Re: Strange IDE performance change in 2.6.1-rc1 (again)

[Paolo Ornati]

On Friday 02 January 2004 23:34, you wrote:
> On Fri, 2004-01-02 at 22:32, Mike Fedyk wrote:
> > Have there been any ide updates in 2.6.1-rc1?
>
> I see that a readahead patch was applied just before -rc1 was released.
>
> found it in bk-commits-head
>
> Subject: [PATCH] readahead: multiple performance fixes
> Message-Id:  <200312310120.hBV1KLZN012971@xxxxxxxxxxxxxxx>
>
> Maybe Paolo can try backing it out.

YES, YES, YES...

Reveting "readahead: multiple performance fixes" patch performance came back 
like in 2.6.0.

2.6.0:
64        31.91
128      31.89
256      26.22
8192    26.26

2.6.1-rc1 (readahead patch reverted):
64	31.84
128	31.86
256	25.93
8192	26.16

I know these are only performance in sequential data reads... and real life 
is another thing... but I think the author of the patch should be informed 
(Ram Pai).

for Ram Pai:
_____________________________________________________________________
My first message:
http://www.ussg.iu.edu/hypermail/linux/kernel/0401.0/0004.html

This thread:
Strange IDE performance change in 2.6.1-rc1 (again)
http://www.ussg.iu.edu/hypermail/linux/kernel/0401.0/0289.html
(look at the graph)

Any comments?
_____________________________________________________________________

Bye

-- 
	Paolo Ornati
	Linux v2.4.23

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