Messages in this thread | | | Date | Tue, 24 Sep 2002 23:03:50 -0700 | From | "Martin J. Bligh" <> | Subject | Re: 2.5.38-mm2 dbench $N times |
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>> Not sure. This is boot bay SCSI crud, but single-disk FC looks >> *worse* for no obvious reason. Multiple disk tests do much better >> (about matching the el-scruffo PC numbers above). > > dbench 16 on that sort of machine is a memory bandwidth test. > And a dcache lock exerciser. It basically doesn't touch the > disk. Something very bad is happening.
Does dbench have any sort of CPU locality between who read it into pagecache, and who read it out again? If not, you stand 7/8 chance of being on the wrong node, and getting 1/20 of the mem bandwidth ....
M.
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