do
ipa=$(($i % 256))
net=$(($i / 256))
ip a d 172.18.$net.$ipa/32 dev eth0
[ $ipa -eq 0 ] && echo $0: starting net $net @ $((`date +%s` - $starttime)) sec | tee -a /root/evil_ifconfig.log
i=$(($i + 1))
done
$ ./evil_ifconfig.sh
./evil_ifconfig.sh: starting net 0 @ 0 sec
./evil_ifconfig.sh: starting net 1 @ 4 sec
./evil_ifconfig.sh: starting net 2 @ 8 sec
./evil_ifconfig.sh: starting net 3 @ 12 sec
./evil_ifconfig.sh: starting net 4 @ 16 sec
./evil_ifconfig.sh: starting net 5 @ 19 sec
./evil_ifconfig.sh: starting net 6 @ 23 sec
./evil_ifconfig.sh: starting net 7 @ 27 sec
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./evil_ifconfig.sh: starting net 9 @ 34 sec
./evil_ifconfig.sh: starting net 10 @ 38 sec
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./evil_ifconfig.sh: starting net 12 @ 46 sec
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./evil_ifconfig.sh: starting net 19 @ 71 sec
./evil_ifconfig.sh: starting net 20 @ 75 sec
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./evil_ifconfig.sh: starting net 27 @ 99 sec
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./evil_ifconfig.sh: starting net 235 @ 412 sec
./evil_ifconfig.sh: starting net 236 @ 413 sec
./evil_ifconfig.sh: starting net 237 @ 413 sec
./evil_ifconfig.sh: starting net 238 @ 413 sec
./evil_ifconfig.sh: starting net 239 @ 413 sec
./evil_ifconfig.sh: starting net 240 @ 413 sec
./evil_ifconfig.sh: starting net 241 @ 414 sec
./evil_ifconfig.sh: starting net 242 @ 414 sec
./evil_ifconfig.sh: starting net 243 @ 414 sec
./evil_ifconfig.sh: starting net 244 @ 414 sec
./evil_ifconfig.sh: starting net 245 @ 415 sec
./evil_ifconfig.sh: starting net 246 @ 415 sec
./evil_ifconfig.sh: starting net 247 @ 415 sec
./evil_ifconfig.sh: starting net 248 @ 415 sec
./evil_ifconfig.sh: starting net 249 @ 415 sec
./evil_ifconfig.sh: starting net 250 @ 416 sec
./evil_ifconfig.sh: starting net 251 @ 416 sec
./evil_ifconfig.sh: starting net 252 @ 416 sec
./evil_ifconfig.sh: starting net 253 @ 416 sec
./evil_ifconfig.sh: starting net 254 @ 416 sec
./evil_ifconfig.sh: starting net 255 @ 417 sec
./evil_ifconfig.sh 21,84s user 392,17s system 99% cpu 6:56,71 total
--
WBR, Vadim Goncharov. ICQ#166852181 mailto:vadim_nuclight@mail.ru
[Moderator of RU.ANTI-ECOLOGY][FreeBSD][http://antigreen.org][LJ:/nuclight]
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