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Date: Fri, 14 Sep 2007 14:52:10 -0700
From: Andrew Sharp <andy.sharp@onstor.com>
To: "Fay Chong" <fay.chong@onstor.com>
Cc: "Eric Barrett" <eric.barrett@onstor.com>, "Maxim Kozlovsky"
 <maxim.kozlovsky@onstor.com>, "Jonathan Goldick"
 <jonathan.goldick@onstor.com>, "Paul Hammer" <paul.hammer@onstor.com>,
 "Brian Montero" <brian.montero@onstor.com>, "John Rogers"
 <john.rogers@onstor.com>, "Brian Baker" <brian.baker@onstor.com>, "Brian
 DeForest" <brian.deforest@onstor.com>, "Fay Chong" <fay.chong@onstor.com>
Subject: Re: comparison of dd write on FreeBSD 6.2, FreeBSD 4.11, Red Hat
 Enterprise Linux 3
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On Fri, 14 Sep 2007 12:06:55 -0700 "Fay Chong" <fay.chong@onstor.com>
wrote:

> Hi,
> Here is the dd statement:
> dd if=/dev/zero of=/mnt/vol1/iobw.tst bs=128m count=400
> 
> Looking at vsvr stat agg the bandwidths were:
> 
> FreeBSD 6.2			15-16MB/sec
> FreeBSD 4.11  			35-36MB/sec
> Red Hat Enterprise Linux 3	64-65MB/sec

Good lord, do you know how old RHEL3 is?  How about any Linux with a
2.6.22.3 or above kernel instead.  Oops, I mean, in addition to.  It
looks like rhel3 might be a good data point to compare against later
kernels.  I would also throw in Debian/Stable(etch) and the latest
release of SuSe.  I can produce kernels for you if you wish.

Quite frankly, on an otherwise quiescent filer, I would expect
slightly higher numbers, at least from a decently configured machine.
Maybe as high as 75MB/s.

> Yahoo specifies FreeBSD 4.11 or 6. FreeBSD 4.11 is being installed on
> two clients for Yahoo testing.
> 
> Comments, suggestions, questions welcome.
> 
> Thanks
> Fay
> 
> 
> Fay Chong
> Sr. Performance Engineer
> ONStor, Inc.
> fay.chong@onstor.com
> 408.376.3130 (w)
> 
> 
