Re: slow raid5 performance kernel 2.6 vs 2.4

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Is there any news about this problem ?


On Tue, 14 Dec 2004, Neil Brown wrote:

On Sunday December 12, ddx@xxxxxxxxx wrote:
Hi,

system :

P4 2.4GHz HT, 1GB DDR
8*  S-ATA 250GB Hitachi on 2 Si3114 controllers

bonnie performance with 2.4 :
block input 126MB/sec

with 2.6 :
block input 90MB/sec

saw another posting about slow read performance with raid5 and 2.6
any ideas yet how to fix this ?


Not yet. I've been doing some testing which you can read about at http://neilb.web.cse.unsw.edu.au/~neilb/01102979338

I only get a drop from about 250 to 220 on my hardware, which still
isn't good.
I've got a few ideas but I'm not sure when I will have a chance to
follow through with them.  I'm doing a bit more testing first to make
sure I have a complete picture.

NeilBrown


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