Date: Mon, 9 May 2005 14:26:37 -0400 (EDT) From: "Mike Jakubik" <mikej@rogers.com> To: "Scott Long" <scottl@samsco.org> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: Performance issue Message-ID: <1059.172.16.0.199.1115663197.squirrel@172.16.0.1> In-Reply-To: <427F9890.7010104@samsco.org> References: <20050509150018.GF281@mathcode.net> <427F8076.7030105@samsco.org> <20050509170316.GG281@mathcode.net> <427F9890.7010104@samsco.org>
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On Mon, May 9, 2005 1:06 pm, Scott Long said:
> 5.3 ships with SMP turned on, which makes lock operations rather
> expensive on single-processor machines. 4.x does not have SMP turned on by
> default. Would you be able to re-run your test with SMP turned off?
This is what i get on my system, which has debugging and smp off in the
kernel.
FreeBSD 6.0-CURRENT #0: Tue May 3 23:55:43 EDT 2005
root@fbsd.wettoast.net:/usr/obj/usr/src/sys/DP
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Athlon(tm) Processor (1410.21-MHz 686-class CPU)
Origin = "AuthenticAMD" Id = 0x644 Stepping = 4
Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR>
AMD Features=0xc0440000<RSVD,AMIE,DSP,3DNow!>
---
76.89 real 49.33 user 22.87 sys
23116 maximum resident set size
686 average shared memory size
20795 average unshared data size
127 average unshared stack size
5380 page reclaims
0 page faults
0 swaps
0 block input operations
0 block output operations
0 messages sent
0 messages received
0 signals received
1 voluntary context switches
10018 involuntary context switches
---
As we can see, it is still spending a lot of time in system, and there are
a lot of context switches being done.
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