Messages in this thread |  | | Date | Mon, 25 Sep 2000 16:00:51 +0200 | From | Jens Axboe <> | Subject | Re: [Demo program]: Poor elevator performance in 2.4.0-test9pre6 |
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On Mon, Sep 25 2000, Robert Cohen wrote: > With kernel version 2.4.0-test9pre6 the results are as follows. > The test machine has 128 Megs of memory. The tests accesses 240 Megs of > files so that it can't fit in cache. > > If I run it with 8 files of size 30 Megs: > > [robert@test25 src]$ ./elv_test 8 30 > files created, 240 megs written at 8.96 megs/sec > finished writing 240 megs written at 1.05 megs per sec <<<<<< > finished reading, 240 megs read at 5.848833 megs/sec > > If I do the same with a single file of size 240 Megs > > [robert@test25 src]$ ./elv_test 1 240 > files created, 240 megs written at 11.12 megs/sec > finished writing 240 megs written at 11.08 megs per sec > finished reading, 240 megs read at 12.580521 megs/sec
axboe@burns:/opt/software/testing > ./elv_test 8 30 files created, 240 megs written at 21.64 megs/sec finished writing 240 megs written at 21.12 megs per sec
This is my current tree on 2.4.0-test9-pre5. Thanks for the test program, Andrea and I are working on getting a polished patch ready for inclusion that (apparently) also fixes this problem.
-- * Jens Axboe <axboe@suse.de> * SuSE Labs - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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