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SubjectRe: VM changes added to performance patches for 2.4.19
On Sat, 24 Aug 2002 wrote:

> With the patch against 2.4.19:
> Scheduler O(1), Preemptible, Low Latency
> I have now added two extra alternative patches that include
> either Rik's rmap (thanks Rik) or AA's vm changes (thanks to Nuno Monteiro for
> merging this)
> For the record, with the (very) brief usage of these two patches I found the
> rmap patch a little faster. This is very subjective and completely untested.
> Check them out here and tell me what you think(please read the FAQ):

I tried the 2.4.19-ck3-aa patch last night, and did a few informal tests
against my current production kernel, 2.4.19-ac4. Machine in Athlon
1400MHz, 1GB RAM, 20+30GB WD disks.

Kernel compile was about 7 sec faster with ck3-aa, 6:58 vs 7:05 (no -j

Then I did my nightly backup of a scanned documentation project, making a
CD image from the scans, currently ~570MB. I was on ck3-aa, and I said
"self, that seemed pretty fast!" So I rebooted cold and tried the mkisofs
with both kernels, twice each.

2.4.19-ac4 2.4.19-ck3-aa
mkisofs 570MB 2:05 1:14

It was repeatably 40% faster! More testing, and now I'll build a stock
2.4.19 kernel for additional testing, and pull that responsiveness
benchmark and try that, too.

Looks like a nice job overall, I'm putting it on a laptop tonight, which
may give a better idea of how fast, or not, it really is.

bill davidsen <>
CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

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