Messages in this thread |  | | From | lists@frednet ... | Date | Tue, 26 Sep 2000 18:37:03 -0500 | Subject | Re: [Demo program]: Poor elevator performance in 2.4.0-test9pre6 |
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On Mon, Sep 25, 2000 at 04:00:51PM +0200, Jens Axboe wrote: > 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.
I doubt this has any relevance whatsoever, but when I try this on a 2.2.16 kernel running on top of a Pentium Pro 200 w/96megs of mem w/ a SCSI 2 disk, I get some funny numbers:
matt@zeus:~/cwork/personal$ ./elv_test 8 30 files created, 240 megs written at 4.32 megs/sec finished writing 240 megs written at 1794.23 megs per sec finished reading, 240 megs read at 1675.813817 megs/sec
Any ideas why I would be getting these numbers? - 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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