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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[-- Attachment #1 --]
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 INDEX
Dhrystone 2 using register variables 116700.0 14144383.9 1212.0
Double-Precision Whetstone 55.0 3238.7 588.9
Execl Throughput 43.0 630.0 146.5
File Copy 1024 bufsize 2000 maxblocks 3960.0 28793.2 72.7
File Copy 256 bufsize 500 maxblocks 1655.0 33410.0 201.9
File Copy 4096 bufsize 8000 maxblocks 5800.0 33536.8 57.8
Pipe Throughput 12440.0 1146784.7 921.9
Pipe-based Context Switching 4000.0 36203.6 90.5
Process Creation 126.0 783.3 62.2
Shell Scripts (1 concurrent) 42.4 645.1 152.2
Shell Scripts (8 concurrent) 6.0 115.4 192.3
System Call Overhead 15000.0 939647.5 626.4
========
System Benchmarks Index Score 212.4
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 INDEX
Dhrystone 2 using register variables 116700.0 18610575.3 1594.7
Double-Precision Whetstone 55.0 2990.1 543.7
Execl Throughput 43.0 1058.6 246.2
File Copy 1024 bufsize 2000 maxblocks 3960.0 468973.2 1184.3
File Copy 256 bufsize 500 maxblocks 1655.0 132022.2 797.7
File Copy 4096 bufsize 8000 maxblocks 5800.0 921448.5 1588.7
Pipe Throughput 12440.0 1132933.6 910.7
Pipe-based Context Switching 4000.0 93429.0 233.6
Process Creation 126.0 1744.3 138.4
Shell Scripts (1 concurrent) 42.4 2566.9 605.4
Shell Scripts (8 concurrent) 6.0 518.4 864.0
System Call Overhead 15000.0 1935577.0 1290.4
========
System Benchmarks Index Score 656.1
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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