Date: Tue, 10 Feb 2009 15:44:33 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-performance@freebsd.org Subject: Re: FreeBSD 7.1 disk performance issue on ESXi 3.5 Message-ID: <gms3sl$ctv$1@ger.gmane.org> In-Reply-To: <49918E0A.1060500@sebster.com> References: <499165F3.6050803@sebster.com> <gms1i4$3vq$1@ger.gmane.org> <49918DA6.4020608@sebster.com> <49918E0A.1060500@sebster.com>
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Sebastiaan van Erk wrote:
> Sebastiaan van Erk wrote:
>> (However, just to give you an idea I attached the basic 5.1.2
>> unixbench outputs (the CPU info for FreeBSD is "fake", since unixbench=
>> does a cat /proc/cpuinfo, so I removed the /proc/ part and copied the
>> output under linux to the "procinfo" file.)
System: test-fbsd.vpn1.sebster.com: FreeBSD
------------------------------------------------------------------------
Benchmark Run: Tue Feb 10 2009 06:25:49 - 06:54:08
2 CPUs in system; running 1 parallel copy of tests
System Benchmarks Index Values BASELINE RESULT IND=
EX
Dhrystone 2 using register variables 116700.0 14144383.9 1212=
=2E0
Double-Precision Whetstone 55.0 3238.7 588=
=2E9
Execl Throughput 43.0 630.0 146=
=2E5
File Copy 1024 bufsize 2000 maxblocks 3960.0 28793.2 72=
=2E7
File Copy 256 bufsize 500 maxblocks 1655.0 33410.0 201=
=2E9
File Copy 4096 bufsize 8000 maxblocks 5800.0 33536.8 57=
=2E8
Pipe Throughput 12440.0 1146784.7 921=
=2E9
Pipe-based Context Switching 4000.0 36203.6 90=
=2E5
Process Creation 126.0 783.3 62=
=2E2
Shell Scripts (1 concurrent) 42.4 645.1 152=
=2E2
Shell Scripts (8 concurrent) 6.0 115.4 192=
=2E3
System Call Overhead 15000.0 939647.5 626=
=2E4
=3D=3D=
=3D=3D=3D=3D=3D=3D
System Benchmarks Index Score 212=
=2E4
System: test-ubuntu: GNU/Linux
------------------------------------------------------------------------
Benchmark Run: Mon Feb 09 2009 15:15:06 - 15:43:20
2 CPUs in system; running 1 parallel copy of tests
System Benchmarks Index Values BASELINE RESULT IND=
EX
Dhrystone 2 using register variables 116700.0 18610575.3 1594=
=2E7
Double-Precision Whetstone 55.0 2990.1 543=
=2E7
Execl Throughput 43.0 1058.6 246=
=2E2
File Copy 1024 bufsize 2000 maxblocks 3960.0 468973.2 1184=
=2E3
File Copy 256 bufsize 500 maxblocks 1655.0 132022.2 797=
=2E7
File Copy 4096 bufsize 8000 maxblocks 5800.0 921448.5 1588=
=2E7
Pipe Throughput 12440.0 1132933.6 910=
=2E7
Pipe-based Context Switching 4000.0 93429.0 233=
=2E6
Process Creation 126.0 1744.3 138=
=2E4
Shell Scripts (1 concurrent) 42.4 2566.9 605=
=2E4
Shell Scripts (8 concurrent) 6.0 518.4 864=
=2E0
System Call Overhead 15000.0 1935577.0 1290=
=2E4
=3D=3D=
=3D=3D=3D=3D=3D=3D
System Benchmarks Index Score 656=
=2E1
The results are ... interesting. It seems that FreeBSD simply dies in
any test having a high context switch rate. Hmmm, this looks familiar.
Either I or a collegue of mine had a similar situation some time ago,
with the same discrepancy in disk speeds and the same difference in
context switches. Unfortunately, there was no solution.
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