Messages in this thread |  | | Date | Thu, 28 Dec 2000 16:49:14 +0100 | From | Daniel Phillips <> | Subject | Re: [RFC] changes to buffer.c (was Test12 ll_rw_block error) |
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Chris Mason wrote: > > On Wednesday, December 27, 2000 21:26:02 +0100 Daniel Phillips > <phillips@innominate.de> wrote: > > > Hi Chris. I took your patch for a test drive under dbench and it seems > > impressively stable under load, but there are performance problems. > > > > Test machine: 64 meg, 500 Mhz K6, IDE, Ext2, Blocksize=4K > > Without patch: 9.5 MB/sec, 11 min 6 secs > > With patch: 3.12 MB/sec, 33 min 51 sec > > > > Cool, thanks for the testing. Which benchmark are you using? bonnie and > dbench don't show any changes on my scsi disks, I'll give IDE a try as well.
Chris, this was an error, I had accidently booted the wrong kernel. The 'With patch' results above are for 2.2.16, not your patch.
With correct results you are looking much better:
Test machine: 64 meg, 500 Mhz K6, IDE, Ext2, Blocksize=4K Test: dbench 48
pre13 without patch: 9.5 MB/sec 11 min 6 secs pre13 with patch: 8.9 MB/sec 11 min 46 secs 2.2.16: 3.1 MB/sec 33 min 51 sec
This benchmark doesn't seem to suffer a lot from noise, so the 7% slowdown with your patch likely real.
We've come a long way from 2.2.16, haven't we? I'll run some of these tests against 2.2 pre19 kernels and maybe fan the flames of the 2.2/2.4 competition a little.
-- Daniel - 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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