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Date: Fri, 30 Jan 2009 19:19:18 +0000
From: Ulf Lilleengen <ulf.lilleengen@gmail.com>
To: Eric Anderson <anderson@freebsd.org>
Message-ID: <20090130191918.GC1275@carrot.BalPol.Local>
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Cc: freebsd-geom@freebsd.org
Subject: Re: Performance numbers?
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On Fri, Jan 30, 2009 at 07:18:18PM +0000, Ulf Lilleengen wrote:
> On Fri, Jan 30, 2009 at 10:40:46AM -0600, Eric Anderson wrote:
> > Hi GEOMers!
> > 
> > Does anyone have any benchmarks or numbers relating to GEOM performance?
> > 
> > I tried doing some on my own, but I didn't get very satisfactory  
> > results, so I'm curious what others have seen or used.
> > 
> > My hardware is a Core 2 Quad, with 4GB of ram.
> > 
> > First, I made an mdconfig'ed malloc backed 'disk' of 1.5GB.  Then, I  
> > tried running such tools as rawio, and diskinfo.  rawio fails with  
> > input/output errors, and diskinfo wants a larger device to give the  
> > full stats.  I ended up using purely dd since that worked.   
> > Interestingly enough, dd'ing to the malloc device results in about  
> > 1000 operations per second, regardless of a blocksize of 512bytes or  
> > 1MB.
> > 
> > Do you all expect this 1000 operations per second to be limited by the  
> > mdconfig'ed device, GEOM, both, all, none, ??  I'm looking for  
> > pointers here mostly.  I really would like to see how many operations  
> > (512byte really) the GEOM infrastructure can do on a particular piece  
> > of hardware, so if there is a simpler way to do this test, give me a  
> > hint.  :)
> > 
> Maybe try dtrace to find bottlenecks etc?
> 
Blah, sorry for the broken reply-to.
-- 
Ulf Lilleengen