Date: Fri, 30 Jan 2009 10:40:46 -0600 From: Eric Anderson <anderson@freebsd.org> To: freebsd-geom@freebsd.org Subject: Performance numbers? Message-ID: <6612C205-C346-4493-9DA4-3B5A73E9A4F7@freebsd.org>
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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. :) Thanks! Eric
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