network performance

Stefan Lambrev stefan.lambrev at
Wed Feb 6 05:29:32 PST 2008


Kris Kennaway wrote:
> Yes, it is gone with 8.0.  Disable the module builds because some of 
> them like this one probably need compile fixes.  If you need a subset 
> of modules use MODULES_OVERRIDE=list (in /etc/make.conf)
Yes, kernel builds.
I'm still playing with it, but the first results shows that new kernel 
can handle 800k incoming packets (well may be more but I have not enough 
power right now to generate more packets).
It still answer only to 250K-260K. I guess I'm hitting the limitation of 
syncache/syncookies ?
Anyway this netisr2 looks like huge improvement :)

I can't build kernel without option LOCK_PROFILING with your sources:

CC="cc" xargs mkdep -a -f .newdep -O2 -frename-registers -pipe 
-fno-strict-aliasing -march=nocona -std=c99 -g -Wall -Wredundant-decls 
-Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes 
-Wpointer-arith -Winline -Wcast-qual  -Wundef -Wno-pointer-sign 
-fformat-extensions -nostdinc  -I. -I/usr/src/sys 
-I/usr/src/sys/contrib/altq -I/usr/src/sys/contrib/ipfilter 
-I/usr/src/sys/contrib/pf -I/usr/src/sys/dev/ath 
-I/usr/src/sys/contrib/ngatm -I/usr/src/sys/dev/twa 
-I/usr/src/sys/gnu/fs/xfs/FreeBSD/support -I/usr/src/sys/gnu/fs/xfs 
-D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h -fno-common 
-finline-limit=8000 --param inline-unit-growth=100 --param 
large-function-growth=1000  -mcmodel=kernel -mno-red-zone  -mfpmath=387 
-mno-sse -mno-sse2 -mno-mmx -mno-3dnow  -msoft-float 
-fno-asynchronous-unwind-tables -ffreestanding
In file included from /usr/src/sys/netinet/ip_output.c:47:
/usr/src/sys/sys/rwlock.h:153:2: error: #error LOCK_DEBUG not defined, 
include <sys/lock.h> before <sys/rwlock.h>
mkdep: compile failed
*** Error code 1

So I added #include <sys/lock.h>, rebuild kernel and tested again w/o 
LOCK_PROFILING, but results are the same.

I'll use again hwpmc and LOCK_PROFILING to see what's going on.
And will try the same benchmark on quad core processor as now numbers of 
cores/cpus matter :)


Best Wishes,
Stefan Lambrev
ICQ# 24134177

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