Messages in this thread | | | From | Paolo Ornati <> | Subject | Re: 2.6.1-rc1 [resend] | Date | Wed, 31 Dec 2003 19:03:56 +0100 |
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On Wednesday 31 December 2003 17:31, Ed Sweetman wrote: > Paolo Ornati wrote: > > On Wednesday 31 December 2003 16:20, you wrote: > >>On Wednesday 31 December 2003 16:06, you wrote: > >>>>What io scheduler are you using? Or, could you post /var/log/dmesg? > >> > >>On Wed, Dec 31, 2003 at 04:19:27PM +0100, Paolo Ornati wrote: > >>>"dmesg" and "config" attached. > >> > >>Could you try this with elevator=deadline? > > > > ok, I have just tried... > > I don't see any big difference. > > Wasn't it mentioned in another thread related to a drop in ide > performance that there is possibly some bug in the ide code that ends up > requiring you to set the readahead on all your devices to see the max > performance of any one? > > set all the readaheads of all your ide devices to 8192 You should see > the best peformance doing this.
No, I have just try it but I don't see any changes.
My question is about a strange change of "behaviour" in IDE performance changing readahead.
Here I report a new thing that I've noticed today:
Kernel 2.6.0:
o readahead up to 224: when I run "hdparm -t /dev/hda" the HD LED light up... and after a while light down
o readahead > 224: running "hdparm" the HD LED starts blinking... and then light down
The best performance are riched with values between 128 and 224 --> IOW when the HD led starts blinking the performance diminish...
Kernel 2.6.1-rc1:
the HD LED starts to blink with readahead = 16 !!! Why?
BYE
-- Paolo Ornati Linux v2.6.0
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