Messages in this thread | | | Date | Tue, 24 Sep 2002 17:31:39 -0700 | From | Andrew Morton <> | Subject | Re: 2.5.38-mm2 dbench $N times |
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William Lee Irwin III wrote: > > William Lee Irwin III wrote: > >> Taken on 32x/32G NUMA-Q: > >> Throughput 67.3949 MB/sec (NB=84.2436 MB/sec 673.949 MBit/sec) 16 procs > >> dbench 16 11.72s user 122.21s system 422% cpu 31.733 total > > On Tue, Sep 24, 2002 at 10:47:30AM -0700, Andrew Morton wrote: > > Taken on 2x/0.8G el-scruffo PC: > > Throughput 135.02 MB/sec (NB=168.775 MB/sec 1350.2 MBit/sec) > > ./dbench 16 12.11s user 16.29s system 181% cpu 15.646 total > > What's up with that? > > 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.
Anton can get 3000 MByte/sec ;) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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