Date: Fri, 30 Jan 2009 19:18:18 +0000 From: Ulf Lilleengen <ulf.lilleengen@gmail.com> To: Eric Anderson <anderson@freebsd.org> Cc: freebsd-geom@freebsd.org Subject: Re: Performance numbers? Message-ID: <20090130191818.GB1275@carrot.BalPol.Local> In-Reply-To: <6612C205-C346-4493-9DA4-3B5A73E9A4F7@freebsd.org> References: <6612C205-C346-4493-9DA4-3B5A73E9A4F7@freebsd.org>
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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? -- Ulf Lilleengen
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