Date: Tue, 27 May 2008 16:38:19 +0900 From: "Hattori, Shigehiro" <s.hattori@scs.co.jp> To: <freebsd-questions@freebsd.org> Subject: FreeBSD 7.0-RELEASE: Can I specify the maximum number of cores that kernel can recognize ? Message-ID: <011501c8bfcc$a3164b40$c154140a@colors.scs.co.jp>
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Hi,
I try to measure Bind caching name server's multi threading performance on
FreeBSD 7 , like below.
--
# of cores query/second
1 xx
2 xx
4 xx
6 xx
8 xx
--
My testing machine has 8 cores. ( quad core * 2 )
I'd like to specify the maximum # of cores that kernel can recognize.
Can I specify the maximum # of cores with boot parameters or something ?
I've already done Bind multi threading performance test on Linux ( CentOS5 )
In case of CentOS5 , I specified maximum # of cores with grub.conf "maxcpus=1
or 2 or 4 or ..."
# cat /etc/grub.conf
title CentOS (2.6.18-53.1.21.el5PAE)
root (hd0,1)
kernel /boot/vmlinuz-2.6.18-53.1.21.el5PAE ro root=LABEL=/ rhgb
quiet maxcpus=6
initrd /boot/initrd-2.6.18-53.1.21.el5PAE.img
#
The following is the results I did on CentOS5 ( kernel:
2.6.18-53.1.21.el5 ).
-- Bind 9.4.2 caching name server on CentOS5
# of cores query/second CPU ( named )
1 3578 99.9
2 5070 196
4 6608 362
6 9042 527
8 10552 678
--
- Bind's machine spec
CPU: Intel Xeon E5346 2.3GH ( quad core * 2 )
Memory: 4GB
Bind 9.4.2
Cache size: 1400MB
Max recursive clients: 50000
- Traffic generetor: queryperf
Query list: all queries are uniq ( that means "No answer in the cache" )
Best regards,
Shigehiro
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